【转】Java数字抽奖游戏核心代码
1. [代码][Java]代码
package com.luiszhang.test;
import java.util.Arrays;
/**
* NumberLotteryGame
* 一个简单的数字彩票游戏类
* @author LuisZhang
* 参考了core java 8th中的例3-7的设计思想
*/
public class NumberLotteryGame {
private int gamesNumber; // 生成游戏的数量，为以后多线程扩展做考虑
private int numbersLength; // 数字序列的总长度
private int winningNumbersLength; // 中奖的数字序列的长度
/**
* Constructor with three parameters
* 初始化3个参数的构造方法
* @param gamesNumber
* @param numbersLength
* @param winningNumbersLength
*/
public NumberLotteryGame(int gamesNumber, int numbersLength, int winningNumbersLength) {
this.gamesNumber = gamesNumber;
this.numbersLength = numbersLength;
this.winningNumbersLength = winningNumbersLength;
}
/**
* Generate a number Array
* 生成一个产生中奖序列所需的数字序列
* @param length 数字序列的长度
* @return numbers 产生的数字序列
*/
public static int[] generateNumberArray(int length) {
int[] numbers = new int[length];
for (int i = 0; i < numbers.length; i++) {
numbers[i] = i + 1;
}
return numbers;
}
/**
* Generate a winning number array
* 根据生成的数字序列，产生不重复的中奖数字序列
* @param length 中奖数字序列的长度
* @return result 中奖数字数组
*/
public int[] generateWinningNumberArray(int length) {
int[] numbers = NumberLotteryGame.generateNumberArray(numbersLength);
int[] result = new int[length];
int n = numbersLength;
// 该for循环为产生不重复的中奖序列的核心代码
for(int i = 0; i < result.length; i++) {
int r = (int) (Math.random() * n); // 随机产生一个从0——(n-1)的数字,Math.random()
// 随机产生一个[0, 1)范围的double型数值,
result[i] = numbers[r]; // 将该随机数字作为数组的下标，
// 将该下标对应的值赋给result[i]
numbers[r] = numbers[n - 1]; // 将numbers数组的numbers[n-1]的值，赋给刚已赋
// 值过的numbers[r]。
n--; // 将n-1,从而下一次循环产生的随机的原数组下标的范围从0——（n-1）-1,
// 保证了上一步中，已经赋值给数组中其他数的numbers[n-1]，不会在下次循环中给取
// 得，从而保证了产生的中奖数组result为不重复的。
}
return result;
}
/**
* Show winning NumberArray
* 显示中将数组美女
*/
public void showWinningNumberArray() {
int[] winningNumbers = this.generateWinningNumberArray(winningNumbersLength);
Arrays.sort(winningNumbers);http://www.enterdesk.com/special/sexygirl/
for(int r : winningNumbers) {
System.out.print(r + " ");
}
System.out.println();
}
/**
* @return the gamesNumber
*/
public int getGamesNumber() {
return gamesNumber;
}
/**
* @param gamesNumber the gamesNumber to set
*/
public void setGamesNumber(int gamesNumber) {
this.gamesNumber = gamesNumber;
}
/**
* @return the numbersLength
*/
public int getNumbersLength() {
return numbersLength;
}
/**
* @param numbersLength the numbersLength to set
*/
public void setNumbersLength(int numbersLength) {
this.numbersLength = numbersLength;
}
/**
* @return the winningNumbersLength
*/
public int getWinningNumbersLength() {
return winningNumbersLength;
}
/**
* @param winningNumbersLength the winningNumbersLength to set
*/
public void setWinningNumbersLength(int winningNumbersLength) {
this.winningNumbersLength = winningNumbersLength;
}
/**
* Main method
* 用于测试该类的main方法
* @param args
*/
public static void main(String[] args) {
int i = 20; // int i = Integer.parseInt(args[0]);
for(int j = 0; j < i; j++) {
NumberLotteryGame game1 = new NumberLotteryGame(1, 15, 7);
game1.showWinningNumberArray();
}
}
}
