面向对象程序设计

GUI

课堂练习

编写GUI程序，完成登录界面的设计。

（课堂使用流式布局，课后修改成绝对布局）

img

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package com.pujunming.nsusoft.GUIDemo;

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

/**
 * Created by Intellij IDEA.
 *
 * @author Pu_Junming
 * @create 2022/11/17 14:17
 */

public class LoginFrame extends JFrame implements ActionListener {
    JTextField jTextField = new JTextField(20);
    JPasswordField jPasswordField = new JPasswordField(20);
    JButton button = new JButton("Login");
    JLabel label1 = new JLabel("用户名");
    JLabel label2 = new JLabel("密码");


    public LoginFrame(){
        this.setSize(700,200);
        this.setLocation(700,400);
        this.setVisible(true);
        this.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
        Container cont = this.getContentPane();
        cont.setLayout(new FlowLayout());
        cont.add(label1);
        cont.add(jTextField);
        cont.add(label2);
        cont.add(jPasswordField);
        cont.add(button);

        button.addActionListener(this);
    }

    public void actionPerformed(ActionEvent e){
        String name = jTextField.getText();
        String pwd = new String(jPasswordField.getPassword());
        if (name.equals("pua") && pwd.equals("ktv")){
            JOptionPane.showMessageDialog(this, "登录成功");
        }else {
            JOptionPane.showMessageDialog(this, "登录失败", "登录说明",JOptionPane.ERROR_MESSAGE);
        }
    }

    public static void main(String[] args) {
        new LoginFrame();
    }
}

绝对布局练习

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package com.pujunming.nsusoft.GUIDemo;

import javax.swing.*;

/**
 * Created by Intellij IDEA.
 *
 * @author Pu_Junming
 * @create 2022/11/17 15:12
 */

// 绝对布局
public class Examplel {
    public static void main(String[] args) {
        JFrame frame = new JFrame("Hello world!");
        frame.setSize(350,200);
        frame.setLocation(750,350);
        frame.setVisible(true);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        // 取消布局管理器
        frame.setLayout(null);
        //按钮
        JButton button1 = new JButton("Login");
        JButton button2 = new JButton("quit");
        //button位置
        button1.setBounds(40,60,100,30);
//        button1.setLocation(40,60);
//        button1.setSize(100,30);
        button2.setBounds(180,60,100,30);
        frame.add(button1);
        frame.add(button2);


    }
}