此方法向字符串[]添加一个字符串，排除所有重复项。

/*from n o w  j a v a  . c o m*/

//package com.nowjava;


public class Main {

    public static void main(String[] argv) throws Exception {

        String s1 = "nowjava.com";

        String[] arr = new String[] { "1", "abc", "level", null,

                "nowjava.com", "asdf 123" };

        System.out.println(java.util.Arrays.toString(addToArray(s1, arr)));

    }


    /**

     * This method adds a String to a String[] excluding all duplicates.

     * @param s1

     * @param arr

     * @return String[]

     */

    private static String[] addToArray(String s1, String[] arr) {

        //Checks for duplicates ignoring case// 来自 时代Java

        if (duplicateInsertion(s1, arr) == true)

            return arr;


        //Increase array size by 1

        String[] tempList = arr.clone();

        arr = new String[arr.length + 1];


        //Add in original elements

        if (!(tempList.length < 1)) {

            for (int i = 0; i < tempList.length; i++)

                arr[i] = tempList[i];

        }


        //Add new String to Array

        arr[tempList.length] = s1;


        return arr;

    }


    /**

     * Uses binary searching to check if a String is already in a String[].

     * Upper and lower case words that are the same are considered duplicates.

     * ie Hat and hat are duplicates.

     * @param s1

     * @param arr

     * @return

     */