test1とtest2の2つのビューがあります
test1からtest2への切り替えは正常に機能しますが、test2から切り替えるとcontentPanelが空になります。これは私のコードです。誰かが私が間違っていることを指摘できますか?
test1
import java.awt.BorderLayout;
import java.awt.EventQueue;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.border.EmptyBorder;
import javax.swing.JButton;
public class test1 extends JFrame {
JPanel contentPane;
/**
* Launch the application.
*/
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
public void run() {
try {
test1 frame = new test1();
frame.setVisible(true);
} catch (Exception e) {
e.printStackTrace();
}
}
});
}
/**
* Create the frame.
*/
public test1() {
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setBounds(100, 100, 450, 300);
contentPane = new JPanel();
contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
contentPane.setLayout(new BorderLayout(0, 0));
setContentPane(contentPane);
JButton btnView = new JButton("View2");
contentPane.add(btnView, BorderLayout.CENTER);
btnView.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
contentPane.removeAll();
contentPane.invalidate();
test2 obj=new test2();
obj.contentPane.setVisible(true);
contentPane.add(obj.contentPane);
((JPanel)contentPane).revalidate();
contentPane.repaint(); }
});
}
}
test2
import java.awt.BorderLayout;
import java.awt.EventQueue;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.border.EmptyBorder;
import javax.swing.JButton;
public class test2 extends JFrame {
JPanel contentPane;
/**
* Launch the application.
*/
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
public void run() {
try {
test2 frame = new test2();
frame.setVisible(true);
} catch (Exception e) {
e.printStackTrace();
}
}
});
}
/**
* Create the frame.
*/
public test2() {
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setBounds(100, 100, 450, 300);
contentPane = new JPanel();
contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
setContentPane(contentPane);
contentPane.setLayout(null);
JLabel lblThisIsView = new JLabel("this is view 2!");
lblThisIsView.setBounds(178, 107, 110, 14);
contentPane.add(lblThisIsView);
JButton btnView = new JButton("View 1!");
btnView.setBounds(168, 161, 89, 23);
contentPane.add(btnView);
btnView.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
contentPane.removeAll();
contentPane.invalidate();
test1 obj=new test1();
obj.contentPane.setVisible(true);
contentPane.add(obj.contentPane);
((JPanel)contentPane).revalidate();
contentPane.repaint();
}
});
}
}