从Arraylist一个接一个地打印出不同的项目

Question

I will try to explain my problem. I have an Arraylist with several strings. I have an output method:

    ArrayList<String> testList = new ArrayList<String>();
    testList.add("test1");
    testList.add("test2");
    testList.add("test3");
    testList.add("test4");
    public static void output(int testIndex) {

        for (int i = 0; i < testList.size(); i++) {
        }
 System.out.println("Domain: "+ testList.get(testIndex));


    }

So depending on what data I need, I can use my output method and enter my values. If I enter 0 as testIndex, it will print out "test1".

I want to make this a little better though. What I want to do is whenever I call my output method, I want it to print out the first item. When I call it again the second time, I want it to print out the second item. When I call it a third time, I want to print out the third item.. and so on.

How do I do this? Can Java do this? I also don't want to remove anything from my Arraylist.

Answer 1

You could save the current position in a data member:

private static testIndex = 0;
public static void output() {
    System.out.println("Domain: "+ chunkList.get(testIndex));
    ++testIndex;
}

Answer 2

What you need is to have a int value that is the counter that will increment each time you call the output method such as:

int counter = 0;

and if you call your output method you then post increment it:

output(counter++);

Make sure you check if the counter is equal or greater than the size of your arraylist.

Answer 3

Use queue instead of arraylist.
Syntax is :

Queue queue = new LinkedList(); 
queue.element()

To get the output without deleting it from the list