Question

eclipse运行代码无反应，控制台显示终止

代码如下：
package swing;

import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.*;

@SuppressWarnings("serial")
class MyJDialog extends JDialog{
public MyJDialog(MyFrame frame){
super(frame,"窗体",true);
Container container=getContentPane();
container.add(new JLabel("对话框"));
setBounds(120,120,100,100);
}
}
@SuppressWarnings("serial")
public class MyFrame extends JFrame{
public static void main(String args[]){
new MyFrame();
}
public MyFrame(){
Container container=getContentPane();
container.setLayout(null);
JLabel jl=new JLabel("JFrame窗体");
jl.setHorizontalAlignment(SwingConstants.CENTER);
container.add(jl);
JButton bl=new JButton("弹出对话框");
bl.setBounds(10, 10, 100, 21);
bl.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e){
new MyJDialog(MyFrame.this).setVisible(true);
}
});
container.add(bl);
}

}

Answer 1

修改后的代码：

import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.*;

@SuppressWarnings("serial")
class MyJDialog extends JDialog {
    public MyJDialog(MyFrame frame) {
        super(frame,"窗体",true);
        Container container=getContentPane();
        container.add(new JLabel("对话框"));
        setBounds(120,120,100,100);
    }
}
@SuppressWarnings("serial")
public class MyFrame extends JFrame {
    public static void main(String args[]) {
        new MyFrame();
    }
    public MyFrame() {
        Container container=getContentPane();
        container.setLayout(null);
        JLabel jl=new JLabel("JFrame窗体");
        jl.setHorizontalAlignment(SwingConstants.CENTER);
        container.add(jl);
        JButton bl=new JButton("弹出对话框");
        bl.setBounds(10, 10, 100, 21);
        bl.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                new MyJDialog(MyFrame.this).setVisible(true);
            }
        });
        container.add(bl);
		this.setBounds(100, 100, 300, 500);	//设置窗体大小
		this.setVisible(true);	//设置窗体可见
    }
}