Java数学工具类MathUtil详解

本文实例为大家分享了Java数学工具类MathUtil的具体代码，供大家参考，具体内容如下

package cn.xbz.util.math;
 
import java.math.BigDecimal;
 

public class XMathUtil {
  
  private static final int DEF_DIV_SCALE = 2;
 
  
  public static BigDecimal add(BigDecimal v1, BigDecimal v2) {
    if (null == v1) {
      v1 = BigDecimal.ZERO;
    }
    if (null == v2) {
      v2 = BigDecimal.ZERO;
    }
    return v1.add(v2);
  }
 
  
  public static BigDecimal subtract(BigDecimal v1, BigDecimal v2) {
    if (null == v1) {
      v1 = BigDecimal.ZERO;
    }
    if (null == v2) {
      v2 = BigDecimal.ZERO;
    }
    return v1.subtract(v2);
  }
 
  
  public static BigDecimal multiply(BigDecimal v1, BigDecimal v2) {
    if (null == v1) {
      v1 = BigDecimal.ONE;
    }
    if (null == v2) {
      v2 = BigDecimal.ONE;
    }
    return v1.multiply(v2);
  }
 
  
  public static BigDecimal divide(BigDecimal v1, BigDecimal v2) {
    return v1.divide(v2, DEF_DIV_SCALE, BigDecimal.ROUND_HALF_UP);
  }
 
  
  public static BigDecimal divide(BigDecimal v1, BigDecimal v2, Integer scale) {
    if (null == v1) {
      return BigDecimal.ZERO;
    }
    if (null == v2) {
      v2 = BigDecimal.ONE;
    }
 
    if (v2.compareTo(BigDecimal.ZERO) == 0) {
      throw new IllegalArgumentException("除数不能为0");
    }
 
    if (scale < 0) {
      throw new IllegalArgumentException("精确度不能小于0");
    }
 
    return v1.divide(v2, scale, BigDecimal.ROUND_HALF_UP);
  }
 
  
  public static String add(String v1, String v2) {
    if (isBlank(v1)) {
      v1 = "0";
    }
    if (isBlank(v2)) {
      v2 = "0";
    }
    BigDecimal b1 = new BigDecimal(v1.trim());
    BigDecimal b2 = new BigDecimal(v2.trim());
    return String.valueOf(add(b1, b2));
  }
 
 
  
  public static String subtract(String v1, String v2) {
    if (isBlank(v1)) {
      v1 = "0";
    }
    if (isBlank(v2)) {
      v2 = "0";
    }
    BigDecimal b1 = new BigDecimal(v1.trim());
    BigDecimal b2 = new BigDecimal(v2.trim());
    return String.valueOf(subtract(b1, b2));
  }
 
  
  public static String multiply(String v1, String v2) {
    if (isBlank(v1)) {
      v1 = "1";
    }
    if (isBlank(v2)) {
      v2 = "1";
    }
    BigDecimal b1 = new BigDecimal(v1.trim());
    BigDecimal b2 = new BigDecimal(v2.trim());
    return String.valueOf(multiply(b1, b2));
  }
 
  
  public static String divide(String v1, String v2) {
    return divide(v1, v2, DEF_DIV_SCALE);
  }
 
  
  public static String divide(String v1, String v2, Integer scale) {
    if (null == v1) {
      return "0";
    }
    if (null == v2) {
      v2 = "1";
    }
    BigDecimal b1 = new BigDecimal(v1.trim());
    BigDecimal b2 = new BigDecimal(v2.trim());
    return String.valueOf(divide(b1, b2, scale));
  }
 
  
  public static BigDecimal sum(BigDecimal v1, BigDecimal... valList) {
    if (null == v1) {
      v1 = BigDecimal.ZERO;
    }
    if (null == valList || valList.length == 0) {
      return v1;
    }
    for (BigDecimal val : valList) {
      if (null != val) {
 v1 = v1.add(val);
      }
    }
    return v1;
  }
 
  
  public static String sum(String v1, String... valList) {
    if (isBlank(v1)) {
      v1 = "0";
    }
    if (null == valList || valList.length == 0) {
      return v1;
    }
    BigDecimal b1 = new BigDecimal(v1.trim());
    for (String val : valList) {
      if (!isBlank(val)) {
 b1 = add(b1, new BigDecimal(val.trim()));
      }
    }
    return String.valueOf(b1);
  }
 
  
  public static BigDecimal avg(BigDecimal... valList) {
    if (null != valList && valList.length != 0) {
      return divide(sum(BigDecimal.ZERO, valList), new BigDecimal(valList.length));
    }
    return BigDecimal.ZERO;
  }
 
  
  public static String avg(String... valList) {
    if (null != valList && valList.length != 0) {
      return divide(sum("0", valList), String.valueOf(valList.length));
    }
    return "0";
  }
 
  
  public static BigDecimal max(BigDecimal v1, BigDecimal... valList) {
    BigDecimal max = v1;
    if (null == valList || valList.length == 0) {
      return max;
    }
    for (BigDecimal val : valList) {
      if (null != val && val.compareTo(max) > 0) {
 max = val;
      }
    }
    return max;
  }
 
  
  public static BigDecimal maxArr(BigDecimal... valList) {
    if (null == valList || valList.length == 0) {
      return null;
    }
 
    return max(valList[0], valList);
  }
 
  
  public static BigDecimal min(BigDecimal v1, BigDecimal... valList) {
    BigDecimal min = v1;
    if (null == valList || valList.length == 0) {
      return min;
    }
    for (BigDecimal val : valList) {
      if (null != val && val.compareTo(min) < 0) {
 min = val;
      }
    }
    return min;
  }
 
  
  public static BigDecimal minArr(BigDecimal... valList) {
    if (null == valList || valList.length == 0) {
      return null;
    }
    return min(valList[0], valList);
  }
 
  
  public static String max(String v1, String... valList) {
    if (isBlank(v1)) {
      return null;
    }
    if (null == valList || valList.length == 0) {
      return v1;
    }
    BigDecimal maxBd = new BigDecimal(v1.trim());
 
    for (String val : valList) {
      if (!isBlank(val) && new BigDecimal(val).compareTo(maxBd) > 0) {
 maxBd = new BigDecimal(val);
      }
    }
    return String.valueOf(maxBd);
  }
 
  
  public static String maxArr(String... valList) {
    if (null == valList || valList.length == 0) {
      return null;
    }
    return max(valList[0], valList);
  }
 
  
  public static String min(String v1, String... valList) {
    if (isBlank(v1)) {
      return null;
    }
    if (null == valList || valList.length == 0) {
      return v1;
    }
    BigDecimal minBd = new BigDecimal(v1.trim());
 
    for (String val : valList) {
      if (!isBlank(val) && new BigDecimal(val).compareTo(minBd) < 0) {
 minBd = new BigDecimal(val);
      }
    }
    return String.valueOf(minBd);
  }
 
  
  public static String minArr(String... valList) {
    if (null == valList || valList.length == 0) {
      return null;
    }
    return min(valList[0], valList);
  }
 
  
  private static boolean isBlank(String str) {
    return null == str || str.trim().length() == 0;
  }
}

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