com.centit.support.algorithm.GeneralAlgorithm Maven / Gradle / Ivy
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java 常用工具类,作为 apache-commons的补充
package com.centit.support.algorithm;
import org.apache.commons.lang3.ObjectUtils;
import java.math.RoundingMode;
import java.util.Collection;
import java.util.Iterator;
/**
* Created by codefan on 17-9-7.
* @author codefan
*/
@SuppressWarnings("unused")
public abstract class GeneralAlgorithm {
private GeneralAlgorithm() {
throw new IllegalAccessError("Utility class");
}
public static T nvl(T obj, T obj2){
return obj==null ? obj2 : obj;
}
public static T nvl2(Object obj, T obj2, T obj3){
return obj==null ? obj3 : obj2;
}
public static int compareTwoObject(Object operand , Object operand2){
if (operand == null && operand2 == null) {
return 0;
}
if(operand == null ){
return -1;
}
if(operand2 == null ){
return 1;
}
if (NumberBaseOpt.isNumber(operand)
&& NumberBaseOpt.isNumber(operand2)) {
return NumberBaseOpt.castObjectToDouble(operand).
compareTo( NumberBaseOpt.castObjectToDouble(operand2));
}
return ObjectUtils.compare(
StringBaseOpt.objectToString(operand),
StringBaseOpt.objectToString(operand2));
}
/** int compare(final T c1, final T c2)
* 等价于 ObjectUtils.compare
* @param 比较对对象类型
* @param l1 参数1
* @param l2 参数2
* @return 返回比较值 0 相等 1 大于 -1 小于
* @see org.apache.commons.lang3.ObjectUtils compare
*/
public static > int compareTwoComparableObject(T l1 , T l2){
return (l1 == null && l2 == null) ? 0:(
l1 == null ? -1 :(
l2 == null ? 1 :(
l1.compareTo(l2)
)
)
);
}
private static int getJavaTypeOrder(Object a){
switch (ReflectionOpt.getJavaTypeName(a.getClass())) {
case "int":
case "Integer":
return 1;
case "long":
case "Long":
return 2;
case "float":
case "Float":
return 3;
case "double":
case "Double":
return 4;
case "BigInteger":
return 5;
case "BigDecimal":
return 6;
case "String":
return 10;
default:
return 100;
}
}
/**
* 将两个对象加+起来，可能是数字相加，也可能是字符串连接
* @param a object1
* @param b object2
* @return 相加结果
*/
public static Object addTwoObject(Object a,Object b){
if(a==null)
return b;
if(b==null)
return a;
if( a instanceof java.lang.Number && b instanceof java.lang.Number) {
int retType = Math.max(getJavaTypeOrder(a), getJavaTypeOrder(b));
switch (retType){
case 1:
return NumberBaseOpt.castObjectToInteger(a) +
NumberBaseOpt.castObjectToInteger(b);
case 2:
return NumberBaseOpt.castObjectToLong(a) +
NumberBaseOpt.castObjectToLong(b);
case 3:
return NumberBaseOpt.castObjectToFloat(a) +
NumberBaseOpt.castObjectToFloat(b);
case 5:
return NumberBaseOpt.castObjectToBigInteger(a).add(
NumberBaseOpt.castObjectToBigInteger(b));
case 6:
return NumberBaseOpt.castObjectToBigDecimal(a).add(
NumberBaseOpt.castObjectToBigDecimal(b));
case 4:
default:
return NumberBaseOpt.castObjectToDouble(a) +
NumberBaseOpt.castObjectToDouble(b);
}
}
return StringBaseOpt.concat(
StringBaseOpt.castObjectToString(a),
StringBaseOpt.castObjectToString(b));
}
public static Object subtractTwoObject(Object a,Object b){
if(b==null)
return a;
if(a==null)
a = new Integer(0);
if( a instanceof java.lang.Number && b instanceof java.lang.Number) {
int retType = Math.max(getJavaTypeOrder(a), getJavaTypeOrder(b));
switch (retType){
case 1:
return NumberBaseOpt.castObjectToInteger(a) -
