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.