java.util.Vector.removeAll() Method

Description

The removeAll(Collection<?> c) is used to remove all the elements of the vector that are contained in the specified Collection.

Declaration

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

public boolean removeAll(Collection<?> c)

Parameters

c − This is a collection of elements to be removed from the Vector

Return Value

The method call returns true if this Vector changed as a result of the call.

Exception

NullPointerException − This exception is thrown if the specified collection is null.

Example

The following example shows the usage of java.util.Vector.removeAll() 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 all the elements available in vector
      System.out.println("Added numbers are :- "); 
      
      for (Integer number : vec) {         
         System.out.println("Number = " + number);
      }
      System.out.println("Size of the vector: "+vec.size());

      // let us remove all the elements
      System.out.println("Removing all the elements"); 
      vec.removeAll(vec);
      System.out.println("Size of the vector: "+vec.size());       
   }     
}

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
Size of the vector: 4
Removing all the elements
Size of the vector: 0

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