To replace an element in Java Vector, set() method of java.util.Vector class can be used. The set() method takes two parameters-the indexes of the element which has to be replaced and the new element. The index of a Vector is zero-based. So, to replace the first element, 0 should be the index passed as parameter.
Declaration:
public Object set(int index, Object element)
Return Value:Â
The element which is at the specified index
Exception Throws:
IndexOutOfBoundsException when the index is out of range i.e, index < 0 or index >= size()
Implementation:
Java
// Replacing Element in Java Vector import java.util.Vector; public class Sias {     public static void main(String args[])     {         try {               // create a instance vector             Vector<Integer> vector = new Vector<>();               // insert the values in vector             vector.add( 1 );             vector.add( 2 );             vector.add( 3 );             vector.add( 4 );             vector.add( 5 );               // display the vector             System.out.println( "original vector : "                                + vector);               // call set() and replace 2 index value             vector.set( 2 , 10 );               // display vector after replacing value             System.out.println( "after replace the value : "                                + vector);             // call set() and replace 9th index value             // which is exception as arrayoutofbound             vector.set( 9 , 91 );               // display vector after replacing value             System.out.println( "after replace the value : "                                + vector);         }         catch (Exception e) {             System.out.println(e);         }     } } |
original vector : [1, 2, 3, 4, 5] after replace the value : [1, 2, 10, 4, 5] java.lang.ArrayIndexOutOfBoundsException: Array index out of range: 9
Time Complexity: O(n), where n is the length of the vector