Java Vector setSize() Method

The setSize() method of Java Vector class is used to set the size of a vector. If the new size is greater than the current size, null items are added to the end of the vector. Otherwise, all components at index newSize and greater are discarded.

Syntax

Following is the declaration of setSize() method:

Parameter

Parameter	Description	Required/Optional
newSize	It is the new size of the vector.	Required

Return

The setSize() method does not return anything. It only set the new size of the vector.

Exceptions

ArrayIndexOutOfBoundsException- This method has thrown an exception if the new size of the vector is negative i.e. newSize < 0.

Compatibility Version

Java 1.2 and above

Example 1

import java.util.*;
public class VectorSetSizeExample1 {  
	public static void main(String arg[]) {	
	    //Create an empty vector 
	    Vector<Integer> vec = new Vector<>();
	    //Add elements in the vector
	    vec.add(1);
	    vec.add(2);
	    vec.add(3);
	    System.out.println("Components of the vector: "+vec);      
          //Set the new size of the vector
          vec.setSize(6);
          //Displaying the vector elements after setting new size
          System.out.println("Components of the vector after setting new size: ");          
          for (Integer num : vec) {         
             System.out.println("Number = " +num);
	    }            
      }
}

Test it Now

Output:

Components of the vector: [1, 2, 3]
Components of the vector after setting new size: 
Number = 1
Number = 2
Number = 3
Number = null
Number = null
Number = null

Example 2

import java.util.*;
public class VectorSetSizeExample2 {  
	public static void main(String arg[]) {	
	    //Create an empty vector
	    Vector < String > colors = new Vector < String > ();
	    //Add elements in the vector
          colors.add("White");
          colors.add("Green");
          colors.add("Black");
          //Displaying the vector elements
          System.out.println("Components of a vector: "+colors);
          //Set the new size for the vector
          colors.setSize(6);
          //Displaying the vector elements after setting new size
          System.out.print("Components of a vector after setting new size: "+colors);    
	    }            
}

Test it Now

Output:

Components of a vector: [White, Green, Black]
Components of a vector after setting new size: [White, Green, Black, null, null, null]

Example 3

import java.util.*;
public class VectorSetSizeExample3 {  
	public static void main(String arg[]) {	
	    //Create an empty vector 
	    Vector<Integer> vec = new Vector<>();
	    //Add elements in the vector
	    vec.add(10);
	    vec.add(20);
	    vec.add(30);	    
	    //Set the new size of the vector
	    vec.setSize(-15);
	    //Displaying the vector element
	    System.out.println("Vector element after setSize(): " +vec);
	    }            
}

Test it Now

Output:

Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: -15
	at java.base/java.util.Vector.setSize(Vector.java:314)
	at myPackage.VectorSetSizeExample3.main(VectorSetSizeExample3.java:12)

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