GRADING SYSTEM с использованием JComboBox для ввода оценок;Jlabel, JTextFirld, JFrame;JButton для событий;все в JFrame - PullRequest
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GRADING SYSTEM с использованием JComboBox для ввода оценок;Jlabel, JTextFirld, JFrame;JButton для событий;все в JFrame

0 голосов
/ 09 октября 2011

вот мой код для наших финалов.система оценок, где все оценки находятся в 24 JComboBox.некоторые с числами до 10, 20 и 30. каждый квартал они вычисляются и показываются в JTextfield.По завершении четырех четвертей Jbutton «COMPUTE ALL» вычисляет все данные и отображает в другом кадре оценку ученика и погоду, которую он или она прошли или потерпели неудачу.этот код хорошо работает с некоторыми проблемами: (1) моя кнопка «CLEAR ALL» не работает.он должен показывать номер по умолчанию «0» при щелчке, а поля Jtext должны быть пустыми - (ЭТО УЖЕ РАБОТАЕТ «TEXTFIELD TO EMPTY». (2) Я хочу скрыть второй кадр, когда нажата кнопка J для вычисления всех (f2.hide(); f3.show ();), но он продолжает говорить (не может найти символ символа: переменная f2 не может найти символ) (3) и, наконец, в моем 3-м кадре, где показаны итоговая оценка и итоговый рейтинг учащегося, я не могу его показатьв диалоговом окне сообщения с указанием погоды он или она прошли или не смогли. СПАСИБО. извините за плохое кодирование. 

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;

public class forfinals extends JFrame{

     JFrame f1 = new JFrame ("HELLO");



     JLabel Lb1 = new JLabel ("Enter your name");
     JLabel Lb2 = new JLabel ("QUIZZES (20)");
     JLabel Lb3 = new JLabel ("ASSIGNMENTS (10)");
     JLabel Lb4 = new JLabel ("PROJECTS (20)");
     JLabel Lb5 = new JLabel ("PARTICIPATION (10)");
     JLabel Lb6 = new JLabel ("ATTENDANCE(10)");
     JLabel Lb7 = new JLabel ("MAJOR EXAM (30)");
     JLabel Lb8 = new JLabel ("Western College SY: 2011-2012");
     JLabel Lb9 = new JLabel ("Final Grade");
     JLabel Lb10 = new JLabel ("PRELIM");
     JLabel Lb11 = new JLabel ("MIDTERM");
     JLabel Lb12 = new JLabel ("PREFINAL");
     JLabel Lb13 = new JLabel ("FINALS");
     JLabel label1 = new JLabel ("YOUR FINAL GRADE");
     JLabel label2 = new JLabel ("YOU EARNED THE RATING");

     JTextField txt1 = new JTextField (15);
     JTextField txt2 = new JTextField (2);
     JTextField txt3 = new JTextField (2);
     JTextField txt4 = new JTextField (2);
     JTextField txt5 = new JTextField (2);
     JTextField finalg = new JTextField (5);
     JTextField finalr = new JTextField (5);

     JButton Btn1 = new JButton ("OK");
     JButton Btn2 = new JButton ("CANCEL");
     JButton Btn3 = new JButton ("COMPUTE");
     JButton Btn4 = new JButton ("COMPUTE");
     JButton Btn5 = new JButton ("COMPUTE");
     JButton Btn6 = new JButton ("COMPUTE");
     JButton jcompute = new JButton ("COMPUTE ALL");
     JButton jclear = new JButton ("CLEAR ALL");
     JButton jexit = new JButton ("EXIT");
     JButton finalb = new JButton ("OK");

     //prelim
     JComboBox cb1 = new JComboBox();
     JComboBox cb2 = new JComboBox();
     JComboBox cb3 = new JComboBox();
     JComboBox cb4 = new JComboBox();
     JComboBox cb5 = new JComboBox();
     JComboBox cb6 = new JComboBox();
            //midterm
            JComboBox cb7 = new JComboBox();
            JComboBox cb8 = new JComboBox();
            JComboBox cb9 = new JComboBox();
            JComboBox cb10 = new JComboBox();
            JComboBox cb11 = new JComboBox();
            JComboBox cb12 = new JComboBox();
                    //prefinal
                    JComboBox cb13 = new JComboBox();
                    JComboBox cb14 = new JComboBox();
                    JComboBox cb15 = new JComboBox();
                    JComboBox cb16 = new JComboBox();
                    JComboBox cb17 = new JComboBox();
                    JComboBox cb18 = new JComboBox();
                            //finals
                            JComboBox cb19 = new JComboBox();
                            JComboBox cb20 = new JComboBox();
                            JComboBox cb21 = new JComboBox();
                            JComboBox cb22 = new JComboBox();
                            JComboBox cb23 = new JComboBox();
                            JComboBox cb24 = new JComboBox();


public forfinals(){

    f1.getContentPane().setLayout(null);
    f1.setSize (300,350);
    f1.getContentPane().add(Lb1);
    f1.getContentPane().add(txt1);
    f1.getContentPane().add(Btn1);
    f1.getContentPane().add(Btn2);
    Lb1.setBounds(40,70,100,75);
    txt1.setBounds(150,90,100,30);
    Btn1.setBounds(40,170,100,40);
    Btn2.setBounds(150,170,100,40);


