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Java Vector setSize() Method

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

Following is the declaration for java.util.Vector.setSize() method

public void setSize(int newSize)

newSize − This is the new size of the vector

NA

ArrayIndexOutOfBoundsException − This exception is thrown if the new size is negative.

The following example shows the usage of Java Vector setsize(int) method. We're adding couple of Integers to the Vector object using add() method calls per element and using setSize(int) method, we're setting the new size as greater than vector current sizeand printing all the elements of vector including null values.

package com.tutorialspoint;

import java.util.Vector;

public class VectorDemo {
   public static void main(String[] args) {

      // create an empty Vector vec with an initial capacity of 4      
      Vector<Integer> vec = new Vector<>(4);

      // use add() method to add elements in the vector
      vec.add(4);
      vec.add(3);
      vec.add(2);
      vec.add(1);

      // set new size to 8
      vec.setSize(8);

      // let us print all the elements available in vector
      System.out.println("Added numbers are :- "); 
      
      for (Integer number : vec) {         
         System.out.println("Number = " + number);
      }
   }
} 

Let us compile and run the above program, this will produce the following result.

Added numbers are :- 
Number = 4
Number = 3
Number = 2
Number = 1
Number = null
Number = null
Number = null
Number = null

The following example shows the usage of Java Vector setsize(int) method. We're adding couple of Integers to the Vector object using add() method calls per element and using setSize(int) method, we're setting the new size as less than vector current size and printing all the elements of vector.

package com.tutorialspoint;

import java.util.Vector;

public class VectorDemo {
   public static void main(String[] args) {

      // create an empty Vector vec with an initial capacity of 4      
      Vector<Integer> vec = new Vector<>(4);

      // use add() method to add elements in the vector
      vec.add(4);
      vec.add(3);
      vec.add(2);
      vec.add(1);

      // set new size to 2
      vec.setSize(2);

      // let us print all the elements available in vector
      System.out.println("Added numbers are :- "); 
      
      for (Integer number : vec) {         
         System.out.println("Number = " + number);
      }
   } 
} 

Let us compile and run the above program, this will produce the following result.

Added numbers are :- 
Number = 4
Number = 3

The following example shows the usage of Java Vector setsize(int) method. We're adding couple of Integers to the Vector object using add() method calls per element and using setSize(int) method, we're setting the new size as same as vector current size and printing all the elements of vector.

package com.tutorialspoint;

import java.util.Vector;

public class VectorDemo {
   public static void main(String[] args) {

      // create an empty Vector vec with an initial capacity of 4      
      Vector<Integer> vec = new Vector<>(4);

      // use add() method to add elements in the vector
      vec.add(4);
      vec.add(3);
      vec.add(2);
      vec.add(1);

      // set new size to 4
      vec.setSize(4);

      // let us print all the elements available in vector
      System.out.println("Added numbers are :- "); 
      
      for (Integer number : vec) {         
         System.out.println("Number = " + number);
      }
   } 
} 

Let us compile and run the above program, this will produce the following result.

Added numbers are :- 
Number = 4
Number = 3
Number = 2
Number = 1

java_util_vector.htm

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