15.8.1. Comparable Interface

Try these first

1. 1.

   Define the Comparable interface in Java.

   Hint

   Think about how objects can be compared.

2. 2.

   What method must be implemented by a class that implements Comparable?

   Hint

   It's the main method for comparison.

3. 3.

   What is the main purpose of the Comparable interface in Java?

   • To implement data structure methods
   • To create custom objects
   • To define a natural ordering for objects

   Hint

   Think about what helps in ordering objects.

4. 4.

   The compareTo method must return a negative number if the first object is greater than the second.

   • True
   • False

   Hint

   Think about the definition of greater.

5. 5.

   Create a class Employee that implements Comparable and sorts employees based on their salary. Write the full code with the compareTo method implemented.

   Hint

   Focus on defining which employee's salary is higher.

6. 6.

   Given a list of integers, sort them using the Comparable interface. Explain what happens internally during sorting.

   Hint

   How does the sorting mechanism use compareTo?