基於Java實現簡易的七星彩號碼生成器

package com.xiaoxuzhu;
import java.awt.BorderLayout;
import java.awt.EventQueue;
import java.awt.Font;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.Random;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.JTextField;
import javax.swing.SwingConstants;
import javax.swing.UIManager;
import javax.swing.border.EmptyBorder;
/**
 * Description: 七星碼生成器
 *
 * @author xiaoxuzhu
 * @version 1.0
 *
 * <pre>
 * 修改記錄:
 * 修改後版本	        修改人		修改日期			修改內容
 * 2022/4/30.1	    xiaoxuzhu		2022/4/30		    Create
 * </pre>
 * @date 2022/4/30
 */
public class SevenStar extends JFrame {

    /**
     *
     */
    private static final long serialVersionUID = 6787592245621788484L;
    private JPanel contentPane;
    private JTextField textField;
    private JTextArea textArea;

    /**
     * Launch the application.
     */
    public static void main(String[] args) {
        try {
            UIManager
                    .setLookAndFeel("com.sun.java.swing.plaf.nimbus.NimbusLookAndFeel");
        } catch (Throwable e) {
            e.printStackTrace();
        }
        EventQueue.invokeLater(new Runnable() {
            public void run() {
                try {
                    SevenStar frame = new SevenStar();
                    frame.setVisible(true);
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        });
    }

    /**
     * Create the frame.
     */
    public SevenStar() {
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setBounds(100, 100, 450, 300);
        contentPane = new JPanel();
        contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
        contentPane.setLayout(new BorderLayout(0, 0));
        setContentPane(contentPane);
        setTitle("七星彩號碼生成器");

        JPanel panel = new JPanel();
        contentPane.add(panel, BorderLayout.NORTH);
        panel.setLayout(new GridLayout(1, 2, 5, 5));

        JLabel label = new JLabel("請輸入號碼組數：");
        label.setFont(new Font("微軟雅黑", Font.PLAIN, 18));
        label.setHorizontalAlignment(SwingConstants.CENTER);
        panel.add(label);

        textField = new JTextField();
        textField.setFont(new Font("微軟雅黑", Font.PLAIN, 18));
        panel.add(textField);
        textField.setColumns(10);

        JPanel buttonPanel = new JPanel();
        contentPane.add(buttonPanel, BorderLayout.SOUTH);

        JButton button = new JButton("生成號碼");
        button.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                int times = Integer.parseInt(textField.getText());// 獲得用戶輸入的需要生成的中獎號碼個數
                
                StringBuilder sb = new StringBuilder();// 利用StringBuilder類保存彩票中獎號碼
                for (int i = 0; i < times; i++) {
                    int number = new Random().nextInt((int) Math.pow(10, 7));// 生成隨機數
                    String luckNumber = "" + number;
                    while (luckNumber.length() < 7) {
                        luckNumber = "0" + luckNumber;// 如果隨機數長度不夠7位用0補齊
                    }
                    sb.append(luckNumber + "\n");
                }
                textArea.setText(sb.toString());// 顯示生成的中獎號碼
            }
        });
        button.setFont(new Font("微軟雅黑", Font.PLAIN, 18));
        buttonPanel.add(button);

        JScrollPane scrollPane = new JScrollPane();
        contentPane.add(scrollPane, BorderLayout.CENTER);

        textArea = new JTextArea();
        textArea.setFont(new Font("微軟雅黑", Font.PLAIN, 18));
        scrollPane.setViewportView(textArea);
    }

}