Я новичок в Java GUI и учусь создавать JPanel, а затем использовать ту же панель для переключения на ней другого содержимого. Когда я нажимаю кнопку в первый раз, информация появляется, и если я нажимаю кнопку «назад» и снова нажимаю кнопку «Обучение лидерству», ничего не появлялось. Я пытался использовать removeAll(), repaint() и revalidate() на allContentPanel(), но это не сработало.
import java.util.*;
import javax.swing.*;
import java.awt.*;
import java.awt.Image;
import java.awt.event.*;
import java.text.*;
import javax.sound.sampled.AudioInputStream;
import javax.sound.sampled.Clip;
import javax.sound.sampled.AudioSystem;
import java.io.File;
public class Execute extends JFrame implements ActionListener
{
private static CardLayout cardLayout = new CardLayout();
private static JPanel cardPanels,panelMenu,panelInfo,panelSub,allContentPanel;
private static JScrollPane scrollpane1;
private static Font titleFont = new Font(Font.DIALOG,Font.BOLD,30);
private static Font contentFont = new Font(Font.DIALOG,Font.PLAIN,20);
private static Font spacingFont = new Font(Font.DIALOG,Font.PLAIN,5);
private static ArrayList<JTextArea> info,leadershipInfo,timeInfo;
public Execute()
{
super("Training Management System");
setSize(1500,800);
setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
init();
setVisible(true);
}
public static void main(String[] args)
{
new Execute();
}
public void init()
{
cardPanels = new JPanel();
cardPanels.setLayout(cardLayout);
allContentPanel = new JPanel();
panelMenu = new JPanel(null);
panelInfo = new JPanel(null);
panelSub = new JPanel(null);
cardPanels.add(panelMenu,"menu");
cardPanels.add(panelInfo,"infoMenu");
cardPanels.add(panelSub,"subInfo");
add(cardPanels);
leadershipInfo = new ArrayList <JTextArea> ();
leadershipInfo.add(new JTextArea(" 1. Understand emotional intelligence and how to demonstrate it in the workplace."));
leadershipInfo.add(new JTextArea(" 2. Become self-aware and learn how to build meaningful relationships."));
leadershipInfo.add(new JTextArea(" 3. Understand how to build and maintain leadership presence."));
leadershipInfo.add(new JTextArea(" 4. Study in depth the essentials of leadership, like how to motivate your team."));
leadershipInfo.add(new JTextArea(" 5. Go through management essentials, like how to communicate effectively."));
leadershipInfo.add(new JTextArea(" 6. Understand how leadership models are put into practice personally, locally, and globally."));
leadershipInfo.add(new JTextArea(" 7. Gain a greater understanding of their own personal identities and how their identities shape their leadership " + "\n and followership."));
leadershipInfo.add(new JTextArea(" Great leaders are individuals who are passionate and confident about their work, and they inspire others in the " +
"\n process. Become self-aware, confident and able to make a great first impression. Gain practical knowledge of " +
"\n team work, communication and how to motivate your team at work. Whether you are new to management or " +
"\n have plenty of experience, this course is a helpful and informative guide. Our learning material is available to " +
"\n students 24/7 anywhere in the world, so it is extremely convenient. These intensive online courses are open to " +
"\n everyone, as long as you have an interest in the topic! We provide world-class learning, so you can be assured " +
"\n that the material is high quality, accurate and up-to-date."));
showMenu();
}
public void showMenu()
{
panelMenu.setBackground(new Color(1,121,111));
JButton buttonCI = new JButton ("View Course Info");
panelMenu.add(buttonCI);
