自用，几种生成随机数的方法

1publicstaticString generateString(intlength)//参数为返回随机数的长度

2{

3StringBuffer sb =newStringBuffer();

4Random random =newRandom();

5for(inti = 0; i < length; i++) 

{6sb.append(numberChar.charAt(random.nextInt(numberChar.length())));

7}

8returnsb.toString();

9}

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