## What is the Vector.setElementAt method in Java? Answer

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.

Read more about `Vector`

here.

The `setElementAt`

method of the `Vector`

class can be used to replace the element present at the specific index of the vector object.

### Syntax

`public void setElementAt(E obj,int index)`

### Argument

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()`

### Return value

This method doesn’t return any value.

### Code

```
import java.util.Vector;
class SetElementAt {
public static void main( String args[] ) {
// Creating Vector
Vector<Integer> vector = new Vector<>();
// add elememts
vector.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);
}
}
```

### Explanation

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`

.

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