Math常用的数学运算(包括取整、取绝对值、保留几位小数等)

System.out.println(Math.max(1,2));

System.out.println(Math.min(1,2));

System.out.println(Math.abs(-15.6));

System.out.println(Math.round(15.6));

System.out.println(Math.floor(15.6));

System.out.println(Math.random());

System.out.println(Math.pow(2,3));

System.out.println(SplitAndRound(2.3659,2));

    /**
     * 为num保留n位小数
     * @param num
     * @param n
     * @return
     */
    public static double SplitAndRound(double num, int n) {
        num = num * Math.pow(10, n);
        return (Math.round(num)) / (Math.pow(10, n));
    }