To create a Java List containing n Copies of a specified Object, nCopies() method of java.util.Collections class can be used. The nCopies() method takes two parameters – n the length of the list and the object which has to be copied n times in the list.
Example:
Input : n = 4, Object = "Hello" Output: listOfObjects = ["Hello", "Hello", "Hello", "Hello"] Input : n = 3, Object = 3 Output: listOfObjects = [3, 3, 3]
Declaration:
public static nCopies(int length, Object object)
Return Value: An immutable List containing n copies of the specified object.
Exception Throws: IllegalArgumentException
if the length provided is less than 0
i.e, n < 0
Java
// Create List containing n Copies// of Specified Object in javaimport java.io.*;import java.util.Collections;import java.util.List; class GFG { public static void main(String[] args) { int n = 5; Object myObj = "GFG"; List myList = Collections.nCopies(n, myObj); System.out.println(myList); }} |
Output
[GFG, GFG, GFG, GFG, GFG]