    Btn1.addActionListener(new ActionListener(){
        public void actionPerformed (ActionEvent e){

            String x;
            x = txt1.getText();
            JFrame f2 = new JFrame (x);
            f2.getContentPane().setLayout(null);
            f2.setSize (830,600);

                f1.hide(); 
                f2.show();  

                    f2.getContentPane().add(Lb2);
                    f2.getContentPane().add(Lb3);
                    f2.getContentPane().add(Lb4);
                    f2.getContentPane().add(Lb5);
                    f2.getContentPane().add(Lb6);
                    f2.getContentPane().add(Lb7);
                    f2.getContentPane().add(Lb8);
                    f2.getContentPane().add(Lb9);
                    f2.getContentPane().add(Lb10);
                    f2.getContentPane().add(Lb11);
                    f2.getContentPane().add(Lb12);
                    f2.getContentPane().add(Lb13);
                    f2.getContentPane().add(jcompute);
                    f2.getContentPane().add(jclear);
                    f2.getContentPane().add(jexit);

                        Lb2.setBounds(30,120,90,70);
                        Lb3.setBounds(30,170,110,70);
                        Lb4.setBounds(30,220,90,70);
                        Lb5.setBounds(30,270,120,70);
                        Lb6.setBounds(30,320,100,70);
                        Lb7.setBounds(30,370,110,70);
                        Lb8.setBounds(280,20,230,20);
                        Lb9.setBounds(30,420,80,70);
                        Lb10.setBounds(190,60,100,100);
                        Lb11.setBounds(315,60,100,100);
                        Lb12.setBounds(440,60,100,100);
                        Lb13.setBounds(570,60,100,100);
                        jcompute.setBounds(660,160,120, 60);
                        jclear.setBounds(660,260,120, 60);
                        jexit.setBounds(660,360,120,60);

//PRELIM

    f2.getContentPane().add(cb1); 
    f2.getContentPane().add(cb2);
    f2.getContentPane().add(cb3);
    f2.getContentPane().add(cb4);
    f2.getContentPane().add(cb5);
    f2.getContentPane().add(cb6);
    f2.getContentPane().add(Btn3);
    f2.getContentPane().add(txt2); 
    txt2.setEditable(false);
            cb1.setBounds(190,140,50,30);
            cb2.setBounds(190,190,50,30);
            cb3.setBounds(190,240,50,30);
            cb4.setBounds(190,290,50,30);
            cb5.setBounds(190,340,50,30);
            cb6.setBounds(190,390,50,30);
            Btn3.setBounds(170,490,95,40);
            txt2.setBounds(190,440,55,35);

        int numbers_to_add_max = 10;
            for (int i = 0; i <= numbers_to_add_max; i++) {
                cb2.addItem(new Integer(i));        
                cb4.addItem(new Integer(i));
                cb5.addItem(new Integer(i));
        }

                        int numbers = 20;
                            for (int i = 0; i <= numbers; i++) {
                                cb1.addItem(new Integer(i));        
                                cb3.addItem(new Integer(i));

                        }   

                                    int numbers_to_add = 30;
                                        for (int i = 0; i <= numbers_to_add; i++) {
                                            cb6.addItem(new Integer(i));
                                    }


//MIDTERM

    f2.getContentPane().add(cb7); 
    f2.getContentPane().add(cb8);
    f2.getContentPane().add(cb9);
    f2.getContentPane().add(cb10);
    f2.getContentPane().add(cb11);
    f2.getContentPane().add(cb12);              
    f2.getContentPane().add(Btn4);
    f2.getContentPane().add(txt3); 
    txt3.setEditable(false);
            cb7.setBounds(315,140,50,30);
            cb8.setBounds(315,190,50,30);
            cb9.setBounds(315,240,50,30);
            cb10.setBounds(315,290,50,30);
            cb11.setBounds(315,340,50,30);
            cb12.setBounds(315,390,50,30);
            Btn4.setBounds(295,490,95,40);
            txt3.setBounds(315,440,55,35);

        int nu = 10;
                for (int i = 0; i <= nu; i++) {
                    cb8.addItem(new Integer(i));        
                    cb10.addItem(new Integer(i));
                    cb11.addItem(new Integer(i));
            }

                        int num = 20;
                            for (int i = 0; i <= num; i++) {
                                cb7.addItem(new Integer(i));        
                                cb9.addItem(new Integer(i));

                        }   

                                    int numb = 30;
                                        for (int i = 0; i <= numb; i++) {
                                            cb12.addItem(new Integer(i));
                                    }

//PREFINAL

    f2.getContentPane().add(cb13); 
    f2.getContentPane().add(cb14);
    f2.getContentPane().add(cb15);
    f2.getContentPane().add(cb16);
    f2.getContentPane().add(cb17);
    f2.getContentPane().add(cb18);
    f2.getContentPane().add(Btn5);
    f2.getContentPane().add(txt4); 
    txt4.setEditable(false);
            cb13.setBounds(440,140,50,30);
            cb14.setBounds(440,190,50,30);
            cb15.setBounds(440,240,50,30);
            cb16.setBounds(440,290,50,30);
            cb17.setBounds(440,340,50,30);
            cb18.setBounds(440,390,50,30);
            Btn5.setBounds(420,490,95,40);
            txt4.setBounds(440,440,55,35);

        int toaddmax = 10;
            for (int i = 0; i <= toaddmax; i++) {
                cb14.addItem(new Integer(i));       
                cb16.addItem(new Integer(i));
                cb17.addItem(new Integer(i));
        }

