137 lines
3.5 KiB
Java
137 lines
3.5 KiB
Java
package com.xwbing.util;
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import com.xwbing.exception.UtilException;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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import java.math.BigDecimal;
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/**
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* 项目名称: boot-module-demo
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* 创建时间: 2017/11/21 10:36
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* 作者: xiangwb
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* 说明: 数字工具类
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*/
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public class DecimalUtil {
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private static final int DEF_DIV_SCALE = 10;
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private static final Logger LOGGER = LoggerFactory.getLogger(DecimalUtil.class);
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/**
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* 两个Double数相加
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*
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* @param v1
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* @param v2
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* @return Double
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*/
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public static Double add(Double v1, Double v2) {
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BigDecimal b1 = new BigDecimal(v1.toString());
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BigDecimal b2 = new BigDecimal(v2.toString());
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return b1.add(b2).doubleValue();
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}
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/**
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* 两个Double数相减
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*
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* @param v1
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* @param v2
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* @return Double
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*/
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public static Double sub(Double v1, Double v2) {
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BigDecimal b1 = new BigDecimal(v1.toString());
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BigDecimal b2 = new BigDecimal(v2.toString());
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return b1.subtract(b2).doubleValue();
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}
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/**
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* 两个Double数相乘
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*
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* @param v1
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* @param v2
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* @return Double
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*/
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public static Double mul(Double v1, Double v2) {
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BigDecimal b1 = new BigDecimal(v1.toString());
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BigDecimal b2 = new BigDecimal(v2.toString());
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return b1.multiply(b2).doubleValue();
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}
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/**
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* 两个Double数相除
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*
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* @param v1
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* @param v2
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* @return Double
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*/
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public static Double div(Double v1, Double v2) {
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BigDecimal b1 = new BigDecimal(v1.toString());
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BigDecimal b2 = new BigDecimal(v2.toString());
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return b1.divide(b2, DEF_DIV_SCALE, BigDecimal.ROUND_HALF_UP).doubleValue();
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}
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/**
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* 两个Double数相除，并保留scale位小数
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*
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* @param v1
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* @param v2
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* @param scale
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* @return Double
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*/
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public static Double div(Double v1, Double v2, int scale) {
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if (scale < 0){
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throw new UtilException("小数位数不能为负数");
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}
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BigDecimal b1 = new BigDecimal(v1.toString());
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BigDecimal b2 = new BigDecimal(v2.toString());
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return b1.divide(b2, scale, BigDecimal.ROUND_HALF_UP).doubleValue();
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}
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/**
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* 格式化double 四舍五入 保留n位小数
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*
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* @param v1
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* @param scale 小数位
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* @return
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*/
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public static Double formate(Double v1, int scale) {
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BigDecimal bg = new BigDecimal(v1);
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return bg.setScale(scale, BigDecimal.ROUND_HALF_UP).doubleValue();
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}
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/**
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* 不四舍五入保留n位小数
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*
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* @param scale 小数位
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* @param d
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* @return
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*/
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public static double decimalND(Double d, int scale) {
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BigDecimal bg = new BigDecimal(d);
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return bg.setScale(scale, BigDecimal.ROUND_DOWN).doubleValue();
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}
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/**
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* 保留n位小数 对非零舍弃部分前面的数字加1
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*
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* @param scale 小数位
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* @param d
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* @return
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*/
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public static double decimalNU(Double d, int scale) {
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BigDecimal bg = new BigDecimal(d);
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return bg.setScale(scale, BigDecimal.ROUND_UP).doubleValue();
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}
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public static void main(String[] args) {
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Double div = div((double) 9, (double) 8, 2);
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System.out.println(div);
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div = formate(div, 1);
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System.out.println(div);
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Double formate = formate(6.2, 1);
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System.out.println(formate);
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Double d = 1.11;
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int i = d.intValue();
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System.out.println(i);
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}
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}
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