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 Vectorimport 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);        }    }} |
Output
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