                        int numbersadd = 20;
                            for (int i = 0; i <= numbersadd; i++) {
                                cb13.addItem(new Integer(i));       
                                cb15.addItem(new Integer(i));

                        }   

                                    int numbers_toadd = 30;
                                        for (int i = 0; i <= numbers_toadd; i++) {
                                            cb18.addItem(new Integer(i));
                                    }


//FINALS

    f2.getContentPane().add(cb19); 
    f2.getContentPane().add(cb20);
    f2.getContentPane().add(cb21);
    f2.getContentPane().add(cb22);
    f2.getContentPane().add(cb23);
    f2.getContentPane().add(cb24);
    f2.getContentPane().add(Btn6);
    f2.getContentPane().add(txt5); 
    txt5.setEditable(false);
            cb19.setBounds(565,140,50,30);
            cb20.setBounds(565,190,50,30);
            cb21.setBounds(565,240,50,30);
            cb22.setBounds(565,290,50,30);
            cb23.setBounds(565,340,50,30);
            cb24.setBounds(565,390,50,30);
            Btn6.setBounds(545,490,95,40);
            txt5.setBounds(565,440,55,35);

        int add_max = 10;
            for (int i = 0; i <= add_max; i++) {
                cb20.addItem(new Integer(i));       
                cb22.addItem(new Integer(i));
                cb23.addItem(new Integer(i));
        }

                        int number = 20;
                            for (int i = 0; i <= number; i++) {
                                cb19.addItem(new Integer(i));       
                                cb21.addItem(new Integer(i));

                        }   

                                    int to_add = 30;
                                        for (int i = 0; i <= to_add; i++) {
                                            cb24.addItem(new Integer(i));
                                    }





        }
    });



        Btn2.addActionListener(new ActionListener(){
            public void actionPerformed (ActionEvent e){

                System.exit(0);

            }
        });


            Btn3.addActionListener(new ActionListener(){
                            public void actionPerformed (ActionEvent e){

                int cb1Int = Integer.parseInt(cb1.getSelectedItem().toString());
                int cb2Int = Integer.parseInt(cb2.getSelectedItem().toString());
                int cb3Int = Integer.parseInt(cb3.getSelectedItem().toString());
                int cb4Int = Integer.parseInt(cb4.getSelectedItem().toString());
                int cb5Int = Integer.parseInt(cb5.getSelectedItem().toString());
                int cb6Int = Integer.parseInt(cb6.getSelectedItem().toString());

                txt2.setText(String.valueOf(cb1Int + cb2Int + cb3Int + cb4Int + cb5Int + cb6Int));

            }
        });


                        Btn4.addActionListener(new ActionListener(){
                                    public void actionPerformed (ActionEvent e){

                            int cb7Int = Integer.parseInt(cb7.getSelectedItem().toString());
                            int cb8Int = Integer.parseInt(cb8.getSelectedItem().toString());
                            int cb9Int = Integer.parseInt(cb9.getSelectedItem().toString());
                            int cb10Int = Integer.parseInt(cb10.getSelectedItem().toString());
                            int cb11Int = Integer.parseInt(cb11.getSelectedItem().toString());
                            int cb12Int = Integer.parseInt(cb12.getSelectedItem().toString());

                            txt3.setText(String.valueOf(cb7Int + cb8Int + cb9Int + cb10Int + cb11Int + cb12Int));



                        }
                    });


                                    Btn5.addActionListener(new ActionListener(){
                                                public void actionPerformed (ActionEvent e){

                                        int cb13Int = Integer.parseInt(cb13.getSelectedItem().toString());
                                        int cb14Int = Integer.parseInt(cb14.getSelectedItem().toString());
                                        int cb15Int = Integer.parseInt(cb15.getSelectedItem().toString());
                                        int cb16Int = Integer.parseInt(cb16.getSelectedItem().toString());
                                        int cb17Int = Integer.parseInt(cb17.getSelectedItem().toString());
                                        int cb18Int = Integer.parseInt(cb18.getSelectedItem().toString());

                                        txt4.setText(String.valueOf(cb13Int + cb14Int + cb15Int + cb16Int + cb17Int + cb18Int));


                                }
                            });



                                                Btn6.addActionListener(new ActionListener(){
                                                            public void actionPerformed (ActionEvent e){

                                                    int cb19Int = Integer.parseInt(cb19.getSelectedItem().toString());
                                                    int cb20Int = Integer.parseInt(cb20.getSelectedItem().toString());
                                                    int cb21Int = Integer.parseInt(cb21.getSelectedItem().toString());
                                                    int cb22Int = Integer.parseInt(cb22.getSelectedItem().toString());
                                                    int cb23Int = Integer.parseInt(cb23.getSelectedItem().toString());
                                                    int cb24Int = Integer.parseInt(cb24.getSelectedItem().toString());

                                                    txt5.setText(String.valueOf(cb19Int + cb20Int + cb21Int + cb22Int + cb23Int + cb24Int));
                                            }
                                        });


    jcompute.addActionListener(new ActionListener(){
        public void actionPerformed (ActionEvent e){


