ArrayList到数组的转换

import java.util.ArrayList; 

import java.util.Arrays;
/**
 * n o w  j a v a  . c o m 提 供 
**/


public class Main {

  public static void main(String[] args){

    ArrayList<String> al = new ArrayList<String>();

    al.add("cat");

    al.add("dog");

    al.add("rat");


    // Print the content of arrayList

    System.out.println("ArrayList:" + al);

    

    // Create an array of the same length as the ArrayList

    String[] s1 = new String[al.size()];

    

    // Copy the ArrayList elements to the array

    String[] s2 = al.toArray(s1);//来自 NowJava.com - 时代Java

    

    System.out.println("s1 == s2:" + (s1 == s2));

    System.out.println("s1:" + Arrays.toString(s1));

    System.out.println("s2:" + Arrays.toString(s2));



    // Create an array of string with 1 element.

    s1 = new String[1];

    s1[0] = "hello" ; // Store hello in first element


    // Copy ArrayList to the array s1