Java Vector insertElementAt() Method

The insertElementAt() method of Java Vector class is used to insert the specified object as a component in this vector at the specified index. Each component in the vector with an index greater or equal to the given index is shifted upward. Now, the vector index is one greater than the value it had previously.

Syntax

Following is the declaration of insertElementAt() method:

Parameter

Parameter	Description	Required/Optional
obj	It is the element which will be inserted.	Required
index	It is the index where we will insert the new element.	Required

Return

The insertElementAt() method does not return anything. It only inserts an element at the given index.

Exceptions

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

Compatibility Version

Java 1.2 and above

Example 1

import java.util.*;
public class VectorInsertElementAtExample1 {  
	public static void main(String arg[]) {	
	    //Create an empty vector
	    Vector<Integer> vec = new Vector<>();
	    //Add element in the vector
	    vec.add(10);
	    vec.add(20);
	    vec.add(30);	    
	    vec.add(40);
	    vec.add(50);
	    //Printing the element
	    System.out.println("Element in vector before insertion = "+vec);
	    //Insert the element at 2nd position
	    vec.insertElementAt(700, 2);
	    System.out.println("Element in vector after insertion = "+vec); 	    
	    }            
}

Test it Now

Output:

Element in vector before insertion = [10, 20, 30, 40, 50]
Element in vector after insertion = [10, 20, 700, 30, 40, 50]

Example 2

import java.util.*;
public class VectorInsertElementAtExample2 {  
	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("Ruby");
	    vec.add("Android");
	    vec.add("Python");
          //Print the elements of this vector
	    System.out.println("Components of vector: ");
          for (String program : vec) {         
              System.out.println(" " +program);
          }          
	    //Insert the element at 2nd position
          vec.insertElementAt("PHP", 1);
	    System.out.println("Components of vector after insertion = "); 
	    for (String program : vec) {         
            System.out.println(" " +program);
          } 
	}            
}

Test it Now

Output:

Components of vector: 
 Java
 Ruby
 Android
 Python
Components of vector after insertion = 
 Java
 PHP
 Ruby
 Android
 Python

Example 3

import java.util.*;
public class VectorInsertElementAtExample3 {  
	public static void main(String arg[]) {	
	    //Create an empty vector
	    Vector < String > colors = new Vector < String > ();
	    //Add elements in the vector
          colors.add("White");
          colors.add("Green");
          colors.add("Black");
          //Print the elements of this vector
          System.out.println("Color elements in vector: " +colors);
	    //Insert the element at 2nd position
	    colors.insertElementAt("Red", 12);
	    System.out.println("Element in vector after insertion = "+colors); 	    
	    }            
}

Test it Now

Output:

Color elements in vector: [White, Green, Black]
Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 12 > 3
	at java.base/java.util.Vector.insertElementAt(Vector.java:619)
	at myPackage.VectorInsertElementAtExample3.main(VectorInsertElementAtExample3.java:14)

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