先看效果

1.建立包com.QQUI0819

2.在包下建立类

LoginAction

package com.QQUI0819;import javax.swing.*;
import java.awt.event.*;
//首先，编写按钮癿监听器实现类
public class LoginAction implementsActionListener {private int count=0;//当前为null,创建后指向界面输入框private JTextField ulName;private JTextField ulpass;//创建时，输入界面类中输入框public LoginAction(JTextField ulName,JTextField ulpass ){this.ulName=ulName;this.ulpass=ulpass;}//实现接口中的方法//当劢作发生时，这个方法执行public void actionPerformed(ActionEvent e) {//点击时，就取得界面输入框癿内容//此时癿jtf，指向是界面上那个输入框String o=ulName.getText();String p=ulName.getText();System.out.println("账号输入的是 "+o);System.out.println("密码输入的是 "+p);if(o.equals("saygood") &&(p.equals("123456"))){//如果输入正确，弹出新界面JFrame jf=new JFrame();jf.setTitle("登陆成功");jf.setSize(300,400);jf.setLocationRelativeTo(null);jf.setVisible(true);} else {//如果输入正确，弹出新界面JFrame jf=new JFrame();jf.setTitle("登陆失败");jf.setSize(300,100);JButton b1 = new JButton("登陆失败，账号和密码不匹配，请重新登陆");jf.add(b1);jf.setLocationRelativeTo(null);jf.setVisible(true);}}
}

QQ.java

package com.QQUI0819;import java.awt.Color;
import java.awt.Container;
import java.awt.Cursor;
import java.awt.Font;
import java.awt.Image;
import java.util.ArrayList;import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JCheckBox;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JPasswordField;
import javax.swing.JRootPane;
import javax.swing.JTextField;public class QQ extends JFrame{//用户名private JTextField ulName;//密码private JPasswordField ulPasswd;//小容器private JLabel j1;private JLabel j2;private JLabel j3;private JLabel j4;JLabel j5;JLabel j6;//小按钮private JButton b1;//复选框private JCheckBox c1;private JCheckBox c2;JPanel jp;/*** 初始化QQ登录页面* */public QQ(){//设置登录窗口标题this.setTitle("QQ登录");//去掉窗口的装饰(边框)//采用指定的窗口装饰风格this.getRootPane().setWindowDecorationStyle(JRootPane.NONE);//窗体组件初始化init();this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);//设置布局为绝对定位this.setLayout(null);this.setBounds(0, 0, 355, 265);//设置窗体的图标Image img0 = new ImageIcon("C:\\Users\\lenovo\\Pictures\\Java题\\qq1.jpg").getImage();this.setIconImage(img0);//窗体大小不能改变this.setResizable(false);//居中显示this.setLocationRelativeTo(null);//窗体显示this.setVisible(true);}/*** 窗体组件初始化* */public void init(){//创建一个容器,其中的图片大小和setBoundsjp = new JPanel();Container container = this.getContentPane();j1 = new JLabel();//设置背景色Image img1 = new ImageIcon("C:\\\\Users\\\\lenovo\\\\Pictures\\\\Java题\\\\qq.jpg").getImage();j1.setIcon(new ImageIcon(img1));j1.setBounds(0, 0, 355, 90);//qq头像设定j2 = new JLabel();Image img2 = new ImageIcon("C:\\Users\\lenovo\\Pictures\\Java题\\qq1.jpg").getImage();j2.setIcon(new ImageIcon(img2));j2.setBounds(150, 40, 60, 60);//用户名输入框ulName = new JTextField();ulName.setBounds(100, 100, 150, 20);//注册账号j3 = new JLabel("账号");j3.setBounds(260, 100, 70, 20);//密码输入框ulPasswd = new JPasswordField();ulPasswd.setBounds(100, 130, 150, 20);j4= new JLabel("密码");j4.setBounds(260, 130, 70, 20);j5= new JLabel("注册账号");j5.setBounds(180, 155, 80, 15);j6= new JLabel("忘记密码");j6.setBounds(250, 155, 80, 15);//记住密码c1 = new JCheckBox("记住密码");c1.setBounds(20, 155, 80, 15);//自动登陆c2 = new JCheckBox("自动登陆");c2.setBounds(100, 155, 80, 15);//登陆按钮b1 = new JButton("登录");//设置字体和颜色和手形指针b1.setFont(new Font("宋体", Font.PLAIN, 12));b1.setForeground(Color.black);b1.setCursor(Cursor.getPredefinedCursor(Cursor.HAND_CURSOR));b1.setBounds(20, 200, 300, 20);JLabel jl3=new JLabel("状态：");jp.add(jl3);jl3.setBounds(10, 100, 30, 10);JComboBox<String> jcb1=new JComboBox();jp.add(jcb1);jcb1.setBounds(10, 100,30, 10);jcb1.addItem("在线");jcb1.addItem("隐身") ;jcb1.addItem("追剧中") ;jcb1.addItem("吃瓜") ;jcb1.addItem("读书中") ;//给按钮添加//所有组件用容器装载this.add(j1);this.add(j2);this.add(j3);this.add(j4);this.add(j5);this.add(j6);this.add(c1);this.add(c2);this.add(b1);add(jcb1);add(jcb1);add(jl3);//创建监听器对象，幵加给按钮LoginAction lo=new LoginAction(ulName,ulPasswd);b1.addActionListener(lo);container.add(j1);container.add(ulName);container.add(ulPasswd);}public static void main(String[] args) {new QQ();}
}