MathUtils.java
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package com.drp.mobliemall.utils;
import java.math.BigDecimal;
import java.text.DecimalFormat;
/**
* Created by Administrator on 2015/1/21.
* 数学运算帮助类
*/
public class MathUtils {
/**
* 将 doule 值精确到两位
* @param value
* @return
*/
public static double convertTwoBit(double value){
long l1 = Math.round(value * 100); //四舍五入
double ret = l1/100.0; //注意：使用 100.0 而不是 100
if(ret<=0)
ret = 0.00;
return ret;
}
public static double formatData(double value){
DecimalFormat df = new DecimalFormat("##.00");
return Double.parseDouble(df.format(value));
}
public static BigDecimal formatDataForBackBigDecimal(double value){
if(value > 0) {
DecimalFormat df = new DecimalFormat("##.00");
return new BigDecimal(df.format(value));
}
return new BigDecimal(0.00);
}
public static String formatDataForBackString(double value){
DecimalFormat df = new DecimalFormat("##.00");
return df.format(value).toString();
}
public static double getTotalAmount(double count,double price){
DecimalFormat df = new DecimalFormat("##.00");
return count*price;
}
}