Java Vector replaceAll() Method with Examples

by Online Tutorials Library July 22, 2022

Java Vector replaceAll() Method

The replaceAll() method of Java Vector class is used to replace each element of the list with the result of applying the operator to that element.

Syntax

Following is the declaration of replaceAll() method:

Parameter

Parameter	Description	Required/Optional
operator	It is an operator which will apply to each element.	Required

Return

The replaceAll() method does not return anything.

Exceptions

NullPointerException– This method has thrown an exception if the specified operator is null or if the operator result is a null value and this list does not permit null elements.

Compatibility Version

Java 1.2 and above

Example 1

  import java.util.*;  public class VectorReplaceAllExample1 {    public static void main(String arg[]) {  //Create an empty vector              Vector<Integer> vec = new Vector<>();              //Add elements in the Vector              vec.add(10);              vec.add(2);              vec.add(30);              vec.add(40);              vec.add(2);               //Display vector elements  System.out.println(“Vector elements: ” +vec);  //replace all vector element “2” with “20”  Collections.replaceAll(vec, 2, 20);  //Display vector elements after replacement  System.out.println(“New vector elements: ” + vec);        }  }  

Test it Now

Output:

Vector elements: [10, 2, 30, 40, 2]  New vector elements: [10, 20, 30, 40, 20]

Example 2

  import java.util.*;  public class VectorReplaceAllExample2 {    public static void main(String arg[]) {              //Create an empty vector  Vector<String> vec = new Vector<String>();              //Add elements in the Vector  vec.add(“Java”);  vec.add(“Python”);  vec.add(“Android”);  vec.add(“Java”);  vec.add(“Ruby”);              //Display vector elements  System.out.println(“Vector elements: ” +vec);              //replace all vector element “Java” with “TutorAspire”  Collections.replaceAll(vec, “Java”, “TutorAspire”);              //Display vector elements after replacement  System.out.println(“New vector elements: ” + vec);        }  }  

Test it Now

Output:

Vector elements: [Java, Python, Android, Java, Ruby]  New vector elements: [TutorAspire, Python, Android, TutorAspire , Ruby]

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