How to loop ArrayList in Java

By mkyong | Updated: August 29, 2012

Viewed: 287 (+2 pv/w)

Tags: arraylist java loop

No nonsense, four ways to loop ArrayList in Java

1. For loop
2. For loop (Advance)
3. While loop
4. Iterator loop

package com.mkyong.core;

import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;

public class ArrayListLoopingExample {
	public static void main(String[] args) {

		List<String> list = new ArrayList<String>();
		list.add("Text 1");
		list.add("Text 2");
		list.add("Text 3");

		System.out.println("#1 normal for loop");
		for (int i = 0; i < list.size(); i++) {
			System.out.println(list.get(i));
		}

		System.out.println("#2 advance for loop");
		for (String temp : list) {
			System.out.println(temp);
		}

		System.out.println("#3 while loop");
		int j = 0;
		while (list.size() > j) {
			System.out.println(list.get(j));
			j++;
		}

		System.out.println("#4 iterator");
		Iterator<String> iterator = list.iterator();
		while (iterator.hasNext()) {
			System.out.println(iterator.next());
		}
	}
}

Output

#1 normal for loop
Text 1
Text 2
Text 3
#2 advance for loop
Text 1
Text 2
Text 3
#3 while loop
Text 1
Text 2
Text 3
#4 iterator
Text 1
Text 2
Text 3