Chapter 20.6, Problem 20.6.3CP

Comparator interface:

Comparator interface offers the sequence of multiple sorting which offers the compare() method to sort the data.

• It helps the compare the data of different classes.
• The Comparable interface is present in java.util package.
• The lambda expression is used in Comparator interface to simply the code.

Create Comparator interface by using the lambda expression is given below:

//Create object for Loan and compare e1 and e2

(e1, e2) -> e1.getAnnualInterestRate() < e2.getAnnualInterestRate() ? -1 :

e1.getAnnualInterestRate() == e2.getAnnualInterestRate() ? 0 : 1

Explanation:

In the above code,

• Create the two objects for Loan such as “e1” and “e2”.
• Compare the annualInterestRate for e1 and the annualInterestRate for e2.
• Check whether it is less than means then it is return -1, otherwise check it is equal means then it is return 0. Otherwise, it is return 1.

Comparator.comparing() method:

• The Comparator.comparing() method is specially used to create the Comparator with help of property from an object.
• It helps to compare the data elements with help of key which is removed from object...