Intermediate Java(4) - Introduction to Collections

import java.util.*;

public class apples{

public static void main(String[] args){

String[] things={"eggs","laser","hats","pie"};

List<String> list1 = new ArrayList<String>();

//添加array在List

for(String x:things)

list1.add(x);

String[] morethings = {"lasers","hats"};

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

//添加array在List

for (String y:morethings)

list2.add(y);

for(int i=0;i<list1.size();i++){

System.out.printf("%s ", list1.get(i));

}

System.out.println();

for(int i=0;i<list2.size();i++){

System.out.printf("%s ", list2.get(i));

}

}

}

i<list1.size() → 這個list中有多少array item

list1.get(i) → 獲取這個list中array item

這是運行時的結果:

eggs laser hats pie

lasers hats