java实现四舍五入且指定小数位数

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package cn.cccc.demo;
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class MathUtil{
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    private MathUtil(){};
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    public static double round(double num,  int scale){
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       return Math.round(num * Math.pow(10,  scale)) / Math.pow(10, scale);
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    }
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}
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public class ThreadDemo {
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    public static void main(String[] args)   throws Exception{
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       System.out.println(MathUtil.round(19.46735,  2));
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    }
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}