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();
}
