Practice Comparable Interface (15.8.1) - Collections and Generics

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6 sample questions

Question 1.
Define the Comparable interface in Java.
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Think about how objects can be compared.
Question 2.
What method must be implemented by a class that implements Comparable?
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It's the main method for comparison.
3Question 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
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Think about what helps in ordering objects.
4Question 4.
The compareTo method must return a negative number if the first object is greater than the second.
- True
- False
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Think about the definition of greater.
Question 5.
Create a class Employee that implements Comparable and sorts employees based on their salary. Write the full code with the compareTo method implemented.
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Focus on defining which employee's salary is higher.
Question 6.
Given a list of integers, sort them using the Comparable interface. Explain what happens internally during sorting.
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How does the sorting mechanism use compareTo?

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