Java Vector setElementAt() Method

The setElementAt() method of Java Vector class is used to replace the component at the specified index of this vector to be the specified object.

Syntax

Following is the declaration of setElementAt() method:

Parameter

Parameter	Description	Required/Optional
index	It is the specified index where an element will be replaced.	Required
obj	It is the component which will be set at the specified position.	Required

Return

This method has return type void so, it does not return anything.

Exceptions

ArrayIndexOutOfBoundsException- This method has thrown an exception if the index of an array is out of range i.e. (index < 0 || index >= size()).

Compatibility Version

Java 1.2 and above

Example 1

import java.util.*;
public class VectorSetElementAtExample1 {  
	public static void main(String arg[]) {		
	    //Create an empty vector 
	    Vector<Integer> vec = new Vector<>();
	    //Add elements in the vector
	    vec.add(1);
	    vec.add(2);
	    vec.add(3);
	    vec.add(4);
	    vec.add(6);
	    //Displaying the vector element
	    System.out.println("Vector element before setElementAt(): " +vec);
	    //Set Element 5 at 4th index position
	    vec.setElementAt(5, 4);	 	    
	    //Displaying the vector element again
	    System.out.println("Vector element after setElementAt(): "+vec);
	    }            
}

Test it Now

Output:

Vector element before setElementAt: [1, 2, 3, 4, 6]
Vector element after setElementAt: [1, 2, 3, 4, 5]

Example 2

import java.util.*;
public class VectorSetElementAtExample2 {  
	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("Android");
		vec.add("Python");
		vec.add("COBOL");
	      //Displaying the vector element
	      System.out.println("Vector element before setElementAt(): " +vec);
	      //Set "JavaTpoint" at 3rd index position
	      vec.setElementAt("JavaTpoint", 3);	 	    
	      //Displaying the vector element again
	      System.out.println("Vector element after setElementAt(): "+vec);
	      }            
}

Test it Now

Output:

Vector element before setElementAt: [Java, Android, Python, COBOL]
Vector element after setElementAt: [Java, Android, Python, JavaTpoint]

Example 3

import java.util.*;
public class VectorSetElementAtExample3 {  
	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(20);
	    vec.add(30);	    
	    //Set 500 at 15th index position
	    vec.setElementAt(15,500);
	   //Displaying the vector element
	    System.out.println("Vector element after set: " +vec);
	    }            
}

Test it Now

Output:

Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 500 >= 3
	at java.base/java.util.Vector.setElementAt(Vector.java:552)
	at myPackage.VectorSetElementAtExample3.main(VectorSetElementAtExample3.java:12)

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