Swing界面开发与事件监听

import javax.swing.*;

public class JavaFrame extends JFrame {
	
	public void showFrame(){
		//窗口的标题
		this.setTitle("JavaFrame");
		//窗口的位置与大小
		this.setBounds(350,300,300,250);
		
		//建立一个“账户”标签
		javax.swing.JLabel user = new javax.swing.JLabel("账户:");
		//建立一个“密码”标签
		javax.swing.JLabel pwd = new javax.swing.JLabel("密码:");
		//建立一个账户输入框
		javax.swing.JTextField tf = new javax.swing.JTextField(10);
		//建立一个密码输入框
		javax.swing.JPasswordField pw = new javax.swing.JPasswordField(10);
		//建立一个“登陆”按钮 
		javax.swing.JButton jb = new javax.swing.JButton("登陆");
		
		//在窗口上添加组件
		this.setLayout(null);
		this.add(user);
		this.add(tf);
		this.add(pwd);
		this.add(pw);
		this.add(jb);
		//设置组件的坐标
		user.setBounds(50, 30, 100, 30);
		tf.setBounds(110, 30, 120, 25);
		pwd.setBounds(50, 80, 100, 30);
		pw.setBounds(110, 80, 120, 25);
		jb.setBounds(90, 120, 100, 30);
		
		
		//建立监听
		FrameListener fl = new FrameListener(jb,tf,pw);
		jb.addActionListener(fl);
		
		//窗口可见
		this.setVisible(true);
		//关闭窗口时退出程序
		this.setDefaultCloseOperation(3);
	}

	//程序入口
	public static void main(String args[]){
		JavaFrame jf = new JavaFrame();
		jf.showFrame();
		
	}
}

 

import java.awt.event.ActionEvent;
import javax.swing.*;

public class FrameListener implements java.awt.event.ActionListener {

	private JButton jb;
	private JTextField tf;
	private JPasswordField pw;

	//构造器传参
    public	FrameListener(JButton jb,JTextField tf,JPasswordField pw){
    	this.jb = jb;
    	this.tf = tf;
    	this.pw = pw;
    }
	
	public void actionPerformed(ActionEvent e) {
		System.out.println("监听被触发");
		String pWord = new String(pw.getPassword());
		if(tf.getText().equals("user")&&pWord.equals("123")){
			System.out.println("哈哈哈，我终于登陆进来啦！");
		}else{
			System.out.println("您的账户或密码错误，请仔细核对后再登陆。");
		}
		
	}

	
}