Create a Java interface named Lockable that has the setKey, lock, unlock, and locked methods. The key is represented as an integer argument that is sent to the setKey, lock, and unlock functions. The key is created using the setKey method. Only if the key provided is valid will the lock and unlock methods lock and unlock the object, respectively. The object's lock status is indicated by a boolean that the locked method returns. An object whose regular methods are protected is referred to as a lockable object: The methods cannot be called if the object is locked; they may be called if the item is unlocked. Create a Lockable version of the Coin class from Chapter 5 and implement it.
Create a Java interface named Lockable that has the setKey, lock, unlock, and locked methods. The key is represented as an integer argument that is sent to the setKey, lock, and unlock functions. The key is created using the setKey method. Only if the key provided is valid will the lock and unlock methods lock and unlock the object, respectively. The object's lock status is indicated by a boolean that the locked method returns. An object whose regular methods are protected is referred to as a lockable object: The methods cannot be called if the object is locked; they may be called if the item is unlocked. Create a Lockable version of the Coin class from Chapter 5 and implement it.
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
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Create a Java interface named Lockable that has the setKey, lock, unlock, and locked methods. The key is represented as an integer argument that is sent to the setKey, lock, and unlock functions. The key is created using the setKey method. Only if the key provided is valid will the lock and unlock methods lock and unlock the object, respectively. The object's lock status is indicated by a boolean that the locked method returns. An object whose regular methods are protected is referred to as a lockable object: The methods cannot be called if the object is locked; they may be called if the item is unlocked. Create a Lockable version of the Coin class from Chapter 5 and implement it.
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