Question

使用Java swing组件设计如下图像界面程序

Answer 1

package utils1;
import java.awt.Container;
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 AAA extends JFrame{
  private JTextField username;
     // 密码
     private JPasswordField password;
     // 小容器
     private JLabel jl1;
     private JLabel jl2;
     private JLabel jl3;
     private JLabel jl4;
     // 小按钮
     private JButton bu1;
     private JButton bu2;
     /*
      * 构造方法
      */
     public AAA() {
         // 设置窗口标题
         this.setTitle("登录练习");
         // 窗体组件初始化
         init();
         this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
         // 设置布局方式为绝对定位
         this.setLayout(null);
         this.setBounds(0, 0, 355, 265);
         // 窗体大小不能改变
         this.setResizable(false);
         // 居中显示
         this.setLocationRelativeTo(null);
         // 窗体可见
         this.setVisible(true);
     }
     /*
      * 初始化方法
      */
     public void init() {
         // 创建一个容器
         Container con = this.getContentPane();
         jl4 = new JLabel("",JLabel.CENTER);
         jl4.setBounds(15, 200, 300, 20);
         jl4.setVisible(false);
         jl1 = new JLabel();
         jl1.setBounds(0, 0, 355, 265);
         jl2 = new JLabel("姓名：");
         jl2.setBounds(40, 80, 60, 20);
         // 用户号码登录输入框
         username = new JTextField();
         username.setBounds(100, 80, 150, 20);
         jl3 = new JLabel("密码：");
         jl3.setBounds(40, 110, 60, 20);
         // 密码输入框
         password = new JPasswordField();
         password.setBounds(100, 110, 150, 20);
       
     
         // 按钮设定
         bu1 = new JButton("登录");
         bu1.setBounds(112, 150, 65, 20);
         // 给按钮添加1个事件
         bu1.addActionListener(new ActionListener() {
             @Override
             public void actionPerformed(ActionEvent e) {
                 String str=e.getActionCommand();
                 if("登录".equals(str)){
                     String getName =username.getText();
                     String pwd = password.getText();
//                   String getPwd =password.getText();
                      if(getName.equals("user")&&pwd.equals("psd")){
                       jl4.setText("姓名和密码正确！");
                       
                      }else{
                       jl4.setText("姓名和密码错误！");
                      
                      }
                      jl4.setVisible(true);
                 }
             }
         });
         bu2 = new JButton("取消");
         bu2.setBounds(177, 150, 65, 20);
         bu2.addActionListener(new ActionListener() {
    
    @Override
    public void actionPerformed(ActionEvent e) {
     // TODO Auto-generated method stub
      username.setText("");
                  password.setText("");
                  jl4.setText("");
                  jl4.setVisible(false);
    }
   });
         // 所有组件用容器装载
         jl1.add(jl2);
         jl1.add(jl3);
         jl1.add(bu1);
         jl1.add(bu2);
         con.add(jl1);
         con.add(username);
         con.add(password);
         con.add(jl4);
     }
     public static void main(String[] args) {
         // 实例化对象
         AAA qq = new AAA();
     }
}

Answer 2

import java.awt.event.MouseEvent;

import java.awt.event.MouseListener;

import javax.swing.JButton;

import javax.swing.JFrame;

import javax.swing.JLabel;

import javax.swing.JPasswordField;

import javax.swing.JTextField;

public class test extends JFrame {

public static void main(String[] args) {

test test = new test();

}

private JButton submit,cancel;

private JLabel password,username,info;

private JTextField textusername;

private JPasswordField textpassword;

public test() {

super("login");

super.setSize(300, 200);

super.setVisible(true);

super.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

this.setLocationRelativeTo(null);

this.init();

this.addinfo();

this.setLayout(null);

this.repaint();

}

//初始化界面

void init()

{

username = new JLabel("用户名：");

username.setBounds(10, 10, 80, 20);

this.add(username);

textusername = new JTextField();

textusername.setBounds(90,10,150,20);

this.add(textusername);

password = new JLabel("密码：");

password.setBounds(10, 40, 80, 20);

this.add(password);

textpassword = new JPasswordField();

textpassword.setBounds(90,40,150,20);

this.add(textpassword);

submit = new JButton("登 录");

submit.setBounds(60,80,60,20);

this.add(submit);

cancel = new JButton("取消");

cancel.setBounds(130,80,60,20);

this.add(cancel);

info = new JLabel("请输入用户名和密码");

info.setBounds(90, 100, 150, 20);

this.add(info);

}

//加入监听器

void addinfo() {

submit.addMouseListener(new MouseListener() {

@Override

public void mouseReleased(MouseEvent e) {

// TODO Auto-generated method stub

}

@Override

public void mousePressed(MouseEvent e) {

// TODO Auto-generated method stub

}

@Override

public void mouseExited(MouseEvent e) {

}

@Override

public void mouseEntered(MouseEvent e) {

// TODO Auto-generated method stub

}

@Override

public void mouseClicked(MouseEvent e) {

//用户名密码比较

if(textusername.getText().equals("123")&&textpassword.getText().equals("123"))

{

info.setText("用户名密码正确");

}

else

{

info.setText("用户名密码错误");

}

}

});

cancel.addMouseListener(new MouseListener() {

@Override

public void mouseReleased(MouseEvent e) {

// TODO Auto-generated method stub

}

@Override

public void mousePressed(MouseEvent e) {

// TODO Auto-generated method stub

}

@Override

public void mouseExited(MouseEvent e) {

// TODO Auto-generated method stub

}

@Override

public void mouseEntered(MouseEvent e) {

// TODO Auto-generated method stub

}

@Override

public void mouseClicked(MouseEvent e) {

textusername.setText("");

textpassword.setText("");

}

});

}

}