buttonCI.setBounds(550,230,400,80);
buttonCI.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e)
{
cardLayout.show(cardPanels,"infoMenu");
}
});
JButton buttonTT = new JButton ("View Timetable");
panelMenu.add(buttonTT);
buttonTT.setBounds(550,340,400,80);
JButton buttonTMP = new JButton ("Track My Progress");
panelMenu.add(buttonTMP);
buttonTMP.setBounds(550,450,400,80);
showSubMenu();
}
public void showSubMenu()
{
panelInfo.setBackground(new Color(1,121,111));
JButton buttonLT = new JButton ("Leadership Training");
panelInfo.add(buttonLT);
buttonLT.setBounds(550,120,400,80);
buttonLT.addActionListener(this);
JButton buttonTM = new JButton ("Time Management");
panelInfo.add(buttonTM);
buttonTM.setBounds(550,230,400,80);
JButton buttonEC = new JButton ("Effective Communication");
panelInfo.add(buttonEC);
buttonEC.setBounds(550,340,400,80);
JButton buttonPM = new JButton ("Project Management");
panelInfo.add(buttonPM);
buttonPM.setBounds(550,450,400,80);
JButton buttonDT = new JButton ("Diversity Training");
panelInfo.add(buttonDT);
buttonDT.setBounds(550,560,400,80);
JButton buttonBack = new JButton ("Back");
panelInfo.add(buttonBack);
buttonBack.setBounds(20,650,80,80);
buttonBack.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e)
{
cardLayout.show(cardPanels,"menu");
}
});
}
public void showPanelSub()
{
panelSub.setBackground(new Color(1,121,111));
JButton buttonBack = new JButton ("Back");
panelSub.add(buttonBack);
buttonBack.setBounds(20,650,80,80);
buttonBack.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e)
{
cardLayout.show(cardPanels,"infoMenu");
}
});
allContentPanel.setBackground(Color.WHITE);
BoxLayout boxlayout = new BoxLayout(allContentPanel, BoxLayout.Y_AXIS);
allContentPanel.setLayout(boxlayout);
JTextArea outcomeTitle = new JTextArea(" Learning Outcome");
JTextArea spacing1 = new JTextArea(" ");
JTextArea spacing2 = new JTextArea(" ");
JTextArea introTitle = new JTextArea(" Subject Introduction");
JTextArea spacing3 = new JTextArea(" ");
infoFormat(outcomeTitle,"title");
infoFormat(spacing1,"spacing");
infoFormat(info.get(0),"content");
infoFormat(info.get(1),"content");
infoFormat(info.get(2),"content");
infoFormat(info.get(3),"content");
infoFormat(info.get(4),"content");
infoFormat(info.get(5),"content");
infoFormat(info.get(6),"content");
infoFormat(spacing2,"content");
infoFormat(introTitle,"title");
infoFormat(spacing3,"spacing");
infoFormat(info.get(7),"content");
scrollpane1 = new JScrollPane(allContentPanel,JScrollPane.VERTICAL_SCROLLBAR_ALWAYS,JScrollPane.HORIZONTAL_SCROLLBAR_NEVER);
scrollpane1.setBounds(250,150,1000,500);
panelSub.add(scrollpane1);
}
public void infoFormat(JTextArea text, String type)
{
if (type.equals("title"))
text.setFont(titleFont);
else if (type.equals("content"))
text.setFont(contentFont);
else if (type.equals("spacing"))
text.setFont(spacingFont);
text.setEditable(false);
text.setLineWrap(true);
text.setWrapStyleWord(true);
allContentPanel.add(text);
}
public void actionPerformed(ActionEvent e)
{
if (e.getActionCommand().equals("Leadership Training"))
{
info = leadershipInfo;
}
else if (e.getActionCommand().equals("Time Management"))
{ //will continue when get the first successful
}
else if (e.getActionCommand().equals("Effective Communication"))
{ //will continue when get the first successful
}
else if (e.getActionCommand().equals("Project Management"))
{ //will continue when get the first successful
}
else if (e.getActionCommand().equals("Diversity Training"))
{ //will continue when get the first successful
}
showPanelSub();
cardLayout.show(cardPanels,"subInfo");
}
}