Chapter 20.6, Problem 20.6.2CP

Explanation of Solution

Comparable interface:

Comparable interface offers the sequence of single sorting which offers the compareTo() method to sort the data.

• It helps the compare the data of same classes.
• The Comparable interface is present in java.lang package.

Class to implement the Comparable interface is given below:

//Class A is implements the Comparable interface

public class A implements Comparable<A>

{

//Method definition

public int compareTo(A o)

{

//Return the value

return variable;

}

}

Explanation:

In the above code,

• Define the class with name of “A” which is implements the Comparable interface.
• This interface contains the compareTo() method to return the value.

“Yes”, two instances of the “A” class comparable.

Reason:

• Comparable interface helps the compare the data of same classes.
• It offers the compareTo() method to sort the data.

Class to implement the Comparator interface is given below:

/*Class B is implements the Comparator interface with type "B1"...