            String prelim, midterm, prefinal, finals, total;
            double a, b, c, d, tg;

                prelim = txt2.getText();
                midterm = txt3.getText();
                prefinal = txt4.getText();
                finals = txt5.getText();

                    a = Double.parseDouble(prelim);
                    b = Double.parseDouble(midterm);
                    c = Double.parseDouble(prefinal);
                    d = Double.parseDouble(finals);

                        tg = (a + b + c + d)/4;                         
                            total = Double.toString(tg);
                            finalg.setText(total);

            JFrame f3 = new JFrame ("STUDENT  FINAL RATING");
            f3.getContentPane().setLayout(null);
            f3.setSize (350,300);

                                //the frame2 (f2); the two frames are still visible
                    f2.hide();
                    f3.show();

                    f3.getContentPane().add(label1);
                    f3.getContentPane().add(label2);
                    f3.getContentPane().add(finalg);
                    finalg.setEditable(false);
                    f3.getContentPane().add(finalr);
                    finalr.setEditable(false);
                    f3.getContentPane().add(finalb);

                        label1.setBounds(70,20,150,70);
                        label2.setBounds(90,70,200,70);
                        finalg.setBounds(205,40,50,30);
                        finalr.setBounds(140,140,50,40);
                        finalb.setBounds(130,200,70,30);

    //EQUIVALENT

    double grade, equiv;

    grade = Double.parseDouble(finalg.getText());

    if(grade>=99.50 && grade<101)
    equiv = 1.00;
    else if(grade<99.50 && grade>=98.50)
    equiv = 1.10;
    else if(grade<98.50 && grade>=97.50)
    equiv = 1.20;
    else if(grade<97.50 && grade>=96.50)
    equiv = 1.30;
    else if(grade<96.50 && grade>=95.50)
    equiv = 1.40;
    else if(grade<95.50 && grade>=94.50)
    equiv = 1.50;
    else if(grade<94.50 && grade>=93.50)
    equiv = 1.60;
    else if(grade<93.50 && grade>=92.50)
    equiv = 1.70;
    else if(grade<92.50 && grade>=91.50)
    equiv = 1.80;
    else if(grade<91.50 && grade>=90.50)
    equiv = 1.90;
    else if(grade<90.50 && grade>=89.50)
    equiv = 2.00;
    else if(grade<89.50 && grade>=88.50)
    equiv = 2.10;
    else if(grade<88.50 && grade>=87.50)
    equiv = 2.20;
    else if(grade<87.50 && grade>=86.50)
    equiv = 2.30;
    else if(grade<86.50 && grade>=85.50)
    equiv = 2.40;
    else if(grade<85.50 && grade>=84.50)
    equiv = 2.50;
    else if(grade<84.50 && grade>=83.50)
    equiv = 2.60;
    else if(grade<83.50 && grade>=82.50)
    equiv = 2.70;
    else if(grade<82.50 && grade>=81.50)
    equiv = 2.80;
    else if(grade<81.50 && grade>=80.50)
    equiv = 2.90;
    else if(grade<80.50 && grade>=79.50)
    equiv = 3.00;
    else if(grade<79.50 && grade>=78.50)
    equiv = 3.10;
    else if(grade<78.50 && grade>=77.50)
    equiv = 3.20;
    else if(grade<77.50 && grade>=76.50)
    equiv = 3.30;
    else if(grade<76.50 && grade>=75.50)
    equiv = 3.40;
    else if(grade<75.50 && grade>=74.50)
    equiv = 3.50;
    else
    equiv = 5.0;

    finalr.setText("" + equiv);
    finalr.setEditable(false);


    }
});

    finalb.addActionListener(new ActionListener(){
        public void actionPerformed(ActionEvent e){

JOptionPane.showMessageDialog (null, "" + эквивалента); if (equi> = 1.00 && эквивалента<= 3.0) JOptionPane.showMessageDialog (null, «ВЫ ПРОШЕЛ!»); 'Else if (экв>> = 3.10 && экв <= 75) JOptionPane.showMessageDialog (null, «ВАС НЕ УКАЗАНО!»);}}); </p> 

        jclear.addActionListener(new ActionListener(){
            public void actionPerformed (ActionEvent e){

// эта часть не работает.JComboBox по-прежнему содержит инициализированное число, даже если нажата кнопка «CLEAR ALL» cb1.setSelectedItem («0»);cb2.setSelectedItem ( "0");cb3.setSelectedItem ( "0");cb4.setSelectedItem ( "0");cb5.setSelectedItem ( "0");cb6.setSelectedItem ( "0");cb7.setSelectedItem ( "0");cb8.setSelectedItem ( "0");cb9.setSelectedItem ( "0");cb10.setSelectedItem ( "0");cb11.setSelectedItem ( "0");cb12.setSelectedItem ( "0");cb13.setSelectedItem ( "0");cb14.setSelectedItem ( "0");cb15.setSelectedItem ( "0");cb16.setSelectedItem ( "0");cb17.setSelectedItem ( "0");cb18.setSelectedItem ( "0");cb19.setSelectedItem ( "0");cb20.setSelectedItem ( "0");cb21.setSelectedItem ( "0");cb22.setSelectedItem ( "0");cb23.setSelectedItem ( "0");cb24.setSelectedItem ("0"); 

                txt2.setText(" ");
                txt3.setText(" ");
                txt4.setText(" ");
                txt5.setText(" ");          

