Java图形化界面按钮事件响应的应用

分手后的思念是犯贱 2022-05-20 08:15 192阅读 0赞

package dierzhou;
    
    import java.awt.Button;
    import java.awt.event.ActionEvent;
    import java.awt.event.ActionListener;
    
    import javax.swing.JButton;
    import javax.swing.JFrame;
    import javax.swing.JLabel;
    import javax.swing.JOptionPane;
    import javax.swing.JPanel;
    import javax.swing.JPasswordField;
    import javax.swing.JTextField;
    import javax.swing.text.Document;
    
    
    class Listen implements ActionListener{ //ActionListener用来响应用户点击按钮
      private static JFrame frame;
    	public void actionPerformed(ActionEvent e) {  //定义处理事件的方法
    		// TODO Auto-generated method stub
    		String name=e.getActionCommand();//返回与此动作相关的命令字符串
    		if(name.equals("登录")){
    		JOptionPane.showMessageDialog(frame, "登录失败","提示",JOptionPane.ERROR_MESSAGE);
    	} else if(name.equals("退出")){
    		JOptionPane.showMessageDialog(frame, "确定要退出吗","提示",JOptionPane.INFORMATION_MESSAGE);
    		System.exit(0); //退出
    	}
    }
    }
    public  class text1 extends Listen {
    	 public static void main(String[] args) {
               JFrame jf=new JFrame("java");
               JLabel jl=new JLabel("账号");
               JTextField t1=new JTextField(12);
               JLabel j2=new JLabel("密码");
               JPasswordField t2=new JPasswordField(12); 
               JButton b1 =new JButton("登录");
               JButton b2 =new JButton("退出");
               JPanel jp=new JPanel();
               jp.add(jl);
               jp.add(t1);
               jp.add(j2);
               jp.add(t2);
               jp.add(b1);
               jp.add(b2);
               jf.add(jp);
               jf.setSize(200, 200);//宽 高
               jf.setLocation(700, 300); 设置框架的位置
               jf.setVisible(true);   //显示按钮
               Listen l=new Listen();  
               b1.addActionListener(l);
               b2.addActionListener(l);//按钮登录，退出共享绑定事件监控器
    	}
    }

![70][]![70 1][]

JOptionPane          JOptionPane.showMessageDialog(frame, "确定要退出吗","提示",JOptionPane.INFORMATION_MESSAGE);

主要用到四种消息提示框方法：   
showConfirmDialog()：确认对话框   
showInputDialog()：输入对话框   
showMessageDialog()：消息对话框   
showOptionDialog()：选择对话框

![70 2][]

[70]: https://img-blog.csdn.net/20180715194145892?watermark/2/text/aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2xpdWp1Y2Fp/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70
[70 1]: /images/20220520/e07ebdad952e4e0fbc289ac9d4628cdb.png
[70 2]: /images/20220520/3b2b7d35b5fd4a16a19f2db036f80784.png