Create a List containing n Copies of Specified Object

Create a List containing n Copies of Specified Object This java example shows how to create a list consisting n copies of specified copies using nCopies method of Collections class.

To create a List containing n copies of specified Object use static List nCopies(int n, Object obj) method of Java Collection class.This method returns immutable List containing n copies of the specified Object.

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

public class CreateListOfNCopiesExample {
 public static void main(String[] args) {
  List list = Collections.nCopies(5,"A");
  //iterate through newly created list
  System.out.println("List contains, ");
  Iterator itr = list.iterator();
  while(itr.hasNext())
  System.out.println(itr.next());
  }
    }

The Output of above program:

List contains,

    A
    A
    A
    A
    A

Reference Books:

• Core Java : Advanced Features (Volume - 2) 8 Edition
• Core JAVA : An Integrated Approach 1 Edition
• Core JavaServer Faces 3 Edition
• SCJP Sun Certified Programmer for Java 6 Study Exam 310