            }
        });



                                    jexit.addActionListener(new ActionListener(){
                                            public void actionPerformed (ActionEvent e){

                                                        System.exit(0);

                                        }
                                    });



        f1.show();

}

    public static void main (String args []){
        forfinals xx = new forfinals(); 

            }
}

1 Ответ

0 голосов
/ 09 октября 2011

Вот полный исправленный код, 

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;

public class forfinals extends JFrame{

     JFrame f1 = new JFrame ("HELLO");
     JFrame f2 = new JFrame();
     double grade, equiv;


     JLabel Lb1 = new JLabel ("Enter your name");
     JLabel Lb2 = new JLabel ("QUIZZES (20)");
     JLabel Lb3 = new JLabel ("ASSIGNMENTS (10)");
     JLabel Lb4 = new JLabel ("PROJECTS (20)");
     JLabel Lb5 = new JLabel ("PARTICIPATION (10)");
     JLabel Lb6 = new JLabel ("ATTENDANCE(10)");
     JLabel Lb7 = new JLabel ("MAJOR EXAM (30)");
     JLabel Lb8 = new JLabel ("Western College SY: 2011-2012");
     JLabel Lb9 = new JLabel ("Final Grade");
     JLabel Lb10 = new JLabel ("PRELIM");
     JLabel Lb11 = new JLabel ("MIDTERM");
     JLabel Lb12 = new JLabel ("PREFINAL");
     JLabel Lb13 = new JLabel ("FINALS");
     JLabel label1 = new JLabel ("YOUR FINAL GRADE");
     JLabel label2 = new JLabel ("YOU EARNED THE RATING");

     JTextField txt1 = new JTextField (15);
     JTextField txt2 = new JTextField (2);
     JTextField txt3 = new JTextField (2);
     JTextField txt4 = new JTextField (2);
     JTextField txt5 = new JTextField (2);
     JTextField finalg = new JTextField (5);
     JTextField finalr = new JTextField (5);

     JButton Btn1 = new JButton ("OK");
     JButton Btn2 = new JButton ("CANCEL");
     JButton Btn3 = new JButton ("COMPUTE");
     JButton Btn4 = new JButton ("COMPUTE");
     JButton Btn5 = new JButton ("COMPUTE");
     JButton Btn6 = new JButton ("COMPUTE");
     JButton jcompute = new JButton ("COMPUTE ALL");
     JButton jclear = new JButton ("CLEAR ALL");
     JButton jexit = new JButton ("EXIT");
     JButton finalb = new JButton ("OK");

     //prelim
     JComboBox cb1 = new JComboBox();
     JComboBox cb2 = new JComboBox();
     JComboBox cb3 = new JComboBox();
     JComboBox cb4 = new JComboBox();
     JComboBox cb5 = new JComboBox();
     JComboBox cb6 = new JComboBox();
            //midterm
            JComboBox cb7 = new JComboBox();
            JComboBox cb8 = new JComboBox();
            JComboBox cb9 = new JComboBox();
            JComboBox cb10 = new JComboBox();
            JComboBox cb11 = new JComboBox();
            JComboBox cb12 = new JComboBox();
                    //prefinal
                    JComboBox cb13 = new JComboBox();
                    JComboBox cb14 = new JComboBox();
                    JComboBox cb15 = new JComboBox();
                    JComboBox cb16 = new JComboBox();
                    JComboBox cb17 = new JComboBox();
                    JComboBox cb18 = new JComboBox();
                            //finals
                            JComboBox cb19 = new JComboBox();
                            JComboBox cb20 = new JComboBox();
                            JComboBox cb21 = new JComboBox();
                            JComboBox cb22 = new JComboBox();
                            JComboBox cb23 = new JComboBox();
                            JComboBox cb24 = new JComboBox();


public forfinals(){

    f1.getContentPane().setLayout(null);
    f1.setSize (300,350);
    f1.getContentPane().add(Lb1);
    f1.getContentPane().add(txt1);
    f1.getContentPane().add(Btn1);
    f1.getContentPane().add(Btn2);
    Lb1.setBounds(40,70,100,75);
    txt1.setBounds(150,90,100,30);
    Btn1.setBounds(40,170,100,40);
    Btn2.setBounds(150,170,100,40);


    Btn1.addActionListener(new ActionListener(){
        public void actionPerformed (ActionEvent e){

            String x;
            x = txt1.getText();
             f2.setTitle(x);
            f2.getContentPane().setLayout(null);
            f2.setSize (830,600);

                f1.hide(); 
                f2.show();  

                    f2.getContentPane().add(Lb2);
                    f2.getContentPane().add(Lb3);
                    f2.getContentPane().add(Lb4);
                    f2.getContentPane().add(Lb5);
                    f2.getContentPane().add(Lb6);
                    f2.getContentPane().add(Lb7);
                    f2.getContentPane().add(Lb8);
                    f2.getContentPane().add(Lb9);
                    f2.getContentPane().add(Lb10);
                    f2.getContentPane().add(Lb11);
                    f2.getContentPane().add(Lb12);
                    f2.getContentPane().add(Lb13);
                    f2.getContentPane().add(jcompute);
                    f2.getContentPane().add(jclear);
                    f2.getContentPane().add(jexit);

