java.util.Vector.clear() Method

Description

The clear() method is used to remove all of the elements from this Vector. The Vector will be empty after this call, unless it throws an exception.

Declaration

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

public void clear()

Parameters

• This method does not take any parameter as input.

Return Value

The return type is void so it does not return any value.

Exception

UnsupportedOperationException − This exception is thrown if the clear method is not supported by the Collection.

Example

The following example shows the usage of java.util.Vector.clear() method.

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<Integer>(4);

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

      // let us print the size of the vector
      System.out.println("Size of the vector after addition :"+vec.size()); 
      System.out.println("Added numbers are :- "); 
      
      for (Integer number : vec) {         
         System.out.println("Number = " + number);
      }

      // let us clear the vector
      vec.clear();

      // let us print the size of the vector
      System.out.println("Size of the vector after clearing :"+vec.size());       
   } 
}

Let us compile and run the above program, this will produce the following result.The size of the vector after calling the clear() method is 0.

Size of the vector after addition :4
Added numbers are :- 
Number = 4
Number = 3
Number = 2
Number = 1
Size of the vector after clearing :0

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