Java List Merge mergeList(List list)

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    Description

    merge List

    License

    Apache License

    Declaration 

    public static Object mergeList(List<Object> list)

    Method Source Code

    //package com.java2s;
/**// w w w .jav a2s  .c  o m
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import java.util.Collection;

import java.util.List;

import java.util.Set;

public class Main {
    public static Object mergeList(List<Object> list) {
        Object ret = null;

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

        return ret;
    }

    @SuppressWarnings("rawtypes")
    public static List<Object> mergeList(List<Object> result, Object add) {
        if (add instanceof Collection) {
            for (Object o : (Collection) add) {
                result.add(o);
            }
        } else if (add instanceof Set) {
            for (Object o : (Collection) add) {
                result.add(o);
            }
        } else {
            result.add(add);
        }

        return result;
    }

    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.valueOf(String.valueOf(newValue));
            }
        } else if (oldValue instanceof Integer) {
            if (newValue == null) {
                return (Integer) oldValue;
            } else {
                return (Integer) oldValue + Integer.valueOf(String.valueOf(newValue));
            }
        } else if (oldValue instanceof Double) {
            if (newValue == null) {
                return (Double) oldValue;
            } else {
                return (Double) oldValue + Double.valueOf(String.valueOf(newValue));
            }
        } else if (oldValue instanceof Float) {
            if (newValue == null) {
                return (Float) oldValue;
            } else {
                return (Float) oldValue + Float.valueOf(String.valueOf(newValue));
            }
        } else {
            return null;
        }
    }
}

    Related

    1. mergeIntegerResult(List result)
    2. mergeList(List sourceList, List resultList, Set filterSet)
    3. mergeList(List list1, List list2, List... rest)
    4. mergeList(List list1, List list2)
    5. mergeList(List list)
    6. mergeList(List list1, List list2)
    7. mergeList(List list, List... others)
    8. mergeListNoDuplicate(List one, List two)
    9. mergeLists(final T... array)

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