Java Utility Library

Java Collections - fill() Method

The java.util.Collections.fill() method is used to replace all of the elements of the specified list with the specified element.

Syntax

public static <T> void fill(List<? super T> list, 
                            T obj)

Here, T is the type of element in the list.

Parameters

`list`	Specify the list to be filled with the specified element.
`obj`	Specify the element with which to fill the specified list.

Return Value

void type.

Exception

Throws UnsupportedOperationException, if the specified list or its list-iterator does not support the set operation.

Example:

In the example below, the java.util.Collections.fill() method is used to fill the given list with specified element.

import java.util.*;

public class MyClass {
  public static void main(String[] args) {
    //creating a list object
    List<Integer> MyList = new ArrayList<Integer>();

    //populating MyList
    MyList.add(10);
    MyList.add(20);
    MyList.add(30);

    //printing the list
    System.out.println("MyList contains: " + MyList); 

    //fill the list with 25
    Collections.fill(MyList, 25);

    //printing the list
    System.out.println("MyList contains: " + MyList); 
  }
}

The output of the above code will be:

MyList contains: [10, 20, 30]
MyList contains: [25, 25, 25]

❮ Java.util - Collections