Ways to Loop / Iterate A List In Java

Here are four ways to loop a List in Java.

1.    Iterator loop

2.    For loop

3.    For loop (Advance)

4.    While loop

import java.util.Arrays;

import java.util.Iterator;

import java.util.List;

public class ArrayToList {

     public static void main(String[] argv) {

        String sArray[] = new String[] { "Array 1", "Array 2", "Array 3" };

        // convert array to list

        List<String> lList = Arrays.asList(sArray);

        // iterator loop

        System.out.println("#1 iterator");

        Iterator<String> iterator = lList.iterator();

        while (iterator.hasNext()) {

               System.out.println(iterator.next());

        }

        // for loop

        System.out.println("#2 for");

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

               System.out.println(lList.get(i));

        }

        // for loop advance

        System.out.println("#3 for advance");

        for (String temp : lList) {

               System.out.println(temp);

        }

        // while loop

        System.out.println("#4 while");

        int j = 0;

        while (j < lList.size()) {

               System.out.println(lList.get(j));

               j++;

        }

    }

}

Output

#1 iterator

Array 1

Array 2

Array 3

#2 for

Array 1

Array 2

Array 3

#3 for advance

Array 1

Array 2

Array 3

#4 while

Array 1

Array 2

Array 3