HashSet containsAll() method in Java with Example
Last Updated :
24 Dec, 2018
The containsAll() method of Java HashSet is used to check whether two sets contain the same elements or not. It takes one set as a parameter and returns True if all of the elements of this set is present in the other set.
Syntax:
public boolean containsAll(Collection C)
Parameters: The parameter C is a Collection. This parameter refers to the set whose elements occurrence is needed to be checked in this set.
Return Value: The method returns True if this set contains all the elements of other set otherwise it returns False.
Below programs illustrate the HashSet.containsAll() method:
Program 1:
import java.util.*;
class HashSetDemo {
public static void main(String args[])
{
HashSet<String>
set = new HashSet<String>();
set.add( "Geeks" );
set.add( "for" );
set.add( "Geeks" );
set.add( "10" );
set.add( "20" );
System.out.println( "HashSet 1: "
+ set);
HashSet<String>
set2 = new HashSet<String>();
set2.add( "Geeks" );
set2.add( "for" );
set2.add( "Geeks" );
set2.add( "10" );
set2.add( "20" );
System.out.println( "HashSet 2: "
+ set2);
System.out.println( "\nDoes set 1 contains set 2: "
+ set.containsAll(set2));
}
}
|
Output:
HashSet 1: [Geeks, for, 20, 10]
HashSet 2: [Geeks, for, 20, 10]
Does set 1 contains set 2: true
Program 2:
import java.util.*;
class HashSetDemo {
public static void main(String args[])
{
HashSet<String>
set = new HashSet<String>();
set.add( "Geeks" );
set.add( "for" );
set.add( "Geeks" );
System.out.println( "HashSet 1: "
+ set);
HashSet<String>
set2 = new HashSet<String>();
set2.add( "10" );
set2.add( "20" );
System.out.println( "HashSet 2: "
+ set2);
System.out.println( "\nDoes set 1 contains set 2: "
+ set.containsAll(set2));
}
}
|
Output:
HashSet 1: [Geeks, for]
HashSet 2: [20, 10]
Does set 1 contains set 2: false
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