NumberBaseOpt.castObjectToInteger(b);
case 2:
return NumberBaseOpt.castObjectToLong(a) -
NumberBaseOpt.castObjectToLong(b);
case 3:
return NumberBaseOpt.castObjectToFloat(a) -
NumberBaseOpt.castObjectToFloat(b);
case 5:
return NumberBaseOpt.castObjectToBigInteger(a).subtract(
NumberBaseOpt.castObjectToBigInteger(b));
case 6:
return NumberBaseOpt.castObjectToBigDecimal(a).subtract(
NumberBaseOpt.castObjectToBigDecimal(b));
case 4:
default:
return NumberBaseOpt.castObjectToDouble(a) -
NumberBaseOpt.castObjectToDouble(b);
}
}
return a;
}
public static Object multiplyTwoObject(Object a,Object b){
if(a==null)
return b;
if(b==null)
return a;
if( a instanceof java.lang.Number && b instanceof java.lang.Number) {
int retType = Math.max(getJavaTypeOrder(a), getJavaTypeOrder(b));
switch (retType){
case 1:
return NumberBaseOpt.castObjectToInteger(a) *
NumberBaseOpt.castObjectToInteger(b);
case 2:
return NumberBaseOpt.castObjectToLong(a) *
NumberBaseOpt.castObjectToLong(b);
case 3:
return NumberBaseOpt.castObjectToFloat(a) *
NumberBaseOpt.castObjectToFloat(b);
case 5:
return NumberBaseOpt.castObjectToBigInteger(a).multiply(
NumberBaseOpt.castObjectToBigInteger(b));
case 6:
return NumberBaseOpt.castObjectToBigDecimal(a).multiply(
NumberBaseOpt.castObjectToBigDecimal(b));
case 4:
default:
return NumberBaseOpt.castObjectToDouble(a) *
NumberBaseOpt.castObjectToDouble(b);
}
}
return StringBaseOpt.concat(
StringBaseOpt.castObjectToString(a),
StringBaseOpt.castObjectToString(b));
}
public static Object divideTwoObject(Object a, Object b){
if(a==null || b==null)
return null;
if( a instanceof java.lang.Number && b instanceof java.lang.Number) {
int retType = Math.max(getJavaTypeOrder(a), getJavaTypeOrder(b));
switch (retType){
case 1:
return NumberBaseOpt.castObjectToInteger(a) /
NumberBaseOpt.castObjectToInteger(b);
case 2:
return NumberBaseOpt.castObjectToLong(a) /
NumberBaseOpt.castObjectToLong(b);
case 3:
return NumberBaseOpt.castObjectToFloat(a) /
NumberBaseOpt.castObjectToFloat(b);
case 5:
return NumberBaseOpt.castObjectToBigInteger(a).divide(
NumberBaseOpt.castObjectToBigInteger(b));
case 6:
//默认采用8位有效数字
return NumberBaseOpt.castObjectToBigDecimal(a).divide(
NumberBaseOpt.castObjectToBigDecimal(b),8, RoundingMode.HALF_EVEN);
case 4:
default:
return NumberBaseOpt.castObjectToDouble(a) /
NumberBaseOpt.castObjectToDouble(b);
}
}
return a;
}
public static Object modTwoObject(Object a, Object b){
if(a==null || b==null)
return null;
if( a instanceof java.lang.Number && b instanceof java.lang.Number) {
int retType = Math.max(getJavaTypeOrder(a), getJavaTypeOrder(b));
switch (retType){
case 1:
return NumberBaseOpt.castObjectToInteger(a) %
NumberBaseOpt.castObjectToInteger(b);
case 2:
return NumberBaseOpt.castObjectToLong(a) %
NumberBaseOpt.castObjectToLong(b);
case 3:
return NumberBaseOpt.castObjectToFloat(a) %
NumberBaseOpt.castObjectToFloat(b);
case 5:
return NumberBaseOpt.castObjectToBigInteger(a).mod(
NumberBaseOpt.castObjectToBigInteger(b));
case 4:
case 6:
default:
return NumberBaseOpt.castObjectToDouble(a) %
NumberBaseOpt.castObjectToDouble(b);
}
}
return a;
}
public static Object maxObject(Collection © 2015 - 2025 Weber Informatics LLC | Privacy Policy