Java Vector containsAll() Method

The containsAll() method of Java Vector class is used to check the vector which is in use contains all of the elements in the specified Collection or not. It returns true if this vector contains all of the elements in the Collection, otherwise returns false.

Syntax:

Following is the declaration of containsAll() method:

Parameter:

Parameter	Description	Required/Optional
c	It is a collection whose elements will be tested for containment in the vector which is in use.	Required

Returns:

The containsAll() method returns true if this vector contains all of the elements in the specified collection.

Exceptions:

NullPointerException- This method has thrown an exception if the specified collection is null.

Compatibility Version:

Java 1.2 and above

Example 1:

import java.util.*;
public class VectorContainsAllExample1 {  
	public static void main(String arg[]) {
		//Create an empty Vector
		Vector<String> vc = new Vector<String>();
		//Add values in the vector
            vc.add("Facebook");
            vc.add("Whatsapp");
            vc.add("Twitter");
            vc.add("Instagram");
            //Create an empty list
            List<String> list = new ArrayList<String>();
            //Add values in the List
            list.add("Facebook");
            list.add("Whatsapp");
            System.out.println("Does vector contains all list elements?: "+vc.containsAll(list));
            list.add("Hindi100");
            System.out.println("Does vector contains all list elements?: "+vc.containsAll(list));
	      }            
}

Test it Now

Output:

Does vector contains all list elements?: true
Does vector contains all list elements?: false

Example 2:

import java.util.Vector;
public class VectorContainsAllExample2 {  
	public static void main(String arg[]) {
	   //Create an empty Vector1
	   Vector<Integer>  vector1 = new Vector<Integer>();
	   //Add element in vwctor1
	   vector1.add(11);
	   vector1.add(22);
	   vector1.add(33);
	   vector1.add(44);
	   //Create an empty Vector2
	   Vector<Integer>  vector2 = new Vector<Integer>();
	   //Add element in vector2
	   vector2.add(22);
	   vector2.add(33);
	   //Check the existence of vector2 in the vector1
	   System.out.println("Existence: "+vector1.containsAll(vector2)); 
	   //Lets add a new element to vector2
         vector2.add(101);
         //Checking again
	   System.out.println("Existence: "+vector1.containsAll(vector2)); 
	   }            
}

Test it Now

Output:

Existence: true
Existence: false

Example 3:

import java.util.Vector;
public class VectorContainsAllExample3 {  
	public static void main(String arg[]) {
	   //Create an empty Vector1
	   Vector<Integer>  vector1 = new Vector<Integer>(null);
	   //Create an empty Vector2
	   Vector<Integer>  vector2 = new Vector<Integer>();
	   //Check the existence of vector2 in the vector1
	   System.out.println("Existence: "+vector1.containsAll(vector2)); 	   
	   }            
}

Test it Now

Output:

Exception in thread "main" java.lang.NullPointerException
	at java.base/java.util.Vector.<init>(Vector.java:178)
	at myPackage.VectorContainsAllExample3.main(VectorContainsAllExample3.java:6)

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