Я хочу уменьшить расстояние между метками и группой переключателей.Можете ли вы исправить форматирование меток и группы переключателей.Я получаю ненужный интервал. Также я хочу изменить метку переключателя в соответствии с данными из базы данных доступа.Пожалуйста, помогите
import javax.swing.*;
import java.awt.*;
import javax.swing.border.TitledBorder;
import java.awt.event.*;
import javax.swing.border.*;
import javax.swing.Box;
import javax.swing.JApplet;
import java.awt.Container;
import java.sql.*;
public class CreateRadioButton11 extends JApplet {
JFrame jtfMainFrame;
JButton getAccountButton, lastButton, firstButton, gotoButton, previousButton, nextButton;
JTextField jtfInput;
static JRadioButton[] choice = new JRadioButton[5];
public CreateRadioButton11() {
jtfMainFrame = new JFrame("Online Examination");
jtfMainFrame.setSize(800, 500);
jtfMainFrame.setLocation(200, 150);
jtfMainFrame.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
System.exit(0);
}
});
JPanel panel = new JPanel();
nextButton = new JButton(">");
previousButton = new JButton("<");
lastButton = new JButton(">|");
firstButton = new JButton("|<");
gotoButton = new JButton("Goto");
jtfInput = new JTextField(20);
gotoButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
jtfInput.setText("Button 1!");
}
});
getAccountButton = new JButton("Finish");
panel.add(jtfInput);
panel.add(getAccountButton);
panel.add(previousButton);
panel.add(nextButton);
panel.add(lastButton);
panel.add(firstButton);
panel.add(gotoButton);
JLabel aLabel = new JLabel("a.");
aLabel.setOpaque(true);
aLabel.setForeground(Color.blue);
aLabel.setBackground(Color.lightGray);
JLabel bLabel = new JLabel("b.");
bLabel.setOpaque(true);
bLabel.setForeground(Color.blue);
bLabel.setBackground(Color.lightGray);
JLabel cLabel = new JLabel("c.");
cLabel.setOpaque(true);
cLabel.setForeground(Color.blue);
cLabel.setBackground(Color.lightGray);
JLabel dLabel = new JLabel("d.");
dLabel.setOpaque(true);
dLabel.setForeground(Color.blue);
dLabel.setBackground(Color.lightGray);
JLabel eLabel = new JLabel("e.");
eLabel.setOpaque(true);
eLabel.setForeground(Color.blue);
eLabel.setBackground(Color.lightGray);
choice[0] = new JRadioButton("a");
choice[0].setBackground(Color.red);
choice[1] = new JRadioButton("b");
choice[1].setBackground(Color.red);
choice[2] = new JRadioButton("c");
choice[2].setBackground(Color.red);
choice[3] = new JRadioButton("d");
choice[3].setBackground(Color.red);
choice[4] = new JRadioButton("e");
choice[4].setBackground(Color.red);
ButtonGroup bGroup = new ButtonGroup();
for (int i = 0; i < 5; i++) {
bGroup.add(choice[i]);
}
JPanel panEast = new JPanel(new BorderLayout(5, 5));
jtfMainFrame.setContentPane(panEast);
JPanel panlabels = new JPanel(new GridLayout(0, 1));
JPanel pancontrols = new JPanel(new GridLayout(0, 1));
panEast.add(panlabels, BorderLayout.WEST);
panEast.add(pancontrols, BorderLayout.CENTER);
panlabels.add(aLabel);
pancontrols.add(choice[0]);
panlabels.add(bLabel);
pancontrols.add(choice[1]);
panlabels.add(cLabel);
pancontrols.add(choice[2]);
panlabels.add(dLabel);
pancontrols.add(choice[3]);
panlabels.add(eLabel);
pancontrols.add(choice[4]);
panEast.setBorder(BorderFactory.createTitledBorder(
BorderFactory.createEtchedBorder(), "Select your answer"));
panel.add("West", panEast);
Container contentPane = jtfMainFrame.getContentPane();
contentPane.add(panel, BorderLayout.CENTER);
contentPane.add(panEast, BorderLayout.NORTH);
jtfMainFrame.add(panel);
jtfMainFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
jtfMainFrame.setVisible(true);
}
public static void main(String[] args) {
CreateRadioButton11 r = new CreateRadioButton11();
try {
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
String dataSourceName = "access";
String dbURL = "jdbc:odbc:" + dataSourceName;
Connection con = DriverManager.getConnection(dbURL, "", "");
Statement s = con.createStatement();
s.execute("create table TEST12345 ( column_name integer )");
s.execute("insert into TEST12345 values(1)");
s.execute("select column_name from TEST12345");
ResultSet rs = s.getResultSet();
if (rs != null) {
while (rs.next()) {
System.out.println("Data from column_name: " + rs.getString(1));
}
}
choice[0].setText(rs.getString(1));
s.execute("drop table TEST12345");
s.close();
con.close();
} catch (Exception err) {
System.out.println("ERROR: " + err);
}
}
}
Я получаю ошибку как
Exception in thread "main" java.lang.IllegalArgumentException: adding container's parent to itself
at java.awt.Container.checkAddToSelf(Unknown Source)
at java.awt.Container.addImpl(Unknown Source)
at java.awt.Container.add(Unknown Source)
at CreateRadioButton11.<init>(CreateRadioButton11.java:172)
at CreateRadioButton11.main(CreateRadioButton11.java:190)