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AbstractCollection containsAll() Method in Java with Examples

  • Last Updated : 26 Nov, 2018

The containsAll() method of Java AbstractCollection is used to check whether two Collections contain the same elements or not. It takes one collection as a parameter and returns True if all of the elements of this collection is present in the other collection.

Syntax:

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AbstractCollection.containsAll(Collection C)

Parameters: The parameter C is a Collection. This parameter refers to the collection whose elements occurrence is needed to be checked in this collection.

Return Value: The method returns True if this collection contains all the elements of other Collection otherwise it returns False.



Below programs illustrate the AbstractCollection.conatinsAll() method:

Program 1:




// Java code to illustrate boolean containsAll()
  
import java.util.*;
  
class AbstractCollectionDemo {
    public static void main(String args[])
    {
  
        // Creating an empty Collection
        AbstractCollection<String>
            abs = new LinkedList<String>();
  
        // Use add() method to
        // add elements in the collection
        abs.add("Geeks");
        abs.add("for");
        abs.add("Geeks");
        abs.add("10");
        abs.add("20");
  
        // Creating another empty Collection
        AbstractCollection<String>
            abs2 = new LinkedList<String>();
  
        // Use add() method to
        // add elements in the collection
        abs2.add("Geeks");
        abs2.add("for");
        abs2.add("Geeks");
        abs2.add("10");
        abs2.add("20");
  
        // Check if the collection
        // contains same elements
        System.out.println("\nBoth the collections same: "
                           + abs.containsAll(abs2));
    }
}
Output:
Both the collections same: true

Program 2:




// Java code to illustrate boolean containsAll()
  
import java.util.*;
  
class AbstractCollectionDemo {
    public static void main(String args[])
    {
  
        // Creating an empty Collection
        AbstractCollection<String>
            abs = new LinkedList<String>();
  
        // Use add() method to
        // add elements in the collection
        abs.add("Geeks");
        abs.add("for");
        abs.add("Geeks");
  
        // Creating another empty Collection
        AbstractCollection<String>
            abs2 = new LinkedList<String>();
  
        // Use add() method to
        // add elements in the collection
        abs2.add("10");
        abs2.add("20");
  
        // Check if the collection
        // contains same elements
        System.out.println("\nBoth the collections same: "
                           + abs.containsAll(abs2));
    }
}
Output:
Both the collections same: false



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