random seed什么意思

 

简而言之，加种子，生成的值是相等的，不加种子，是以当前系统时钟为种子的，生成的随机数是不相等的。

 

refurl:http://blog.sina.com.cn/s/blog_64d5f4bd0100h0zz.html

 

 

 

另外，放一个生成不重复的7位数的算法：

String arr[]={"a","b","c","d","e","f","g","h","i","j","k","l","m","n","o","p","q","i"
				,"j","k","l","m","n","o","p","q","r","s","t","u","v","w","x","y","z"
				,"A","B","C","D","E","F","G","H","I","J","K","L","M","N","O","P","Q","I"
				,"J","K","L","M","N","O","P","Q","R","S","T","U","V","W","X","Y","Z"
				,"!","@","#","$","%","^","&","*"};
		String myRandom="";
		for(int i=0;i<7;i++){
			int lotteryNumber=new Random().nextInt(60);
			myRandom=myRandom+arr[lotteryNumber];
		}
		System.out.println("myRandom:"+myRandom);

 

7位不重复的数字参考URL：

http://bbs.csdn.net/topics/320148022