remove duplicate entries in list - Android java.util

Android examples for java.util:List Element

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Description

remove duplicate entries in list

Demo Code


//package com.java2s;

import java.util.List;

public class Main {
    /**//from w  w w . ja v a  2 s .c  om
     * remove duplicate entries in list
     * 
     * @param <V>
     * @param sourceList
     * @return the count of entries be removed
     */
    public static <V> int distinctList(List<V> sourceList) {
        if (isEmpty(sourceList)) {
            return 0;
        }

        int sourceCount = sourceList.size();
        int sourceListSize = sourceList.size();
        for (int i = 0; i < sourceListSize; i++) {
            for (int j = (i + 1); j < sourceListSize; j++) {
                if (sourceList.get(i).equals(sourceList.get(j))) {
                    sourceList.remove(j);
                    sourceListSize = sourceList.size();
                    j--;
                }
            }
        }
        return sourceCount - sourceList.size();
    }

    /**
     * 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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