Chapter 18, Problem 5PP

Program Plan Intro

Finding largest element in an array list

Program plan:

Filename: “Measurable.java”

This code snippet creates an interface “Measurable”. In the code,

• Import the required packages.
• Define a class “Measurable”.
  • Define the class member “getMeasure()”.
  • Define the method “largest()”.
    • If the size of the “objects” is equal to 0,
      • Return a value “null”.
    • Declare a variable “largest” and set its value.
    • Iterate a “for” loop,
      • If “obj” is less than “largest”,
        • Set “largest” equal to “obj”.
    • Return “largest”.

Filename: “BankAccount.java”

This code snippet creates a class “BankAccount”. In the code,

• Define a class “BankAccount”.
  • Define the class member “balance”.
  • Define the constructor “BankAccount()”.
    • Set the value of “balance”.
  • Define the method “deposit()”.
    • Set the value of “balance”.
  • Define the method “withdraw()”.
    • Set the value of “balance”.
  • Define the method “getBalance()”.
    • Return the value of “balance”.
  • Define the method “getMeasure()”.
    • Return the value of “balance”.

Filename: “SavingsAccount.java”

This code snippet creates a class “SavingsAccount”. In the code,

• Define a class “SavingsAccount” by extending class “BankAccount”.
  • Define the class member “interestRate”.
  • Define the method “SavingsAccount()”.
    • Set the value of “initial” of class “BankAccount”.
    • Set the value of “interestRate”.
  • Define the method “monthEnd()”.

Filename: “MeasurableTester.java”

This code snippet creates a class “MeasurableTester”. In the code,

• Define a class “MeasurableTester”.
  • Define the “main” method.
    • Define an array list “accounts” and set the objects to it.
    • Add elements to “accounts”.
    • Call the method “largest()” and save the value to “largestAccount”.
    • Call the method “getBalance()” and print the value.
    • Print the expected value.
    • Define an array list “saccounts” and set the objects to it.
    • Add elements to “saccounts”.
    • Call the method “largest()” and save the value to “largestSavings”.
    • Call the method “getBalance()” and print the value.
    • Print the expected value.
    • Define an array list “all” and set the objects to it.
    • Add elements of “accounts” to “all”.
    • Add elements of “accounts” to “all”.
    • Call the method “largest()” and save the value to “largestAll”.
    • Call the method “getBalance()” and print the value.
    • Print the expected value.