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Collections fill() method in Java with Examples
  • Difficulty Level : Basic
  • Last Updated : 07 Jul, 2020

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

This method runs in linear time.

Syntax:

public static  void fill(List list, T obj)

Parameters: This method takes following argument as parameter

  • list – the list to be filled with the specified element.
  • obj – The element with which to fill the specified list.

Below are the examples to illustrate the fill() method



Example 1:




// Java program to demonstrate
// fill() method
// for String value
  
import java.util.*;
  
public class GFG1 {
    public static void main(String[] argv) throws Exception
    {
        // creating object of List<Integer>
        List<String> arrlist = new ArrayList<String>();
  
        // Adding element to srclst
        arrlist.add("A");
        arrlist.add("B");
        arrlist.add("C");
  
        // print the elements
        System.out.println("List elements before fill: "
                           + arrlist);
  
        // fill the list
        Collections.fill(arrlist, "TAJMAHAL");
  
        // print the elements
        System.out.println("\nList elements after fill: "
                           + arrlist);
    }
}
Output:
List elements before fill: [A, B, C]

List elements after fill: [TAJMAHAL, TAJMAHAL, TAJMAHAL]

Example 2:




// Java program to demonstrate
// fill() method
// for Integer value
  
import java.util.*;
  
public class GFG1 {
    public static void main(String[] argv) throws Exception
    {
  
        // creating object of List<Integer>
        List<Integer> arrlist = new ArrayList<Integer>();
  
        // Adding element to srclst
        arrlist.add(20);
        arrlist.add(30);
        arrlist.add(40);
  
        // print the elements
        System.out.println("List elements before fill: "
                           + arrlist);
  
        // fill the list
        Collections.fill(arrlist, 500);
  
        // print the elements
        System.out.println("\nList elements after fill: "
                           + arrlist);
    }
}
Output:
List elements before fill: [20, 30, 40]

List elements after fill: [500, 500, 500]

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