Java Vector set() Method

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Description

The Java Vector set(int index,E element) method is used to replace the element at the specified position in this Vector with the specified element.

Declaration

Following is the declaration for java.util.Vector.set() method

public E set(int index,E element)

Parameters

• index − This is the index of the element to be replaced.

• element − This is the element to be stored at the specified position.

Return Value

The method call returns the element that was previously stored at the specified position.

Exception

ArrayIndexOutOfBoundsException − This exception is thrown if the accessed index is out of range.

Updating an Element of a Vector of Integer by Index Example

The following example shows the usage of Java Vector set(index, element) method. We're adding couple of Integers to the Vector object using add() method calls per element and using set(index, element) method, we're insert one of the element by index in between and printing it.

package com.tutorialspoint;

import java.util.Vector;

public class VectorDemo {
   public static void main(String[] args) {
      
      // create an empty vector 
      Vector<Integer> vector = new Vector<>();

      // use add() method to add elements in the vector
      vector.add(20);
      vector.add(30);
      vector.add(20);
      vector.add(30);
      vector.add(15);
      vector.add(22);
      vector.add(11);

      // insert an element at index 2
      vector.set(2, 50);

      // let us print the 3rd element
      System.out.println("3rd Element = " + vector.get(2));
   }
}

Output

Let us compile and run the above program, this will produce the following result −

3rd Element = 50

Updating an Element of a Vector of String by Index Example

The following example shows the usage of Java Vector set(index, element) method. We're adding couple of Strings to the Vector object using add() method calls per element and using set(index, element) method, we're insert one of the element by index in between and printing it.

package com.tutorialspoint;

import java.util.Vector;

public class VectorDemo {
   public static void main(String[] args) {
      
      // create an empty vector
      Vector<String> vector = new Vector<>();

      // use add() method to add elements in the vector
      vector.add("Welcome");
      vector.add("To");
      vector.add("Tutorialspoint");

      // insert an element at index 2
      vector.set(2, "World Of");
	  
      // let us print the 3rd element
      System.out.println("3rd Element = " + vector.get(2));     
   }
}

Output

Let us compile and run the above program, this will produce the following result −

3rd Element = World Of

Updating an Element of a Vector of Student by Index Example

The following example shows the usage of Java Vector set(index, element) method. We're adding couple of Student objects to the Vector object using add() method calls per element and using set(index, element) method, we're insert one of the element by index in between and printing it.

package com.tutorialspoint;

import java.util.Vector;

public class VectorDemo {
   public static void main(String[] args) {

      // create an empty vector
      Vector<Student> vector = new Vector<>();

      // use add() method to add elements in the vector
      vector.add(new Student(1, "Julie"));
      vector.add(new Student(2, "Robert"));
      vector.add(new Student(3, "Adam"));
	  
      // insert an element at index 2
      vector.set(2, new Student(4, "Jene"));

      // let us print the 3rd element
      System.out.println("3rd Element = " + vector.get(2));      
   }
}

class Student {
   int rollNo;
   String name;

   Student(int rollNo, String name){
      this.rollNo = rollNo;
      this.name = name;
   }

   @Override
   public String toString() {
      return "[ " + this.rollNo + ", " + this.name + " ]";
   }
}

Output

Let us compile and run the above program, this will produce the following result −

3rd Element = [ 4, Jene ]