Java 记录随机数几种方法，自用

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1 public static String generateString(int length) // 参数为返回随机数的长度
2     {
3         StringBuffer sb = new StringBuffer();
4         Random random = new Random();
5         for (int i = 0; i < length; i++) {
6             sb.append(numberChar.charAt(random.nextInt(numberChar.length())));
7         }
8         return sb.toString();
9     }

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String sixRandom =(int)((Math.random()*9+1)*100000)+"";

.deleteCharAt(length-1);
//删除最后一个字符

/**
	 * 随机产生n个10以内的数字字符串
	 * @param n
	 * @return
	 */
	public static String random(int n){
		if(n <= 0)
			return "";
		StringBuilder builder = new StringBuilder();
		for(int i=0;i<n;i++) {
			int number = new Random().nextInt(10);
			builder.append(number);
		}
		return builder.toString();
	}