Open In App

Vector removeAll() Method in Java

Improve
Improve
Like Article
Like
Save
Share
Report

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: 

Java




// 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);
    }
}


Output:

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

Program 2: 

Java




// 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);
    }
}


Output:

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

Time complexity: O(n^2). // n is the size of the vector.
Auxiliary Space: O(n).



Last Updated : 24 May, 2023
Like Article
Save Article
Previous
Next
Share your thoughts in the comments
Similar Reads