Java Collections replaceAll() Method

Last Updated : 17 Mar 2025

The replaceAll() method of Java Collections class is used to replace all occurrences of one specified value in a list with the other specified value.

Syntax

Following is the declaration of replaceAll() method:

Parameter

Parameter	Description	Required/Optional
list	It is the list in which replacement is to be occur.	Required
oldVal	It is the old value which will be replaced.	Required
newVal	It is the new value with which oldVal is to be replaced.	Required

Returns

The replaceAll() method returns true if the list contained one or more elements e such that (oldVal==null ? e==null : oldVal.equals(e)).

Exceptions

UnsupportedOperationException- It throws this exception 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 CollectionsReplaceAllExample1 {
	public static void main(String[] args) {		
		//Create vector and add element in this vector
	      Vector<String> vector = new Vector<String>();
	      vector.add("Java");
	      vector.add("SSSIT");
	      vector.add("HINDI100");
	      vector.add("Java");
	      System.out.println("Initial values are :"+vector);
	      //Replace 'Java' with 'TpointTech'
	      Collections.replaceAll(vector, "Java", "TpointTech");
	      System.out.println("Value after replace :"+ vector);
	      }
}

Output:

Initial values are :[Java, SSSIT, HINDI100, Java]
Value after replace :[TpointTech, SSSIT, HINDI100, TpointTech]

Example 2

import java.util.*;
public class CollectionsReplaceAllExample2 {
	public static void main(String[] args) {		
		//Create an list of String
		List<String> list = Arrays.asList("one", "two", "one");
            System.out.println("Original List:- "+list);
            boolean b = Collections.replaceAll(list, "one", "three");
            System.out.println("Boolean: "+b);
            System.out.println("Value after replace:- "+list);
	      }
}

Output:

Original List:- [one, two, one]
Boolean: true
Value after replace:- [three, two, three]

Example 3

import java.util.*;
public class CollectionsReplaceAllExample3 {
	public static void main(String[] args) {		       
            //Create an list of integers
		List<String> list = Arrays.asList("10", "20", "10", "40", "50", "10"); 
            System.out.println("Original List: " +list);       
            boolean b = Collections.replaceAll(list, "10", "400"); 
            System.out.println("Boolean: "+b);
            System.out.println("Value after Replace: " +list);
	      }
}

Output:

Original List: [10, 20, 10, 40, 50, 10]
Boolean: true
Value after Replace: [400, 20, 400, 40, 50, 400]

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Java Collections replaceAll() Method

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Example 1

Example 2

Example 3

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Java Collections replaceAll() Method

Syntax

Parameter

Returns

Exceptions

Compatibility Version

Example 1

Example 2

Example 3

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