Vector setSize() method in Java with Example

The Java.util.Vector.setSize() is a method of Vector class which is used to set the new size of vector. If new size of vector is greater than the current size then null elements are added to the vector is new size is less than current size then all higher order elements are deleted. If new size size is negative then there will be Runtime Error : ArrayIndexOutOfBoundsException

Syntax:

public void setSize(int newSize)

Parameters:This method accepts a mandatory parameter newSize of vector.

Return Type: This method modified the size of the Vector to the newSize and does not return anything.

Exceptions: This method throws ArrayIndexOutOfBoundsException if new size is negative.

Below examples illustrates the working of Vector.setSize() method:

Example 1:

// Java program to understand 
// about vector.setSize() method 
  
import java.util.*; 
  
public class GFG { 
    public static void main(String[] args) 
    { 
  
        // creating vector type object 
        Vector<String> v = new Vector<String>(); 
  
        // inserting elements into the vector 
        v.add("Geeks"); 
        v.add("for"); 
        v.add("Geeks"); 
        v.add("Ankit"); 
        v.add("MNNIT"); 
        v.add("Allahabad"); 
  
        // printing vector before calling setSize() 
        System.out.println("Initially"); 
        System.out.println("Vector: " + v); 
        System.out.println("Size: " + v.size()); 
  
        // setting new size 
        v.setSize(8); 
  
        // printing vector after calling setSize() 
        System.out.println("\nAfter using setSize()"); 
        System.out.println("Vector: " + v); 
        System.out.println("Size: " + v.size()); 
    } 
} 

Output:

Initially
Vector: [Geeks, for, Geeks, Ankit, MNNIT, Allahabad]
Size: 6

After using setSize()
Vector: [Geeks, for, Geeks, Ankit, MNNIT, Allahabad, null, null]
Size: 8

Example 2:

// Java program to understand 
// about vector.setSize() method 
  
import java.util.*; 
  
public class GFG { 
    public static void main(String[] args) 
    { 
  
        // creating vector type object 
        Vector<String> v = new Vector<String>(); 
  
        // inserting elements into the vector 
        v.add("Geeks"); 
        v.add("for"); 
        v.add("Geeks"); 
        v.add("Ankit"); 
        v.add("MNNIT"); 
        v.add("Allahabad"); 
  
        // printing vector before calling setSize() 
        System.out.println("Initially"); 
        System.out.println("Vector: " + v); 
        System.out.println("Size: " + v.size()); 
  
        // setting new size 
        v.setSize(4); 
  
        // printing vector after calling setSize() 
        System.out.println("\nAfter using setSize()"); 
        System.out.println("Vector: " + v); 
        System.out.println("Size: " + v.size()); 
    } 
} 

Output:

Initially
Vector: [Geeks, for, Geeks, Ankit, MNNIT, Allahabad]
Size: 6

After using setSize()
Vector: [Geeks, for, Geeks, Ankit]
Size: 4

When new size is negative

// Java program to understand 
// about vector.setSize() method 
  
// because vector is present in this package 
import java.util.*; 
  
// Driver Code 
public class GFG { 
    // main method begins here 
    public static void main(String[] args) 
    { 
        // creating vector type object 
        Vector<String> v = new Vector<String>(); 
        // inserting elements into the vector 
        v.add("Geeks"); 
        v.add("for"); 
        v.add("Geeks"); 
        v.add("Ankit"); 
        v.add("MNNIT"); 
        v.add("Allahabad"); 
  
        // printing vector before calling setSize() 
        System.out.println("Initially"); 
        System.out.println("Vector: " + v); 
        System.out.println("Size: " + v.size()); 
  
        try { 
            // setting new size 
            v.setSize(-8); 
        } 
        catch (Exception e) { 
            System.out.println("Trying to change "
                               + "size to '-8'\n"
                               + e); 
        } 
    } 
} 

Output:

Initially
Vector: [Geeks, for, Geeks, Ankit, MNNIT, Allahabad]
Size: 6
Trying to change size to '-8'
java.lang.ArrayIndexOutOfBoundsException: -8

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