Lambda expression for the filter Program plan: In a file “Filter.java”, create an interface “Filter”, Declare the method “accept()”. In a file “Measurer.java”, create an interface “Measurer”, Declare the method “measure()”, In a file “BalanceFilter.java”, create a class “BalanceFilter” that implements “Filter” interface, Define the method “accept()”, Return the balance greater than “1000”. In a file “BalanceMeasurer.java”, create a class “BalanceMeasurer” that implements “Measurer” interface, Define the method “measure()”, Return the value obtained from the method “getBalance()”. In a file “BankAccount.java”, create a class “BankAccount”, Declare the variable. Define the constructor to create a bank account with “0” balance. Define the parameterized constructor to set the specified balance. Define the method “deposit()” to update the balance with the deposited amount. Define the method “withdraw()” to update the balance with withdrawal amount. Define the method “getBalance()” to return the current balance. Define the method “addInterest()”, Add the interest to the bank balance. In a file “Data.java”, create a class “Data”, Define the method “average()”, Initialize the variable. Make the loop for the objects, Check the condition, Update sum value. Increment the value of “number”. Check whether the value is positive, If it is true, return the value obtained by dividing sum by the value “number”. Otherwise, return “0”. In a file “FilterTester.java”, create s “FilterTester”, Define the method “main()”, Create an array of objects for “BankAccount” class. Call the constructor with “800” as parameter. Call the constructor with “2000” as parameter. Call the constructor with “3500” as parameter. Call the constructor with “4000” as parameter. Call the constructor with “1000” as parameter. Create an object for “BalanceMeasure”. Use lambda expression to get the balance using the method “getBalance()”. Print the value returned from “average()”. Print the expected value.

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Chapter 9, Problem 17PP

Program Plan Intro

Lambda expression for the filter

Program plan:

In a file “Filter.java”, create an interface “Filter”,

Declare the method “accept()”.

In a file “Measurer.java”, create an interface “Measurer”,

Declare the method “measure()”,

In a file “BalanceFilter.java”, create a class “BalanceFilter” that implements “Filter” interface,

Define the method “accept()”,

Return the balance greater than “1000”.

In a file “BalanceMeasurer.java”, create a class “BalanceMeasurer” that implements “Measurer” interface,

Define the method “measure()”,

Return the value obtained from the method “getBalance()”.

In a file “BankAccount.java”, create a class “BankAccount”,

Declare the variable.

Define the constructor to create a bank account with “0” balance.

Define the parameterized constructor to set the specified balance.

Define the method “deposit()” to update the balance with the deposited amount.

Define the method “withdraw()” to update the balance with withdrawal amount.

Define the method “getBalance()” to return the current balance.

Define the method “addInterest()”,

Add the interest to the bank balance.

In a file “Data.java”, create a class “Data”,

Define the method “average()”,

Initialize the variable.

Make the loop for the objects,

Check the condition,

Update sum value.

Increment the value of “number”.

Check whether the value is positive,

If it is true, return the value obtained by dividing sum by the value “number”.

Otherwise, return “0”.

In a file “FilterTester.java”, create s “FilterTester”,

Define the method “main()”,

Create an array of objects for “BankAccount” class.

Call the constructor with “800” as parameter.

Call the constructor with “2000” as parameter.

Call the constructor with “3500” as parameter.

Call the constructor with “4000” as parameter.

Call the constructor with “1000” as parameter.

Create an object for “BalanceMeasure”.

Use lambda expression to get the balance using the method “getBalance()”.

Print the value returned from “average()”.

Print the expected value.

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