SortedSet containsAll() method in Java with Examples
Last Updated :
12 Jul, 2025
The
containsAll() method of
Java SortedSet 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.
Note: The containsAll() method in
SortedSet is inherited from the
Set interface in Java.
Below programs illustrate the Set.containsAll() method:
Program 1:
Java
// Java code to illustrate
// Set containsAll()
import java.util.*;
class SortedSetDemo {
public static void main(String args[])
{
// Creating an empty set
SortedSet<String>
set = new TreeSet<String>();
// Use add() method to
// add elements in the set
set.add("Geeks");
set.add("for");
set.add("Geeks");
set.add("10");
set.add("20");
// prints the set
System.out.println("Set 1: "
+ set);
// Creating another empty set
Set<String>
set2 = new HashSet<String>();
// Use add() method to
// add elements in the set
set2.add("Geeks");
set2.add("for");
set2.add("Geeks");
set2.add("10");
set2.add("20");
// prints the set
System.out.println("Set 2: "
+ set2);
// Check if the set
// contains same elements
System.out.println(
"\nDoes set 1 contains set 2?: "
+ set.containsAll(set2));
}
}
Output:
Set 1: [10, 20, Geeks, for]
Set 2: [Geeks, for, 20, 10]
Does set 1 contains set 2?: true
Program 2:
Java
// Java code to illustrate
// boolean containsAll()
import java.util.*;
class SortedSetDemo {
public static void main(String args[])
{
// Creating an empty set
SortedSet<String>
set = new TreeSet<String>();
// Use add() method to
// add elements in the set
set.add("Geeks");
set.add("for");
set.add("Geeks");
// prints the set
System.out.println("Set 1: "
+ set);
// Creating another empty set
Set<String>
set2 = new HashSet<String>();
// Use add() method to
// add elements in the set
set2.add("10");
set2.add("20");
// prints the set
System.out.println("Set 2: "
+ set2);
// Check if the set
// contains same elements
System.out.println(
"\nDoes set 1 contains set 2: "
+ set.containsAll(set2));
}
}
Output:
Set 1: [Geeks, for]
Set 2: [20, 10]
Does set 1 contains set 2: false
Reference:
https://docs.oracle.com/javase/7/docs/api/java/util/Set.html#containsAll(java.util.Collection)
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