Chapter 8, Problem 1PP

Program Plan Intro

Implementation of class ComboLock

Program plan:

Filename: “ComboLock.java”

• Import the required packages.
• Define the “ComboLock” class.
  • Declare the class members.
  • Create a constructor “ComboLock()”.
    • Initialize the class members.
  • Create a method “reset()”.
    • Set the value of the class members.
  • Create a method “turnLeft()”.
    • Set the value of “currentNumber”.
    • If the value of “lockState” is equal to 1,
      • If the value of “currentNumber” is equal to “secret2”.
      • Set the value of “lockState” is equal to 2.
        • Else,
        • • Set the value of “validSoFar” as “false”.
  • Create a method “turnRight()”.
    • Set the value of “currentNumber”.
    • . If the value of “lockState” is equal to 0,
      • If the value of “currentNumber” is equal to “secret1”.
        • Set the value of “lockState” is equal to 1
    • . If the value of “lockState” is equal to 2,
      • If the value of “currentNumber” is equal to “secret3”.
        • Set the value of “lockState” is equal to 3
    • Else,
      • Set the value of “validSoFar” as “false”.
  • Create a method “open()”.
    • Return the value of “lockState”.

Filename: “ComboLockDemo.java”

• Import the required packages.
• Define the “ComboLockDemo” class
• Define the main method.
  • Create an object for “Random” class.
  • Set the value of “secret1” as 12.
  • Set the value of “secret2” as 12.
  • Set the value of “secret3” as 12.
  • Create an object for “ComboLockDemo” class.
  • Create an object for “Scanner” class.
  • Assign the value of “opened” and “turningRight”.
  • Iterate a “while” loop.
    • Print the instructions to the user.
    • Scan for the value of “ticks”.
    • If the condition is true,
      • Print the statement and return.
    • If the condition is true,
      • Call the method “turnRight()”.
    • If the condition is false,
      • Call the method “turnLeft()”.
      • Set the values of “turningRight” and “opened”.
    • Print the statement.