【Java】利用Swing實現登錄頁面

Main.java

class Main {

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

FrameTest.java

package com.company;

import javax.swing.*;
import java.awt.*;

class FrameTest {
    JFrame frame =new JFrame("登錄");
    Container c = frame.getContentPane();//創建視圖
    JLabel userLabel=new JLabel("用戶名");
    JTextField username= new JTextField();
    JLabel passwdLabel=new JLabel("密碼");
    JPasswordField password=new JPasswordField();
    JButton okbutton = new JButton("確定");
    JButton cancelbttton = new JButton("取消");
    public FrameTest(){
        frame.setBounds(600, 200, 300, 220);//設置窗體位置&大小
        c.setLayout(new BorderLayout());//設置視圖的布局
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);//設置❌功能
        init();//初始化，把控件放在布局里
        frame.setVisible(true);//設置窗體可見
    }
    public void init(){
//        標題——上方
        JPanel titlePanel =new JPanel();//創建一個放置標題的面板
        titlePanel.setLayout(new FlowLayout());
        titlePanel.add(new JLabel("歡哥OS"));
        c.add(titlePanel, "North");//加入視圖中
//        輸入框——中間
        JPanel inputPanel =new JPanel();
        inputPanel.setLayout(null);
        userLabel.setBounds(50, 20, 50, 20);//標簽位置
        passwdLabel.setBounds(50, 60, 50, 20);
        inputPanel.add(userLabel);
        inputPanel.add(passwdLabel);
        username.setBounds(110, 20, 120, 20);
        password.setBounds(110, 60, 120, 20);
        inputPanel.add(username);
        inputPanel.add(password);
        c.add(inputPanel, "Center");
//        按鈕底部
        JPanel buttonPanel =new JPanel();
        buttonPanel.setLayout(new FlowLayout());
        buttonPanel.add(okbutton);
        buttonPanel.add(cancelbttton);
        c.add(buttonPanel, "South");
    }
}