                        Lb2.setBounds(30,120,90,70);
                        Lb3.setBounds(30,170,110,70);
                        Lb4.setBounds(30,220,90,70);
                        Lb5.setBounds(30,270,120,70);
                        Lb6.setBounds(30,320,100,70);
                        Lb7.setBounds(30,370,110,70);
                        Lb8.setBounds(280,20,230,20);
                        Lb9.setBounds(30,420,80,70);
                        Lb10.setBounds(190,60,100,100);
                        Lb11.setBounds(315,60,100,100);
                        Lb12.setBounds(440,60,100,100);
                        Lb13.setBounds(570,60,100,100);
                        jcompute.setBounds(660,160,120, 60);
                        jclear.setBounds(660,260,120, 60);
                        jexit.setBounds(660,360,120,60);

//PRELIM

    f2.getContentPane().add(cb1); 
    f2.getContentPane().add(cb2);
    f2.getContentPane().add(cb3);
    f2.getContentPane().add(cb4);
    f2.getContentPane().add(cb5);
    f2.getContentPane().add(cb6);
    f2.getContentPane().add(Btn3);
    f2.getContentPane().add(txt2); 
    txt2.setEditable(false);
            cb1.setBounds(190,140,50,30);
            cb2.setBounds(190,190,50,30);
            cb3.setBounds(190,240,50,30);
            cb4.setBounds(190,290,50,30);
            cb5.setBounds(190,340,50,30);
            cb6.setBounds(190,390,50,30);
            Btn3.setBounds(170,490,95,40);
            txt2.setBounds(190,440,55,35);

        int numbers_to_add_max = 10;
            for (int i = 0; i <= numbers_to_add_max; i++) {
                cb2.addItem(new Integer(i));        
                cb4.addItem(new Integer(i));
                cb5.addItem(new Integer(i));
        }

                        int numbers = 20;
                            for (int i = 0; i <= numbers; i++) {
                                cb1.addItem(new Integer(i));        
                                cb3.addItem(new Integer(i));

                        }   

                                    int numbers_to_add = 30;
                                        for (int i = 0; i <= numbers_to_add; i++) {
                                            cb6.addItem(new Integer(i));
                                    }


//MIDTERM

    f2.getContentPane().add(cb7); 
    f2.getContentPane().add(cb8);
    f2.getContentPane().add(cb9);
    f2.getContentPane().add(cb10);
    f2.getContentPane().add(cb11);
    f2.getContentPane().add(cb12);              
    f2.getContentPane().add(Btn4);
    f2.getContentPane().add(txt3); 
    txt3.setEditable(false);
            cb7.setBounds(315,140,50,30);
            cb8.setBounds(315,190,50,30);
            cb9.setBounds(315,240,50,30);
            cb10.setBounds(315,290,50,30);
            cb11.setBounds(315,340,50,30);
            cb12.setBounds(315,390,50,30);
            Btn4.setBounds(295,490,95,40);
            txt3.setBounds(315,440,55,35);

        int nu = 10;
                for (int i = 0; i <= nu; i++) {
                    cb8.addItem(new Integer(i));        
                    cb10.addItem(new Integer(i));
                    cb11.addItem(new Integer(i));
            }

                        int num = 20;
                            for (int i = 0; i <= num; i++) {
                                cb7.addItem(new Integer(i));        
                                cb9.addItem(new Integer(i));

                        }   

                                    int numb = 30;
                                        for (int i = 0; i <= numb; i++) {
                                            cb12.addItem(new Integer(i));
                                    }

//PREFINAL

    f2.getContentPane().add(cb13); 
    f2.getContentPane().add(cb14);
    f2.getContentPane().add(cb15);
    f2.getContentPane().add(cb16);
    f2.getContentPane().add(cb17);
    f2.getContentPane().add(cb18);
    f2.getContentPane().add(Btn5);
    f2.getContentPane().add(txt4); 
    txt4.setEditable(false);
            cb13.setBounds(440,140,50,30);
            cb14.setBounds(440,190,50,30);
            cb15.setBounds(440,240,50,30);
            cb16.setBounds(440,290,50,30);
            cb17.setBounds(440,340,50,30);
            cb18.setBounds(440,390,50,30);
            Btn5.setBounds(420,490,95,40);
            txt4.setBounds(440,440,55,35);

        int toaddmax = 10;
            for (int i = 0; i <= toaddmax; i++) {
                cb14.addItem(new Integer(i));       
                cb16.addItem(new Integer(i));
                cb17.addItem(new Integer(i));
        }

                        int numbersadd = 20;
                            for (int i = 0; i <= numbersadd; i++) {
                                cb13.addItem(new Integer(i));       
                                cb15.addItem(new Integer(i));

                        }   

                                    int numbers_toadd = 30;
                                        for (int i = 0; i <= numbers_toadd; i++) {
                                            cb18.addItem(new Integer(i));
                                    }


