BigDecimal 計算工具類
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.ZERO;
}
if (null == v2) {
v2 = BigDecimal.ZERO;
}
return v1.multiply(v2);
}
public static BigDecimal divide(BigDecimal v1, BigDecimal v2) {
if(v2.compareTo(BigDecimal.ZERO) == 0)return new BigDecimal(0);
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) {
return new BigDecimal(0);
}
if (scale < 0) {
throw new IllegalArgumentException("精確度不能小於0");
}
return v1.divide(v2, scale, BigDecimal.ROUND_HALF_UP);
}
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 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 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);
}
}