随机生成双色球彩票红，蓝数字

最新推荐文章于 2024-02-23 09:58:39 发布

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这个Java程序创建了两个数组，分别代表双色球的红球池和蓝球池，然后通过getFullString方法填充数组。doubleBall方法用于生成随机的6个红球和1个蓝球，避免重复，并进行排序。最后，程序打印出生成的彩票号码。

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public class DoubleBallDemo2 {

	public static void main(String[] args) {
		String [] redPool = new String[33]; //红球池
		String [] bluePool = new String[16];//蓝球池
		redPool 				=	getFullString(redPool);
		bluePool 				=	getFullString(bluePool);
		
		System.out.println(Arrays.toString(doubleBall(redPool,bluePool)));
//		System.out.println(Arrays.toString(bluePool));
		
	}
	
	public static String[] getFullString( String [] ary)
	{
		for ( int i = 0; i < ary.length; i++ )
		{			
			char [] ch	 		= {'0','0'};
			String s 			= Integer.toString(i+1); //字符串转字符
			char [] num 		=	s.toCharArray(); //字符串转成数组 "1" -> {'1'}
			System.arraycopy(num, 0, ch, ch.length-num.length, num.length);
			String ball 		= new String(ch);
			ary[i] 			=	ball;
		}
		return ary;
	}
	
	public static String [] doubleBall( String [] redPool, String [] bluePool )
	{
		boolean [] used = new boolean[redPool.length]; //使用的球存放在这里，标记TRUE,默认FALSE
		String [] all 		 =	 new String[7]; //存放红，蓝球
		Random 	r	 = new Random();
		for ( int i = 0; i < 6; i++ )
		{
			int  rdnum;
			do{
			
				rdnum 	 = r.nextInt(redPool.length);
				
			
			}while ( used[rdnum] );
			all[i]		 	 = redPool[rdnum];
			used[rdnum] = true;			
		}
		all[all.length-1]  = "99";
		Arrays.sort(all);
		all[all.length-1] = bluePool[r.nextInt(bluePool.length)];
		return all;
	}
}