When a class implements to comparable interface what method must also be implemented?

When a class implements to comparable interface what method must also be implemented?

compareTo() method. For any class to support natural ordering, it should implement the Comparable interface and override it’s compareTo() method. It must return a negative integer, zero, or a positive integer as this object is less than, equal to, or greater than the specified object.

What implements the Comparable interface?

Since the Member class implements the Comparable interface, it is possible to sort the list by using the sorted method.

Can we implement comparable interface?

We can implement the Comparable interface with the Movie class, and we override the method compareTo() of Comparable interface.

What are the benefits of implementing the Comparable interface?

The benefit of implementing the interface is that some methods specifically require object that implements the Comparable interface. It gives them a guarantee that the object you’re passing has a compareTo method with the correct signature.

What is the purpose of comparable interface?

Java Comparable interface is used to order the objects of the user-defined class. This interface is found in java. lang package and contains only one method named compareTo(Object). It provides a single sorting sequence only, i.e., you can sort the elements on the basis of single data member only.

Why would you implement a comparable interface for your class?

Comparable is used to compare instances of your class. We can compare instances from many ways that is why we need to implement a method compareTo in order to know how (attributes) we want to compare instances.

What is comparable and Comparator interface?

Comparable and comparator both are an interface that can be used to sort the elements of the collection. Comparator interface sort collection using two objects provided to it, whereas comparable interface compares” this” refers to the one objects provided to it.

What is comparable and comparator interface?

Is Comparator A interface?

Method 2: Using comparator interface- Comparator interface is used to order the objects of a user-defined class. This interface is present in java. util package and contains 2 methods compare(Object obj1, Object obj2) and equals(Object element). Using a comparator, we can sort the elements based on data members.