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Of course, there are many nuances that the preceding rules do not address, and special cases cause one or more rules to be violated But, in general, if you follow these rules, you will be creating resilient objects that are not easily misused
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Controlling Access: A Case Study
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To better understand the how and why behind access control, a case study is useful One of the quintessential examples of object-oriented programming is a class that implements a stack As you probably know, a stack is a data structure that implements a last-in, first-out list Its name comes from the analogy of a stack of plates on a table The first plate on the table is the last one to be used A stack is a classic example of object-oriented programming because it combines storage for information along with the methods that access that information Thus, a stack is a data engine that enforces the last-in, first-out usage Such a combination is an excellent choice for a class in which the members that provide storage for the stack are private, and public methods provide access By encapsulating the underlying storage, it is not possible for code that uses the stack to access the elements out of order A stack defines two basic operations: push and pop A push puts a value onto the top of the stack A pop removes a value from the top of the stack Thus, a pop is consumptive; once a value has been popped off the stack, it has been removed and cannot be accessed again The example shown here creates a class called Stack that implements a stack The underlying storage for the stack is provided by a private array The push and pop operations are available through the public methods of the Stack class Thus, the public methods enforce the last-in, first-out mechanism As shown here, the Stack class stores characters, but the same mechanism could be used to store any type of data:
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// A stack class for characters using System; class Stack { // These members are private char[] stck; // holds the stack int tos; // index of the top of the stack // Construct an empty Stack given its size public Stack(int size) { stck = new char[size]; // allocate memory for stack tos = 0; } // Push characters onto the stack public void Push(char ch) { if(tos==stckLength) { ConsoleWriteLine(" -- Stack is full"); return; } stck[tos] = ch; tos++; } // Pop a character from the stack
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8:
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A Closer Look at Methods and Classes
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public char Pop() { if(tos==0) { ConsoleWriteLine(" -- Stack is empty"); return (char) 0; } tos--; return stck[tos]; } // Return true if the stack is full public bool IsFull() { return tos==stckLength; } // Return true if the stack is empty public bool IsEmpty() { return tos==0; } // Return total capacity of the stack public int Capacity() { return stckLength; } // Return number of objects currently on the stack public int GetNum() { return tos; } }
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PART I PART I PART I
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Let s examine this class closely The Stack class begins by declaring these two instance variables:
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// These members are private char[] stck; // holds the stack int tos; // index of the top of the stack
The stck array provides the underlying storage for the stack, which in this case holds characters Notice that no array is allocated The allocation of the actual array is handled by the Stack constructor The tos member holds the index of the top of the stack Both the tos and stck members are private This enforces the last-in, first-out stack mechanism If public access to stck were allowed, then the elements on the stack could be accessed out of order Also, since tos holds the index of the top element in the stack, manipulations of tos by code outside the Stack class must be prevented in order to avoid corruption of the stack Access to stck and tos is available, indirectly, to the user of Stack through the various public methods described shortly The stack constructor is shown next:
// Construct an empty Stack given its size public Stack(int size) { stck = new char[size]; // allocate memory for stack tos = 0; }
Part I:
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