How to implement a lottery number generator based on Java

1. Title

Big Lotto is a method of playing Chinese sports lottery. It is a result of careful research and extensive market research by the Sports Lottery Center of the State General Administration of Sports in order to adapt to the needs of market development and enrich the market structure of sports lottery. According to research, a new large-scale lottery method was launched nationwide on May 28, 2007. It's still running.

How to play: "Choose 5 from 35" in the front area + "Choose 2 from 12" in the back area

The basic gameplay is to select 5 non-repeating numbers from 135 random numbers, and select 2 from 112 random numbers. Do not repeat numbers. If it is exactly the same as the winning number, you win the first prize.

Implementation: Implement a big lottery number generator.

2. Problem-solving ideas

Create a class: SuperFun

Use SuperFun to inherit JFrame to build a form

The form mainly consists of three parts: the input part ;Display part;Generate number button

Generates a stream of pseudo-random numbers through instances of the Random class.

Method to randomly generate the first 5 numbers: getStartNumber()

Method to randomly generate the last 2 numbers: getEndNumber()

3. Detailed code explanation

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.ArrayList;
import java.util.Collections;
import java.util.List;
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: 大乐透
 *
 * @author xiaoxuzhu
 * @version 1.0
 *
 * <pre class="brush:php;toolbar:false">
 * 修改记录:
 * 修改后版本	        修改人		修改日期			修改内容
 * 2022/4/30.1	    xiaoxuzhu		2022/4/30		    Create
 * 

* @date 2022/4/30 */ public class SuperFun 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 { SuperFun frame = new SuperFun(); frame.setVisible(true); } catch (Exception e) { e.printStackTrace(); } } }); } /** * Create the frame. */ public SuperFun() { 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("大乐透号码生成器"); JPanel panel = new JPanel(); contentPane.add(panel, BorderLayout.NORTH); panel.setLayout(new GridLayout(1, 2, 5, 5)); JLabel label = new JLabel("请输入号码组数："); label.setFont(new Font("微软雅黑", Font.PLAIN, 18)); label.setHorizontalAlignment(SwingConstants.CENTER); panel.add(label); textField = new JTextField(); textField.setFont(new Font("微软雅黑", Font.PLAIN, 18)); panel.add(textField); textField.setColumns(10); JPanel buttonPanel = new JPanel(); contentPane.add(buttonPanel, BorderLayout.SOUTH); JButton button = new JButton("生成号码"); button.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { int times = Integer.parseInt(textField.getText());// 获得用户输入的需要生成的中奖号码个数 // 省略提示购买数量太多的代码 StringBuilder sb = new StringBuilder();// 创建字符串生成器对象 for (int i = 0; i < times; i++) { List startList = getStartNumber();// 获得前段号码的集合 List endList = getEndNumber();// 获得后段号码的集合 for (int m = 0; m < startList.size(); m++) { sb.append(startList.get(m));// 在字符串生成器中添加前段号码 } sb.append(" "); for (int n = 0; n < endList.size(); n++) { sb.append(endList.get(n));// 在字符串生成器中添加后段号码 } sb.append("\n"); } textArea.setText(sb.toString());// 在文本域中显示号码 } }); button.setFont(new Font("微软雅黑", Font.PLAIN, 18)); buttonPanel.add(button); JScrollPane scrollPane = new JScrollPane(); contentPane.add(scrollPane, BorderLayout.CENTER); textArea = new JTextArea(); textArea.setFont(new Font("微软雅黑", Font.PLAIN, 18)); scrollPane.setViewportView(textArea); } /** * 随机生成前段5个号码的方法 * * @return */ public List getStartNumber() { List list = new ArrayList(); // 创建前段号码集合 String luckyNumber = ""; for (int i = 1; i < 36; i++) { // 初始化前段号码集合 if (i < 10) { list.add("0" + i + " ");// 添加0~9的号码 } else { list.add("" + i + " ");// 添加大于9的号码 } } int roundIndex = 0; List luckylist = new ArrayList(); // 保存前段号码的List集合 for (int j = 0; j < 5; j++) { int amount = list.size(); // 获取前段号码的个数 Random r = new Random(); // 创建并实例化Random的对象 roundIndex = r.nextInt(amount); // 获取一个0到amount-1的随机数 luckyNumber = list.get(roundIndex); // 获取幸运数字 luckylist.add(luckyNumber); // 添加luckylist中 list.remove(roundIndex); // 移除刚刚产生的号码 } Collections.sort(luckylist); // 对前段号码进行排序 return luckylist; } /** * 随机生成后段2个号码的方法 * * @return */ public List getEndNumber() { List list = new ArrayList(); // 创建后段号码集合 String luckyNumber = ""; for (int i = 1; i < 13; i++) { // 初始化后段号码集合 if (i < 10) { list.add("0" + i + " ");// 添加0~9的号码 } else { list.add("" + i + " ");// 添加大于9的号码 } } int roundIndex = 0; List luckylist = new ArrayList(); // 保存后段号码的List集合 for (int j = 0; j < 2; j++) { int amount = list.size(); // 获取后段号码的个数 Random r = new Random(); // 创建并实例化Random的对象 roundIndex = r.nextInt(amount); // 获取一个0到amount-1的随机数 luckyNumber = list.get(roundIndex); // 获取幸运数字 luckylist.add(luckyNumber); // 添加luckylist中 list.remove(roundIndex); // 移除刚刚产生的号码 } Collections.sort(luckylist); // 对后段号码进行排序 return luckylist; } }

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