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ConcurrentSkipListSet equals() method in Java

Last Updated : 17 Sep, 2018
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.
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
Output: 
Both the sets are not equal
Contents of the first set: [10, 20, 25, 35]
Contents of the second set: [20, 25, 35]
Reference: https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/ConcurrentSkipListSet.html#equals-java.lang.Object-
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