JAVA-登录

package com.itheima;

import javax.swing.*;

public class JFrame05 {
    public static void main(String[] args) {
        JFrame jf=new JFrame();
        jf.setTitle("用户登录");
        jf.setSize(400,300);
        jf.setDefaultCloseOperation(3);
        jf.setLocationRelativeTo(null);
        jf.setAlwaysOnTop(true);
        jf.setLayout(null);        //取消窗体的默认布局

        //显示用户名文本
        JLabel usernameLabel=new JLabel("用户名");
        usernameLabel.setBounds(50,50,50,20);
        jf.add(usernameLabel);

        //用户名输入框
        JTextField usernameField = new JTextField();
        usernameField.setBounds(150,50,180,20);
        jf.add(usernameField);


        //显示密码文本
        JLabel passwordLabel=new JLabel("密码");
        passwordLabel.setBounds(50,100,50,20);
        jf.add(passwordLabel);

        //密码输入框
//        JTextField passwordField = new JTextField();
//        passwordField.setBounds(150,100,180,20);
//        jf.add(passwordField);

        JPasswordField passwordField = new JPasswordField();  //密码输入框用JPasswordField 加密显示
        passwordField.setBounds(150,100,180,20);
        jf.add(passwordField);


        //登录按钮
        JButton LoginButton=new JButton("登录");
        LoginButton.setBounds(50,200,280,20);
        jf.add(LoginButton);





        //添加按钮到窗体中
        jf.setVisible(true);


    }
}