Remove duplicate Strings from the given array. - Java java.lang

Java examples for java.lang:String Array

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Description

Remove duplicate Strings from the given array.

Demo Code


//package com.java2s;

import java.util.Collection;
import java.util.Collections;
import java.util.Enumeration;

import java.util.List;

import java.util.Set;

import java.util.TreeSet;

public class Main {
    public static void main(String[] argv) throws Exception {
        String[] array = new String[] { "1", "abc", "level", null,
                "java2s.com", "asdf 123" };
        System.out.println(java.util.Arrays
                .toString(removeDuplicateStrings(array)));
    }/*  www.  j  a va 2 s.  c  o  m*/

    /**
     * Remove duplicate Strings from the given array. Also sorts the array, as it uses a TreeSet.
     *
     * @param array
     *            the String array
     * @return an array without duplicates, in natural sort order
     */
    public static String[] removeDuplicateStrings(final String[] array) {

        // if (ObjectUtils.isEmpty(array)) {
        if (array.length == 0)
            return array;
        final Set<String> set = new TreeSet<String>();
        for (final String element : array) {
            set.add(element);
        }
        return toStringArray(set);
    }

    /**
     * Copy the given Collection into a String array. The Collection must contain String elements only.
     *
     * @param collection
     *            the Collection to copy
     * @return the String array (<code>null</code> if the passed-in Collection was <code>null</code>)
     */
    public static String[] toStringArray(final Collection<String> collection) {

        if (collection == null)
            return null;
        return collection.toArray(new String[collection.size()]);
    }

    /**
     * Copy the given Enumeration into a String array. The Enumeration must contain String elements only.
     *
     * @param enumeration
     *            the Enumeration to copy
     * @return the String array (<code>null</code> if the passed-in Enumeration was <code>null</code>)
     */
    public static String[] toStringArray(
            final Enumeration<String> enumeration) {

        if (enumeration == null)
            return null;
        final List<String> list = Collections.list(enumeration);
        return list.toArray(new String[list.size()]);
    }
}

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