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CHAPTER 7 Classes
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Remember that a class definition is like a cookie cutter and not a cookie This means that you must use the class definition to make a real copy of the class, which is called an instance of the class You do this by declaring an instance of the class within your program When an instance is declared, Java reserves memory for all instance variables and then calls the constructor Initial values are then stored in memory, if the constructor initializes instance variables Also, any other statements within the constructor are executed Here s how to declare an instance of a class This statement probably looks familiar because it is basically the same statement used to declare an array (see 5)
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myClass x = new myClass();
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Three tasks occur in this statement First, the new operator tells Java to reserve a block of memory for the instance This block of memory is large enough to store instance variable(s) The new operator returns the address of that block of memory Second, a reference to an instance of myClass is declared, which is called x The reference is declared by using the name of the class This is called the class type Finally, the third task is to assign the first address of the block of memory of the instance to the reference The reference (in this case, x) is used anytime you want to refer to the instance within the program Although the previous example declared a reference and an instance of a class in one statement, these declarations can be placed in two statements, as shown in the next example The first statement declares the reference, and the second statement assigns the instance to the reference
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myClass x; x = new myClass();
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Programmers declare a reference separately from the declaration of an instance of a class in order to assign different instances to the same reference, unless the reference is declared final Any reference declared final cannot be reassigned a value You ll see how this is done in the next example Notice that the next example begins by declaring three references to myClass The next two statements declare an instance of myClass, which is assigned to reference x and reference y, respectively Next, the reference x is assigned to the reference current Both x and current refer the same instance of the class because the value of x points to the memory block that contains the instance This memory address, stored in reference x, is
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copied (assigned) to reference current This mean that both x and current can be used to access members of the same instance because both point to the same address in memory The last statement assigns the value of reference y to current The value of y is the memory address of the second instance of myClass Both y and current point to the same memory address, which contains the second instance of the class Programmers use this technique to switch between instances of classes
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myClass x = new y = new current current x,y,current; myClass(); myClass(); = x; = y;
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In the previous examples, the new operator is followed by the class name The class name actually calls the constructor of the class (see the section titled Constructor ) The new operator dynamically allocates memory for the instance of the class Dynamic allocation means that Java reserves memory at run time rather than at compile time However, it is possible that sufficient memory isn t available in the computer that runs your program If this occurs, an exception is thrown by the new operator (see 9)
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