Vector removeAll() Method in Java

The java.util.vector.removeAll(Collection col) method is used to remove all the elements from the vector, present in the collection specified.

Syntax:

Vector.removeAll(Collection col)

Parameters: This method accepts a mandatory parameter col which is the collection whose elements are to be removed from the vector.

Return Value: This method returns true if the vector is altered due to the operation at all, else False.

Exception: The method throws NullPointerException if the specified collection is null.

Below programs illustrate the Java.util.Vector.removeAll(Collection col) method:

Program 1:

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// Java code to illustrate removeAll()
import java.util.*;
  
public class VectorDemo {
    public static void main(String args[])
    {
  
        // Creating an empty Vector
        Vector<String> vec_tor = new Vector<String>();
  
        // Use add() method to add elements in the Vector
        vec_tor.add("Geeks");
        vec_tor.add("for");
        vec_tor.add("Geeks");
        vec_tor.add("10");
        vec_tor.add("20");
  
        // Output the Vector
        System.out.println("Vector: " + vec_tor);
  
        // Creating an empty Vector
        Vector<String> colvec_tor = new Vector<String>();
  
        // Use add() method to add elements in the Vector
        colvec_tor.add("Geeks");
        colvec_tor.add("for");
        colvec_tor.add("Geeks");
  
        // Remove the head using remove()
        boolean changed = vec_tor.removeAll(colvec_tor);
  
        // Print the result
        if (changed)
            System.out.println("Collection removed");
        else
            System.out.println("Collection not removed");
  
        // Print the final Vector
        System.out.println("Final Vector: " + vec_tor);
    }
}

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Output:

Vector: [Geeks, for, Geeks, 10, 20]
Collection removed
Final Vector: [10, 20]

Program 2:

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// Java code to illustrate removeAll()
import java.util.*;
  
public class VectorDemo {
    public static void main(String args[])
    {
  
        // Creating an empty Vector
        Vector<Integer> vec_tor = new Vector<Integer>();
  
        // Use add() method to add elements in the Vector
        vec_tor.add(1);
        vec_tor.add(2);
        vec_tor.add(3);
        vec_tor.add(10);
        vec_tor.add(20);
  
        // Output the Vector
        System.out.println("Vector: " + vec_tor);
  
        // Creating an empty Vector
        Vector<Integer> colvec_tor = new Vector<Integer>();
  
        // Use add() method to add elements in the Vector
        colvec_tor.add(30);
        colvec_tor.add(40);
        colvec_tor.add(50);
  
        // Remove the head using remove()
        boolean changed = vec_tor.removeAll(colvec_tor);
  
        // Print the result
        if (changed)
            System.out.println("Collection removed");
        else
            System.out.println("Collection not removed");
  
        // Print the final Vector
        System.out.println("Final Vector: " + vec_tor);
    }
}

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Output:

Vector: [1, 2, 3, 10, 20]
Collection not removed
Final Vector: [1, 2, 3, 10, 20]


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