Java數組，去掉重複值、增長、刪除數組元素

import java.util.List;
import java.util.ArrayList;
import java.util.Set;
import java.util.HashSet;
public class lzwCode {

    public static void main(String [] args) {
        testA();
        System.out.println("===========================");
        testB();
        System.out.println("===========================");
        testC();
    }

    //去掉數組中重複的值
    public static void testA() {
        String [] str = {"Java", "C++", "Php", "C#", "Python", "C++", "Java"};
        for (String elementA:str ) {
            System.out.print(elementA + " ");
        }
        List<String> list = new ArrayList<String>();
        for (int i=0; i<str.length; i++) {
            if(!list.contains(str[i])) {
                list.add(str[i]);
            }
        }
        /*
        Set<String> set = new HashSet<String>();
        for (int i=0; i<str.length; i++) {
            set.add(str[i]);
        }
        String[] newStr =  set.toArray(new String[1]); 
        */
        System.out.println();
        String[] newStr =  list.toArray(new String[1]); //返回一個包含全部對象的指定類型的數組 
        for (String elementB:newStr ) {
            System.out.print(elementB + " ");
        }
        System.out.println();
    }

    //刪除數組中其中一個元素
    public static void testB() {
        String [] str = {"Java", "C++", "Php", "C#", "Python"};
        for (String elementA:str ) {
            System.out.print(elementA + " ");
        }
        //刪除php
        List<String> list = new ArrayList<String>();
        for (int i=0; i<str.length; i++) {
            list.add(str[i]);
        }
        list.remove(2); //list.remove("Php") 
        System.out.println();
        String[] newStr =  list.toArray(new String[1]); //返回一個包含全部對象的指定類型的數組 
        for (String elementB:newStr ) {
            System.out.print(elementB + " ");
        }    
        System.out.println();
    }

    //在數組中增長一個元素
    public static void testC() {
        String [] str = {"Java", "C++", "Php", "C#", "Python"};
        for (String elementA:str ) {
            System.out.print(elementA + " ");
        }
        //增長ruby
        List<String> list = new ArrayList<String>();
        for (int i=0; i<str.length; i++) {
            list.add(str[i]);
        }
        list.add(2, "ruby"); //list.add("ruby") 
        System.out.println();
        String[] newStr =  list.toArray(new String[1]); //返回一個包含全部對象的指定類型的數組 
        for (String elementB:newStr ) {
            System.out.print(elementB + " ");
        }    
        System.out.println();
    }
}

ps:http://blog.csdn.net/lzwjavaphp/article/details/6998453