//FINALS

    f2.getContentPane().add(cb19); 
    f2.getContentPane().add(cb20);
    f2.getContentPane().add(cb21);
    f2.getContentPane().add(cb22);
    f2.getContentPane().add(cb23);
    f2.getContentPane().add(cb24);
    f2.getContentPane().add(Btn6);
    f2.getContentPane().add(txt5); 
    txt5.setEditable(false);
            cb19.setBounds(565,140,50,30);
            cb20.setBounds(565,190,50,30);
            cb21.setBounds(565,240,50,30);
            cb22.setBounds(565,290,50,30);
            cb23.setBounds(565,340,50,30);
            cb24.setBounds(565,390,50,30);
            Btn6.setBounds(545,490,95,40);
            txt5.setBounds(565,440,55,35);

        int add_max = 10;
            for (int i = 0; i <= add_max; i++) {
                cb20.addItem(new Integer(i));       
                cb22.addItem(new Integer(i));
                cb23.addItem(new Integer(i));
        }

                        int number = 20;
                            for (int i = 0; i <= number; i++) {
                                cb19.addItem(new Integer(i));       
                                cb21.addItem(new Integer(i));

                        }   

                                    int to_add = 30;
                                        for (int i = 0; i <= to_add; i++) {
                                            cb24.addItem(new Integer(i));
                                    }





        }
    });



        Btn2.addActionListener(new ActionListener(){
            public void actionPerformed (ActionEvent e){

                System.exit(0);

            }
        });


            Btn3.addActionListener(new ActionListener(){
                            public void actionPerformed (ActionEvent e){

                int cb1Int = Integer.parseInt(cb1.getSelectedItem().toString());
                int cb2Int = Integer.parseInt(cb2.getSelectedItem().toString());
                int cb3Int = Integer.parseInt(cb3.getSelectedItem().toString());
                int cb4Int = Integer.parseInt(cb4.getSelectedItem().toString());
                int cb5Int = Integer.parseInt(cb5.getSelectedItem().toString());
                int cb6Int = Integer.parseInt(cb6.getSelectedItem().toString());

                txt2.setText(String.valueOf(cb1Int + cb2Int + cb3Int + cb4Int + cb5Int + cb6Int));

            }
        });


                        Btn4.addActionListener(new ActionListener(){
                                    public void actionPerformed (ActionEvent e){

                            int cb7Int = Integer.parseInt(cb7.getSelectedItem().toString());
                            int cb8Int = Integer.parseInt(cb8.getSelectedItem().toString());
                            int cb9Int = Integer.parseInt(cb9.getSelectedItem().toString());
                            int cb10Int = Integer.parseInt(cb10.getSelectedItem().toString());
                            int cb11Int = Integer.parseInt(cb11.getSelectedItem().toString());
                            int cb12Int = Integer.parseInt(cb12.getSelectedItem().toString());

                            txt3.setText(String.valueOf(cb7Int + cb8Int + cb9Int + cb10Int + cb11Int + cb12Int));



                        }
                    });


                                    Btn5.addActionListener(new ActionListener(){
                                                public void actionPerformed (ActionEvent e){

                                        int cb13Int = Integer.parseInt(cb13.getSelectedItem().toString());
                                        int cb14Int = Integer.parseInt(cb14.getSelectedItem().toString());
                                        int cb15Int = Integer.parseInt(cb15.getSelectedItem().toString());
                                        int cb16Int = Integer.parseInt(cb16.getSelectedItem().toString());
                                        int cb17Int = Integer.parseInt(cb17.getSelectedItem().toString());
                                        int cb18Int = Integer.parseInt(cb18.getSelectedItem().toString());

                                        txt4.setText(String.valueOf(cb13Int + cb14Int + cb15Int + cb16Int + cb17Int + cb18Int));


                                }
                            });



                                                Btn6.addActionListener(new ActionListener(){
                                                            public void actionPerformed (ActionEvent e){

                                                    int cb19Int = Integer.parseInt(cb19.getSelectedItem().toString());
                                                    int cb20Int = Integer.parseInt(cb20.getSelectedItem().toString());
                                                    int cb21Int = Integer.parseInt(cb21.getSelectedItem().toString());
                                                    int cb22Int = Integer.parseInt(cb22.getSelectedItem().toString());
                                                    int cb23Int = Integer.parseInt(cb23.getSelectedItem().toString());
                                                    int cb24Int = Integer.parseInt(cb24.getSelectedItem().toString());

                                                    txt5.setText(String.valueOf(cb19Int + cb20Int + cb21Int + cb22Int + cb23Int + cb24Int));
                                            }
                                        });


    jcompute.addActionListener(new ActionListener(){
        public void actionPerformed (ActionEvent e){




            String prelim, midterm, prefinal, finals, total;
            double a, b, c, d, tg;

                prelim = txt2.getText();
                midterm = txt3.getText();
                prefinal = txt4.getText();
                finals = txt5.getText();

                    a = Double.parseDouble(prelim);
                    b = Double.parseDouble(midterm);
                    c = Double.parseDouble(prefinal);
                    d = Double.parseDouble(finals);

                        tg = (a + b + c + d)/4;                         
                            total = Double.toString(tg);
                            finalg.setText(total);


                                                    JFrame f3 = new JFrame ("STUDENT  FINAL RATING");

            f3.getContentPane().setLayout(null);
            f3.setSize (350,300);

                                //the frame2 (f2); the two frames are still visible
                    f2.hide();
                    f3.show();


                    f3.getContentPane().add(label1);
                    f3.getContentPane().add(label2);
                    f3.getContentPane().add(finalg);
                    finalg.setEditable(false);
                    f3.getContentPane().add(finalr);
                    finalr.setEditable(false);
                    f3.getContentPane().add(finalb);

