Intermediate Java(12) – addAll

import java.util.*;

public class apples{

public static void main(String[] args){

//create an array and convert to list

String[] stuff = {"bird","mouse","fish","dog"};

List<String> list1 = Arrays.asList(stuff);

ArrayList<String> list2 = new ArrayList<String>();

list2.add("youtube");

list2.add("google");

list2.add("digg");

for(String x:list2)

System.out.printf("%s ",x);

Collections.addAll(list2, stuff); → 將stuff所有的內容加到list2

System.out.println();

for(String x:list2)

System.out.printf("%s ",x);

}

}

這是運行時的結果: 

youtube google digg

youtube google digg bird mouse fish dog