Big Java Late Objects
Big Java Late Objects
2nd Edition
ISBN: 9781119330455
Author: Horstmann
Publisher: WILEY
Question
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Chapter 18, Problem 3PP
Program Plan Intro

Pair of minimum and maximum

Program plan:

Filename: “Pair.java”

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

  • Define a class “Pair”.
    • Declare the class members “first” and “second”.
    • Define the constructor “Pair()”.
      • Set the class members.
    • Define the getter “getFirst()”.
      • Return the value of “first”.
    • Define the getter “getSecond()”.
      • Return the value of “second”.

Filename: “PairUtil.java”

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

  • Define a class “PairUtil”.
    • Define the method “minmax()”.
      • If the length of “a” equal to “0”,
        • Return “null”.
      • Declare a variable “min” of type “E” and set “a[0]” to it.
      • Declare a variable “max” of type “E” and set “a[0]” to it.
      • Iterate a “for” loop,
        • If the value of “element” is less than “min”,
          • Set “min” equal to “element”.
      • If the value of “element” is greater than “max”,
        • Set the value of “max” equal to “element”.
      • Return the pair of “min” and “max”.

Filename: “BankAccount.java”

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

  • Define a class “BankAccount”.
    • Define the class member “balance”.
    • Define the method “BankAccount()”.
      • Set the value of “balance”.
    • Define the method “BankAccount()”.
      • Set the value of “balance”.
    • Define the method “deposit()”.
      • Set the value of “newBalance”.
      • Set the value of “balance”.
    • Define the method “withdraw()”.
      • Set the value of “newBalance”.
      • Set the value of “balance”.
    • Define the method “getBalance()”.
      • Return the value of “balance”.
    • Define the method “compareTo()”.
      • Set the value of “d”.
      • If the value of “d” is less than 0,
        • Return “-1”.
          • If the value of “d” is greater than 0,
            • Return “1”.
          • Return “0”.

Filename: “SavingsAccount.java”

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

  • Define a class “SavingsAccount”.
    • Define the class member “interestRate”.
    • Define the method “SavingsAccount()”.
      • Set the value of “interestRate”.
    • Define the method “addInterest()”.
      • Set the value of “interest”.
      • Call the method “deposit()”.

Filename: “MinMaxTester.java”

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

  • Define a class “MinMaxTester”.
    • Define the “main” method.
      • Define an object array “accounts” and set the objects to it.
      • Call the method “deposit()” to add elements to “accounts”.
      • Iterate a “for” loop,
        • Call the method “addInterest()” on “a”.
      • Define a pair “mm”.
      • Call the method “getFirst().getBalance()” and print the result on the screen.
      • Print the expected result.
      • Call the method “getSecond().getBalance()” and print the result on the screen.
      • Print the expected result.

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