ch9_33.java

java图形用户界面设计 包括如何创建窗体 设计界面 管理布局 绘制图形 使用组件 事件编程等

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class ch9_33 extends JFrame
{
    {
        setBounds(20,20,500,300);
        getContentPane().setLayout(null);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);              
    }
    public static void main(String [] args)
    {
        ch9_33 f=new ch9_33();
        f.getContentPane().setLayout(new BorderLayout());
        
        JPanel p1=new JPanel();
        p1.setLayout(new GridBagLayout());
        GridBagConstraints gbc=new GridBagConstraints();
        gbc.anchor=GridBagConstraints.WEST;
        gbc.insets=new Insets(2,2,2,2);
        
        p1.setBorder(BorderFactory.createTitledBorder("你的基本数据"));
        JLabel l1=new JLabel("姓名:");
        JLabel l2=new JLabel("性别:");
        JLabel l3=new JLabel("身高:");
        JLabel l4=new JLabel("体重:");
        
        JPasswordField t1=new JPasswordField();
        JPasswordField t2=new JPasswordField(2);
        JPasswordField t3=new JPasswordField("175cm");
        JPasswordField t4=new JPasswordField("50kg-太瘦了",10);
        
        // 默认的为*,利用下面的方法改变
        t1.setEchoChar('#');
        t2.setEchoChar('%');
        t3.setEchoChar('&');
        t4.setEchoChar('m');
        
        
        gbc.gridy=1;
        gbc.gridx=0;
        p1.add(l1,gbc);
        gbc.gridx=1;
        p1.add(t1,gbc);
        
        gbc.gridy=2;
        gbc.gridx=0;
        p1.add(l2,gbc);
        gbc.gridx=1;
        p1.add(t2,gbc);
        
        gbc.gridy=3;
        gbc.gridx=0;
        p1.add(l3,gbc);
        gbc.gridx=1;
        p1.add(t3,gbc);
        
        gbc.gridy=4;
        gbc.gridx=0;
        p1.add(l4,gbc);
        gbc.gridx=1;
        p1.add(t4,gbc);
        
        f.getContentPane().add(p1);
        f.pack();
        f.show();
    }
        

}