add all distinct entry to list1 from list2 - Android java.util

Android examples for java.util:List Element

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Description

add all distinct entry to list1 from list2

Demo Code


//package com.java2s;

import java.util.List;

public class Main {
    /**/*www  . j av  a 2 s .  c  o  m*/
     * add all distinct entry to list1 from list2
     * 
     * @param <V>
     * @param sourceList
     * @param entryList
     * @return the count of entries be added
     */
    public static <V> int addDistinctList(List<V> sourceList,
            List<V> entryList) {
        if (sourceList == null || isEmpty(entryList)) {
            return 0;
        }

        int sourceCount = sourceList.size();
        for (V entry : entryList) {
            if (!sourceList.contains(entry)) {
                sourceList.add(entry);
            }
        }
        return sourceList.size() - sourceCount;
    }

    /**
     * is null or its size is 0
     * 
     * <pre>
     * isEmpty(null)   =   true;
     * isEmpty({})     =   true;
     * isEmpty({1})    =   false;
     * </pre>
     * 
     * @param <V>
     * @param sourceList
     * @return if list is null or its size is 0, return true, else return false.
     */
    public static <V> boolean isEmpty(List<V> sourceList) {
        return (sourceList == null || sourceList.size() == 0);
    }
}

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