Swing组件实战-优快云博客

本文链接：https://blog.youkuaiyun.com/zhlinpb/article/details/6257200

看来，事件驱动是个难啃的骨头啊！勉强写了段代码，总算运行通过了，但很多地方没有弄明白，加油！！这个例子主要是学习Swing里的JButton、JTextField和PasswordField三个组件的。

运行效果：

源代码：

import java.awt.Container; import java.awt.Image; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.awt.event.FocusAdapter; import java.awt.event.FocusEvent; import javax.swing.ImageIcon; import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JPasswordField; import javax.swing.JTextField; import javax.swing.SwingConstants; public class five extends JFrame implements ActionListener { JLabel l1,l2,l3; JTextField t1,t2; JPasswordField t3; JButton b1,b2; ImageIcon my1,my2,my3; public five(String s) { super(s); Container con=getContentPane(); setVisible(true); setBounds(250, 200, 500, 360); my1 = new ImageIcon(new ImageIcon("1.png").getImage().getScaledInstance(20,20, Image.SCALE_DEFAULT)); my2 = new ImageIcon(new ImageIcon("1.gif").getImage().getScaledInstance(20,20, Image.SCALE_DEFAULT)); my3 = new ImageIcon(new ImageIcon("2.gif").getImage().getScaledInstance(20,20, Image.SCALE_DEFAULT)); l3=new JLabel("<html><b><font size=11 color=red>欢迎体验测试窗体效果</font></b></html>"); l1=new JLabel("用户名：",my2,SwingConstants.CENTER); t1=new JTextField("请在此输入用户名",20); l2=new JLabel("密码：",my3,SwingConstants.CENTER); t3=new JPasswordField(10); t3.setEchoChar('#');//注意：不能用"#",要用'#' t2=new JTextField(310); t2.setHorizontalAlignment(JTextField.CENTER); t2.setEditable(false); b1=new JButton("登录",my1); b2=new JButton("退出",new ImageIcon("退出.gif")); t3.addActionListener(this); b1.addActionListener(this); b2.addActionListener(this); con.setLayout(null); //con.setBackground(new Color(100, 100, 200)); con.add(l3); con.add(l1); con.add(t1); con.add(l2); con.add(t3); con.add(t2); con.add(b1); con.add(b2); l3.setBounds(50, 15, 400, 50); l1.setBounds(100, 100, 100, 30); t1.setBounds(200, 100, 150, 30); l2.setBounds(100, 150, 100, 30); t3.setBounds(200, 150, 150, 30); t2.setBounds(80, 200, 320, 30); b1.setBounds(130, 250, 100, 30); b2.setBounds(270, 250, 100, 30); //t1.requestFocus();//设置t1得到焦点 t1.addFocusListener(new FocusAdapter() { public void focusGained(FocusEvent arg0) { t2.setText("请输入你的用户名"); t1.selectAll();//全选 } }); t3.addFocusListener(new FocusAdapter() { public void focusGained(FocusEvent arg0) {t2.setText("请输入你的密码");} }); } public void actionPerformed(ActionEvent e) { if(e.getSource()==b1) {t2.setText("您点击了确定按钮");} else if(e.getSource()==b2) {System.exit(0);} } public static void main(String[] args) { JFrame f =new five("组件测试窗口"); f.setVisible(true); f.setResizable(false); f.setDefaultCloseOperation(DISPOSE_ON_CLOSE); } }