Create a Lockable Java interface with the following methods: setKey, lock, unlock, and locked. The setKey, lock, and unlock methods all accept an integer parameter representing the key. The key is created using the setKey method. The lock and unlock methods lock and unlock the object, but only if the key supplied is valid. The locked method returns a boolean indicating whether the object is locked or not. A Lockable object is one whose normal methods are protected: The methods cannot be invoked if the object is locked; they may be invoked if it is unlocked. Redesign and construct a Lockable version of the Coin class from Chapter 5.

Create a Lockable Java interface with the following methods: setKey, lock, unlock, and locked. The setKey, lock, and unlock methods all accept an integer parameter representing the key. The key is created using the setKey method. The lock and unlock methods lock and unlock the object, but only if the key supplied is valid. The locked method returns a boolean indicating whether the object is locked or not. A Lockable object is one whose normal methods are protected: The methods cannot be invoked if the object is locked; they may be invoked if it is unlocked. Redesign and construct a Lockable version of the Coin class from Chapter 5.

EBK JAVA PROGRAMMING

9th Edition

ISBN:9781337671385

Author:FARRELL

Publisher:FARRELL

Chapter11: Advanced Inheritance Concepts

Section: Chapter Questions

Problem 12PE

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