java通过JFrame做一个登录系统的界面完整代码示例

package com.sxt;
import java.awt.Container;
import java.awt.GridLayout;
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.JPasswordField;
import javax.swing.JTextField;
public class LoginFrame extends JFrame{
	JTextField txtname=new JTextField();
	JPasswordField txtpass=new JPasswordField();
	JButton bl=new JButton("登录");
	JButton bg=new JButton("关闭");
	//构造无参构造器把主要的方法放在构造器里,然后在main方法里面调
	public LoginFrame(){
		setBounds(25,25,250,250);
		Container c = getContentPane();
		c.setLayout(new GridLayout(4,2,10,10));
		c.add(new JLabel("用户名"));
		c.add(txtname);
		c.add(new JLabel("密码"));
		c.add(txtpass);
		c.add(bl);
		c.add(bg);
		setDefaultCloseOperation(EXIT_ON_CLOSE);
		setVisible(true);
		//注意：此处是匿名内部类
		bg.addActionListener(new ActionListener(){
			public void actionPerformed(ActionEvent e) {
				// TODO Auto-generated method stub
				System.exit(0);
			}
		}
		);
		//注意：此处是匿名内部类
		bl.addActionListener(new ActionListener(){
			public void actionPerformed(ActionEvent e) {
				// TODO Auto-generated method stub
				String name = txtname.getText();
				String pass = txtpass.getText();
				if(name.equals("tom")&&pass.equals("123")){
					System.out.println("登陆成功");
				} else{
					System.out.println("登录失败");
				}
			}
		}
		);
	}
	public static void main(String[] args) {
		new LoginFrame();
	}
}