Java Vector removeAll() Method

The removeAll() method of Java Vector class deletes all the elements from the vector that are present in the specified collection.

Syntax

Following is the declaration of removeAll() method:

Parameter

Parameter	Description	Required/Optional
c	It is a collection of elements which will be removed from the vector.	Required

Return

The removeAll() method returns true if the vector changed as a result of the call.

Exceptions

NullPointerException- This method has thrown an exception if the vector contains one or more null elements and the specified collection does not support null elements or if the specified collection is null.

Compatibility Version

Java 1.2 and above

Example 1

import java.util.Vector;
public class VectorRemoveAllExample1 {  
	public static void main(String arg[]) {
	  //Create an empty Vec1
        Vector<Integer> vec1 = new Vector<>();
        //Add elements in the Vector1
        vec1.add(1);
        vec1.add(2);
        vec1.add(3);
        vec1.add(4);
        vec1.add(5); 
        //Displaying the Vector elements
        System.out.println("Vector: " + vec1); 
        System.out.println("Removing all the elements"); 
        //use removeAll() method
        vec1.removeAll(vec1);
        //Display the size of the Vector
        System.out.println("Size of the vector: "+vec1.size()); 
        }
}

Test it Now

Output:

Vector: [1, 2, 3, 4, 5]
Removing all the elements
Size of the vector: 0

Example 2

import java.util.Vector;
public class VectorRemoveAllExample2 {  
	public static void main(String arg[]) {
	  //Create an empty Vec1
        Vector<String> vec1 = new Vector<String>();
        //Add elements in the Vector1
        vec1.add("A");
        vec1.add("B");
        vec1.add("C");
        vec1.add("10");
        vec1.add("20"); 
        //Displaying the Vector1 elements
        System.out.println("Vector: " + vec1); 
        //Create an empty Vec2
        Vector<String> vec2 = new Vector<String>(); 
        //Add elements in the Vector2
        vec2.add("A");
        vec2.add("B");
        vec2.add("C"); 
        //use removeAll() method
        boolean changed = vec1.removeAll(vec2);
        //Print the result
        if (changed)
            System.out.println("Collection removed");
        else
            System.out.println("Collection not removed");
        //Display the final Vector
        System.out.println("Final Vector: " + vec1);
        }
}

Test it Now

Output:

Vector: [A, B, C, 10, 20]
Collection removed
Final Vector: [10, 20]

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