Java List Merge mergeList(List list)

Here you can find the source of mergeList(List list)

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    Description

    merge List

    License

    Open Source License

    Declaration 

    public static Object mergeList(List<Object> list)

    Method Source Code

    //package com.java2s;
//License from project: Open Source License 

import java.util.List;

public class Main {
    public static Object mergeList(List<Object> list) {
        Object ret = null;/*from  w ww .j  av  a 2 s .  c  o m*/

        for (Object value : list) {
            ret = add(ret, value);
        }

        return ret;
    }

    public static Object add(Object oldValue, Object newValue) {
        if (oldValue == null) {
            return newValue;
        }

        if (oldValue instanceof Long) {
            if (newValue == null) {
                return (Long) oldValue;
            } else {
                return (Long) oldValue + (Long) newValue;
            }
        } else if (oldValue instanceof Double) {
            if (newValue == null) {
                return (Double) oldValue;
            } else {
                return (Double) oldValue + (Double) newValue;
            }
        } else {
            return null;
        }
    }
}

    Related

    1. mergeIdAndStrings(Long accountId, Long workspaceId, List strs)
    2. mergeIntegerResult(List result)
    3. mergeList(List sourceList, List resultList, Set filterSet)
    4. mergeList(List list1, List list2, List... rest)
    5. mergeList(List list1, List list2)
    6. mergeList(List list)
    7. mergeList(List list1, List list2)
    8. mergeList(List list, List... others)
    9. mergeListNoDuplicate(List one, List two)

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