                        label1.setBounds(70,20,150,70);
                        label2.setBounds(90,70,200,70);
                        finalg.setBounds(205,40,50,30);
                        finalr.setBounds(140,140,50,40);
                        finalb.setBounds(130,200,70,30);

    //EQUIVALENT



    grade = Double.parseDouble(finalg.getText());

    if(grade>=99.50 && grade<101)
    equiv = 1.00;
    else if(grade<99.50 && grade>=98.50)
    equiv = 1.10;
    else if(grade<98.50 && grade>=97.50)
    equiv = 1.20;
    else if(grade<97.50 && grade>=96.50)
    equiv = 1.30;
    else if(grade<96.50 && grade>=95.50)
    equiv = 1.40;
    else if(grade<95.50 && grade>=94.50)
    equiv = 1.50;
    else if(grade<94.50 && grade>=93.50)
    equiv = 1.60;
    else if(grade<93.50 && grade>=92.50)
    equiv = 1.70;
    else if(grade<92.50 && grade>=91.50)
    equiv = 1.80;
    else if(grade<91.50 && grade>=90.50)
    equiv = 1.90;
    else if(grade<90.50 && grade>=89.50)
    equiv = 2.00;
    else if(grade<89.50 && grade>=88.50)
    equiv = 2.10;
    else if(grade<88.50 && grade>=87.50)
    equiv = 2.20;
    else if(grade<87.50 && grade>=86.50)
    equiv = 2.30;
    else if(grade<86.50 && grade>=85.50)
    equiv = 2.40;
    else if(grade<85.50 && grade>=84.50)
    equiv = 2.50;
    else if(grade<84.50 && grade>=83.50)
    equiv = 2.60;
    else if(grade<83.50 && grade>=82.50)
    equiv = 2.70;
    else if(grade<82.50 && grade>=81.50)
    equiv = 2.80;
    else if(grade<81.50 && grade>=80.50)
    equiv = 2.90;
    else if(grade<80.50 && grade>=79.50)
    equiv = 3.00;
    else if(grade<79.50 && grade>=78.50)
    equiv = 3.10;
    else if(grade<78.50 && grade>=77.50)
    equiv = 3.20;
    else if(grade<77.50 && grade>=76.50)
    equiv = 3.30;
    else if(grade<76.50 && grade>=75.50)
    equiv = 3.40;
    else if(grade<75.50 && grade>=74.50)
    equiv = 3.50;
    else
    equiv = 5.0;

    finalr.setText("" + equiv);
    finalr.setEditable(false);


    }
});
   finalb.addActionListener(new ActionListener() {

        @Override
        public void actionPerformed(ActionEvent e) {

             JOptionPane.showMessageDialog(null, "" + equiv);

            if (equiv  >=1.00 && equiv <=3.0) JOptionPane.showMessageDialog(null, " YOU PASSED!");
       else if (equiv >=3.10 && equiv <=75) JOptionPane.showMessageDialog(null, " YOU FAILED!");
        }
    });












        jclear.addActionListener(new ActionListener(){
            public void actionPerformed (ActionEvent e){


                cb1.setSelectedItem(Integer.valueOf(0));
                cb2.setSelectedItem(Integer.valueOf(0));
                cb3.setSelectedItem(Integer.valueOf(0));
                cb4.setSelectedItem(Integer.valueOf(0));
                cb5.setSelectedItem(Integer.valueOf(0));
                cb6.setSelectedItem(Integer.valueOf(0));
                cb7.setSelectedItem(Integer.valueOf(0));
                cb8.setSelectedItem(Integer.valueOf(0));
                cb9.setSelectedItem(Integer.valueOf(0));
                cb10.setSelectedItem(Integer.valueOf(0));
                cb11.setSelectedItem(Integer.valueOf(0));
                cb12.setSelectedItem(Integer.valueOf(0));
                cb13.setSelectedItem(Integer.valueOf(0));
                cb14.setSelectedItem(Integer.valueOf(0));
                cb15.setSelectedItem(Integer.valueOf(0));
                cb16.setSelectedItem(Integer.valueOf(0));
                cb17.setSelectedItem(Integer.valueOf(0));
                cb18.setSelectedItem(Integer.valueOf(0));
                cb19.setSelectedItem(Integer.valueOf(0));
                cb20.setSelectedItem(Integer.valueOf(0));
                cb21.setSelectedItem(Integer.valueOf(0));
                cb22.setSelectedItem(Integer.valueOf(0));
                cb23.setSelectedItem(Integer.valueOf(0));
                cb24.setSelectedItem(Integer.valueOf(0));



                txt2.setText(" ");
                txt3.setText(" ");
                txt4.setText(" ");
                txt5.setText(" ");          

            }
        });



    jexit.addActionListener(new ActionListener(){
    public void actionPerformed (ActionEvent e){

    System.exit(0);

                                        }
                                    });



        f1.show();

}

    public static void main (String args []){
        forfinals xx = new forfinals(); 

            }
}

Это были проблемы,

1. Когда вы даете ноль в кавычках, например "0", он принимается как строка, тогда как Integer это то, что требуется.

2. jFrame f2 не был доступен, потому что он был определен внутри другого события действия.

3.Так же была проблема с переменной equiv, поэтомуон не был доступен в случае jOptionpane.

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