ConcurrentSkipListSet equals() method in Java
The equals() method of java.util.concurrent.ConcurrentSkipListSet is an inbuilt function in Java which compares the specified object with this set for equality. It returns True if the specified object is also a set. The two sets will said to be equal if they satisfies all of the conditions stated below:
- The two sets have the same size.
- Every member of the specified set is contained in this set.
This definition ensures that the equals method works properly across different implementations of the set interface.
Syntax:
ConcurrentSkipListSet.equals(Object o)
Parameters: The function returns a single parameter o i.e. the object to be compared for equality with this set
Return Value: The function returns boolean value. It returns true if the specified object is equal to this set, otherwise returns false.
Below programs illustrate the ConcurrentSkipListSet.equals() method:
Program 1: In this example both the set are equal.
// Java Program Demonstrate equals()// method of ConcurrentSkipListSet  import java.util.NavigableSet;import java.util.concurrent.ConcurrentSkipListSet;  class ConcurrentSkipListSetEqualsExample1 {    public static void main(String[] args)    {          // Initializing the set        ConcurrentSkipListSet<Integer>            set = new ConcurrentSkipListSet<Integer>();          // Adding elements to this set        set.add(10);        set.add(35);        set.add(20);        set.add(25);          // Creating a descending set object        NavigableSet<Integer> des_set = set.descendingSet();          // Checking if the set and des        if (set.equals(des_set))            System.out.println("Both the sets are equal");        else            System.out.println("Both the sets are not equal");          // Printing the elements of the set        System.out.println("Contents of the set: " + set);          // Printing the elements of the descending set        System.out.println("Contents of the descending set: " +                                                       des_set);    }} |
Output:
Both the sets are equal Contents of the set: [10, 20, 25, 35] Contents of the descending set: [35, 25, 20, 10]
Program 2: In this example both the set are not equal
// Java Program Demonstrate equals()// method of ConcurrentSkipListSet  import java.util.NavigableSet;import java.util.concurrent.ConcurrentSkipListSet;  class ConcurrentSkipListSetEqualsExample2 {    public static void main(String[] args)    {          // Initializing the set        ConcurrentSkipListSet<Integer>            set1 = new ConcurrentSkipListSet<Integer>();          ConcurrentSkipListSet<Integer>            set2 = new ConcurrentSkipListSet<Integer>();          // Adding elements to first set        set1.add(10);        set1.add(35);        set1.add(20);        set1.add(25);          // Adding elements to second set        set2.add(35);        set2.add(20);        set2.add(25);          // Checking if the set and des        if (set1.equals(set2))            System.out.println("Both the sets are equal");        else            System.out.println("Both the sets are not equal");          // Printing the elements of the set        System.out.println("Contents of the first set: " +                                                       set1);          // Printing the elements of the descending set        System.out.println("Contents of the second set: " +                                                       set2);    }} |
Output:
Both the sets are not equal Contents of the first set: [10, 20, 25, 35] Contents of the second set: [20, 25, 35]
