Java ArrayList到数组的转换

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import java.util.ArrayList; 

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import java.util.Arrays;

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 * n o w  j a v a  . c o m 提 供 

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public class Main {

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  public static void main(String[] args){

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

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    al.add("cat");

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    al.add("dog");

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    al.add("rat");

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    // Print the content of arrayList

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

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

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

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    // Copy the ArrayList elements to the array

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

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

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

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

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    // Create an array of string with 1 element.

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    s1 = new String[1];

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

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    // Copy ArrayList to the array s1

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    s2 = al.toArray(s1);

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