FindBugs问题：RV_ABSOLUTE_VALUE_OF_RANDOM_INT

FindBugs扫描出的问题：

RV: Bad attempt to compute absolute value of signed random integer (RV_ABSOLUTE_VALUE_OF_RANDOM_INT)

This code generates a random signed integer and then computes the absolute value of that random integer. If the number returned by the random number generator is Integer.MIN_VALUE, then the result will be negative as well (since Math.abs(Integer.MIN_VALUE) == Integer.MIN_VALUE). (Same problem arised for long values as well).

问题代码：

Random rd = new Random();
Math.abs(rd.nextInt());

解决办法：

使用random.nextInt(Integer.MAX_VALUE)获取从0到MAX_VALUE的数字-1

修改后代码：

Random rd = new Random();
Math.abs(rd.nextInt(Integer.MAX_VALUE));