Java使用BigDecimal精确运算浮点数

public class ArithmeticUtiles {

  
  // 默认除法运算精度
  private static final int DEF_DIV_SCALE = 10;

  // 这个类不能实例化
  private ArithmeticUtiles() {
  }

  
  public static double add(double v1, double v2) {
    BigDecimal b1 = new BigDecimal(Double.toString(v1));
    BigDecimal b2 = new BigDecimal(Double.toString(v2));
    return b1.add(b2).doublevalue();
  }

  
  public static double sub(double v1, double v2) {
    BigDecimal b1 = new BigDecimal(Double.toString(v1));
    BigDecimal b2 = new BigDecimal(Double.toString(v2));
    return b1.subtract(b2).doublevalue();
  }

  
  public static double mul(double v1, double v2) {
    BigDecimal b1 = new BigDecimal(Double.toString(v1));
    BigDecimal b2 = new BigDecimal(Double.toString(v2));
    return b1.multiply(b2).doublevalue();
  }

  
  public static double div(double v1, double v2) {
    return div(v1, v2, DEF_DIV_SCALE);
  }

  
  public static double div(double v1, double v2, int scale) {
    if (scale < 0) {
      throw new IllegalArgumentException("The scale must be a positive integer or zero");
    }
    BigDecimal b1 = new BigDecimal(Double.toString(v1));
    BigDecimal b2 = new BigDecimal(Double.toString(v2));
    return b1.divide(b2, scale, BigDecimal.ROUND_HALF_UP).doublevalue();
  }

  
  public static double round(double v, int scale) {
    if (scale < 0) {
      throw new IllegalArgumentException("The scale must be a positive integer or zero");
    }
    BigDecimal b = new BigDecimal(Double.toString(v));
    BigDecimal one = new BigDecimal("1");
    return b.divide(one, scale, BigDecimal.ROUND_HALF_UP).doublevalue();
  }

  
  public static float convertsToFloat(double v) {
    BigDecimal b = new BigDecimal(v);
    return b.floatValue();
  }

  
  public static int convertsToInt(double v) {
    BigDecimal b = new BigDecimal(v);
    return b.intValue();
  }

  
  public static long convertsToLong(double v) {
    BigDecimal b = new BigDecimal(v);
    return b.longValue();
  }

  
  public static double returnMax(double v1, double v2) {
    BigDecimal b1 = new BigDecimal(v1);
    BigDecimal b2 = new BigDecimal(v2);
    return b1.max(b2).doublevalue();
  }

  
  public static double returnMin(double v1, double v2) {
    BigDecimal b1 = new BigDecimal(v1);
    BigDecimal b2 = new BigDecimal(v2);
    return b1.min(b2).doublevalue();
  }

  
  public static int compareTo(double v1, double v2) {
    BigDecimal b1 = new BigDecimal(v1);
    BigDecimal b2 = new BigDecimal(v2);
    return b1.compareTo(b2);
  }

}

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