import javax.swing.*;
import java.awt.*;
public class Lianxi3 extends JPanel {
public static void main(String[] args){
JFrame f=new JFrame();
f.setSize(400,200);
f.setTitle("第二个练习了");
f.setDefaultCloseOperation(f.EXIT_ON_CLOSE);
Container contentPane=f.getContentPane();
contentPane.add(new Lianxi3());
f.setVisible(true);
}
private JPanel part1(){
JPanel panel=new JPanel();
panel.add(new JLabel("数据:"));
panel.add(new JTextField("请输入数据",10));
panel.setVisible(true);
return panel;
}
private JPanel part2(){
JPanel panel=new JPanel();
panel.add(new JButton("退出"));
panel.add(new JButton("重置"));
panel.add(new JButton("确定"));
panel.setVisible(true);
return panel;
}
}
为什么用part?怎么用?