Question

怎样在JFrame中添加一个JInternalFrame

初学我想实现 在JFrame中通过b按钮 弹出JInternalFrame 但是实现不了 求高手指点。
import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
public class AdminFrame extends JFrame implements ActionListener{
JButton b;
public JDesktopPane desktop=null;
public AdminFrame(){
super("");
this.setBounds(570,260,300,240);
this.setDefaultCloseOperation(EXIT_ON_CLOSE);
this.setBackground(java.awt.Color.lightGray);
this.setLayout(new java.awt.FlowLayout(FlowLayout.LEFT));
b=new JButton();
desktop = new JDesktopPane();
this.getContentPane().add(desktop);
this.setVisible(true);

}
public void actionPerformed(ActionEvent e){
if(e.getSource()==b){
new NewUserFrame();
}
}
}

import java.awt.*;
import javax.swing.*;
public class NewUserFrame extends JInternalFrame{
JTextField newNumber = null;
JTextField newPassword= null;
JTextField rePassword= null;
public NewUserFrame(){
super("",true,true,true,true);
this.setSize(300,300);
newNumber = new JTextField(18);
newPassword = new JTextField(18);
rePassword = new JTextField(18);
this.getContentPane().add(newNumber);
this.getContentPane().add(newPassword);
this.getContentPane().add(rePassword);
this.setVisible(true);
}
}

Answer 1

有两个地方需要修改：
1、如果使用FlowLayout，那么应该设置desktop的preferredSize
2、将你的InternalFrame加入desktop中

改后：

public class AdminFrame extends JFrame implements ActionListener {

JButton b;
public JDesktopPane desktop = null;

public AdminFrame() {
super("");
this.setBounds(570, 260, 300, 240);
this.setDefaultCloseOperation(EXIT_ON_CLOSE);
this.setBackground(java.awt.Color.lightGray);
this.setLayout(new java.awt.FlowLayout(FlowLayout.LEFT));
b = new JButton("Show Internal Frame");
b.addActionListener(this);
desktop = new JDesktopPane();
desktop.setPreferredSize(new Dimension(300, 300));//设置desktop的大小
this.getContentPane().add(desktop);
this.getContentPane().add(b);
this.setVisible(true);
}

public void actionPerformed(ActionEvent e) {
if (e.getSource() == b) {
NewUserFrame newUserFrame = new NewUserFrame();
desktop.add(newUserFrame); //将Internal Frame加入desktop中
}
}

public static void main(String[] args) {
new AdminFrame();
}
}

Answer 2

main方法呢

追问

public static void main(String[] args) { //main 方法 在AdminFrame类中
new AdminFrame();
}