How to Get Synchronized List from Java ArrayList

The example aims to get a synchronized list from ArrayList by synchronizedList method in Java.

Source Code

package com.beginner.examples;

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

public class GetSynchronizedListFromArrayList {

	public static void main(String[] args) {
		//create ArrayList.
		ArrayList arrayList = new ArrayList();
		
		/*
		  Java ArrayList is NOT synchronized. To get synchronized Map from
		  TreeMap useing the method synchronizedList() of Collections.
		 */
		List list = Collections.synchronizedList(arrayList);
		
		list.add("Hello");
		list.add("World");
		
		//Use Iterator to output
		Iterator iterator = list.iterator();
		while (iterator.hasNext()) {
		    System.out.print(iterator.next().toString());
		}

	}

}

Output:

HelloWorld

References

Imported packages in Java documentation:

• List
• ArrayList
• Collections
• Collection
• Iterator