The Vector class is a growable array of objects. The elements of Vector can be accessed using an integer index and the size of a Vector can be increased or decreased.
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The setElementAt method of the Vector class can be used to replace the element present at the specific index of the vector object.
public void setElementAt(E obj,int index)
This method takes two arguments.
The element to be replaced in the vector object.
The index at which the new element is to be replaced. The index should be positive and less than the size of the vector object. Otherwise, ArrayIndexOutOfBoundsException will be thrown.
index >= 0 && index < size()
This method doesn’t return any value.
import java.util.Vector;class SetElementAt {public static void main( String args[] ) {// Creating VectorVector<Integer> vector = new Vector<>();// add elememtsvector.add(10);vector.add(40);vector.add(30);System.out.println("The Vector is: " + vector); // [10,40,30]vector.setElementAt(20, 1); // [10,20,30]System.out.println("\nAfter calling setElementAt(20,1). The Vector is: " + vector);}}
In the code above:
In line 5: We created a vector object.
In lines 8 to 10: We added three elements, 10,40,30, to the created vector object.
In line 14: We used the setElementAt method of the vector object to replace the element present at index 1 with the value 20. Now, the vector will be 10,20,30.