Java Collections fill() Method with Examples

by Online Tutorials Library July 22, 2022

Java Collections fill() Method

The fill() method of Java Collections class is used to replace all of the elements of the specified list with the specified elements. This method filled all the elements with the same values.

Syntax

Following is the declaration of fill() method:

Parameter

Parameter	Description	Required/Optional
list	It is the list to be filled with the specified elements.	Required
obj	It is the element to fill the specified list.	Required

Returns

The fill() method does not return anything.

Exceptions

UnsupportedOperationException– This exception will be thrown if the specified list or its list-iterator does not support the set operation.

Compatibility Version

Java 1.4 and above

Example 1

  import java.util.*;  public class CollectionsFillExample1 {  public static void main(String[] args) {      //Create a list object             List arrlist = new ArrayList();      //Add elements in the list      arrlist.add(“AAA”);      arrlist.add(“BBB”);      arrlist.add(“CCC”);      System.out.println(“List elements before Replacements: “+arrlist);      //Fill the list with ‘TutorAspire’      Collections.fill(arrlist,”TutorAspire”);      System.out.println(“List elements after Replacements: “+arrlist);      }    }  

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Output:

List elements before Replacements: [AAA, BBB, CCC]  List elements after Replacements: [TutorAspire, TutorAspire , TutorAspire ]

Example 2

  import java.util.*;  public class CollectionsFillExample2 {  public static void main(String[] args) {  //Create a list object                   List arrList = Arrays.asList(1,2,3,4);           //Fill the list with 551  Collections.fill(arrList,551);        //Print the List        for(Integer i :arrList) {        System.out.print(i +” “);                    }        }    }  

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Output:

551 551 551 551

Example 3

  import java.util.*;  public class CollectionsFillExample3 {  public static void main(String[] args) {  List list = new ArrayList<>();        for (int i = 0; i < 6; i++)        list.add(“Hi”);            System.out.println(“Before Fill: “+list);        Collections.fill(list, “Hello”);        System.out.println(“After Fill: “+list);        }    }  

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Output:

Before Fill: [Hi, Hi, Hi, Hi, Hi, Hi]  After Fill: [Hello, Hello, Hello, Hello, Hello, Hello]

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Java Collections fill() Method with Examples

Java Collections fill() Method

Syntax

Parameter

Returns

Exceptions

Compatibility Version

Example 1

Example 2

Example 3

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