用亲爱的java重新实现js中巨好用的reduce

package js_method;

import java.util.List;


public interface CallBack {
    T_INIT callBack(T_INIT initValue,T_ARRAY element,int index, List arr);
}

package js_method;

import java.util.List;

public abstract class Reduce implements CallBack{
    @Override
    public abstract INITVALUE_TYPE callBack(INITVALUE_TYPE initValue, ARRAY_TYPE element, int index, List arr);
    public INITVALUE_TYPE reduce(List array,CallBack callBack,INITVALUE_TYPE initvalue) throws Exception {
        if(array==null) throw new Exception("must have array!!!");
        if(callBack==null) throw new Exception("must have callback function!!!");
        int i=0;
        if(initvalue == null){
            while(i 
package js_method;

import java.util.Arrays;
import java.util.List;

public class UseReduce {
    public static void main(String[] args) throws Exception {
        Reduce reduce = new Reduce() {
            @Override
            public Integer callBack(Integer initValue, Integer element, int index, List arr) {
                return initValue+element;
            }
        };
        Integer reduceRes = reduce.reduce(Arrays.asList(1, 2, 3, 4, 5), reduce, null);
        System.out.println(reduceRes);

    }

}