Vector insertElementAt() Method in Java
The java.util.vector.insertElementAt(element, index) method is used to insert a particular element at the specified index of the Vector. Both the element and the position is passed as the parameters. If an element is inserted at a specified index, then all the elements are pushed upward by one and hence the capacity is increased, creating a space for the new element.
Syntax:
Vector.insertElementAt()
Parameters: The method accepts two parameters:
- element: This is element required to be inserted into the vector.
- index: This is of integer type and refers to the position where the new element is to be inserted.
Return Value: The method does not return anything.
Exception: The method throws ArrayIndexOutOfBoundsException if the index is an invalid number.
Below programs illustrate the Java.util.Vector.insertElementAt() method:
Program 1: Adding String elements into the Vector.
// Java code to illustrate insertElementAt() import java.util.*; public class VectorDemo { public static void main(String args[]) { // Creating an empty Vector Vector<String> vec_tor = new Vector<String>(); // Use add() method to add elements into the Vector vec_tor.add( "Welcome" ); vec_tor.add( "To" ); vec_tor.add( "Geeks" ); vec_tor.add( "4" ); vec_tor.add( "Geeks" ); // Displaying the Vector System.out.println( "Vector: " + vec_tor); // Inseting element at 3rd position vec_tor.insertElementAt( "Hello" , 2 ); // Inseting element at last position vec_tor.insertElementAt( "World" , 6 ); // Displaying the final Vector System.out.println( "The final vector is " + vec_tor); } } |
Vector: [Welcome, To, Geeks, 4, Geeks] The final vector is [Welcome, To, Hello, Geeks, 4, Geeks, World]
Program 2: Adding Integer elements into the Vector.
// Java code to illustrate insertElementAt() import java.util.*; public class VectorDemo { public static void main(String args[]) { // Creating an empty Vector Vector<Integer> vec_tor = new Vector<Integer>(); // Use add() method to add elements into the Vector vec_tor.add( 10 ); vec_tor.add( 20 ); vec_tor.add( 30 ); vec_tor.add( 40 ); vec_tor.add( 50 ); // Displaying the Vector System.out.println( "Vector: " + vec_tor); // Inseting element at 1st position vec_tor.insertElementAt( 100 , 0 ); // Inseting element at fifth position vec_tor.insertElementAt( 200 , 4 ); // Displaying the final Vector System.out.println( "The final vector is " + vec_tor); } } |
Vector: [10, 20, 30, 40, 50] The final vector is [100, 10, 20, 30, 200, 40, 50]
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