精确计算工具类，提供加减乘除的计算

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package com.ljq.durian.common.util;   import java.math.BigDecimal; import java.math.MathContext; import java.math.RoundingMode;   /**  * 精确计算工具类，提供加减乘除的计算  *  * @author jqlin  */ public class CompuUtils {     /** 常量--0 */     public static final int ZERO = 0;     /** 常量--1 */     public static final int ONE = 1;     /** 常量-- -1 */     public static final int MINUS_ONE = -1;         /**      * 大小比较      *      * @param a      * @param b      * @return 返回1， 表示a大于b <br/>      *         返回0 ，表示a等于b <br/>      *         返回-1，表示a小于b      * @author jqlin      */     public static int compareTo(String a, String b) {         return new BigDecimal(a).compareTo(new BigDecimal(b));     }       /**      * 加法运算      *      * @param a 被加数      * @param b 加数      * @author jqlin      */     public static BigDecimal add(String a, String b) {         MathContext mc = new MathContext(20, RoundingMode.HALF_UP);         return new BigDecimal(a).add(new BigDecimal(b), mc);     }       /**      * 累加运算      *      * @param vals      * @return      * @author jqlin      */     public static int add(int... vals) {         if (vals == null || vals.length <= 0) {             return 0;         }           int sum = 0;         for (int val : vals) {             sum = sum + val;         }           return sum;     }       /**      * 累加运算      *      * @param vals      * @return      * @author jqlin      */     public static long add(long... vals) {         if (vals == null || vals.length <= 0) {             return 0L;         }           long sum = 0L;         for (long val : vals) {             sum = sum + val;         }           return sum;     }       /**      * 减法运算      *      * @param a 被减数      * @param b 减数      * @author jqlin      */     public static BigDecimal subtract(String a, String b) {         MathContext mc = new MathContext(20, RoundingMode.HALF_UP);         return new BigDecimal(a).subtract(new BigDecimal(b), mc);     }       /**      * 乘法运算      *      * @param a 被乘数      * @param b 乘数      * @author jqlin      */     public static BigDecimal multiply(String a, String b) {         MathContext mc = new MathContext(20, RoundingMode.HALF_UP);         return new BigDecimal(a).multiply(new BigDecimal(b), mc);     }       /**      * 除法运算      *      * @param a 被除数      * @param b 除数      * @author jqlin      */     public static BigDecimal divide(String a, String b) {         return new BigDecimal(a).divide(new BigDecimal(b), 20, BigDecimal.ROUND_HALF_UP);     }       public static void main(String[] args) {         System.out.println(divide("10", "4"));     } }