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2: Declarations and Access Control
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Why on earth (or the planet of your choice) would you want to do that Normally, you won t. But one of the more common reasons is to name an argument with the same name as the instance variable to which the parameter will be assigned. The following (but wrong) code is trying to set an instance variable s value using a parameter:
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class Foo { int size = 27; public void setSize(int size) { size = size; // which size equals which size } }
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So you ve decided that for overall readability you want to give the argument the same name as the instance variable its value is destined for, but how do you resolve the naming collision Use the keyword this. The keyword this always always always refers to the object currently running. The following code shows this in action:
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class Foo { int size = 27; public void setSize(int size) { this.size = size; // this.size means the current object's // instance variable for size } }
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Final Variables Declaring a variable with the final keyword makes it impossible to reinitialize that variable once it has been initialized with an explicit value (notice we said explicit rather than default). For primitives, this means that once the variable is assigned a value, the value can t be altered. For example, if you assign 10 to the int variable x, then x is going to stay 10, forever. So that s straightforward for primitives, but what does it mean to have a final object reference variable A reference variable marked final can t ever be reassigned to refer to a different object. The data within the object, however, can be modified, but the reference variable cannot be changed. In other words, you can use a final reference to modify the object it refers to, but you can t modify the reference variable to make it refer to a different object. Burn this in: there are no final objects, only final references.
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Declarations and Modifiers (Exam Objective 1.2)
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You might need to remind yourself what the value of a reference variable actually is. A reference variable s value in other words, the bit pattern the variable holds is not an object. Just as the value of a primitive variable is the bit pattern representing the primitive (for example, the bits representing the integer value 2), the value of a reference variable is a bit pattern representing, well, a reference. We re not using traditional pointers in Java, but you can still think of it as a pointer (not necessarily a pointer to an object, but a pointer to a pointer to ). A reference variable holds bits that represent, in a platform-dependent format, a way to get to an object. That s really all we care about, and all we re even allowed to know about reference variables in Java, unless you happen to be one of the developers of a JVM. Final instance variables don t have to be explicitly initialized in the same line in which they re declared, but the compiler will make sure that the final variable has a value by the time the constructor has completed. Don t count on the default value for final variables, though, because a final variable even if it s an instance variable won t be given one. The rule is: if you declare a final instance variable, you re obligated to give it an explicit value, and you must do so by the time the constructor completes. Look at the following code:
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class FinalTest{ final int x; // Will not work unless x is assigned in the constructor public void showFinal() { System.out.println("Final x = " + x); } }
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Attempting to compile the preceding code gives us the following:
%javac FinalTest.java FinalTest.java:2: Blank final variable 'x' may not have been initialized. It must be assigned a value in an initializer, or in every constructor. final int x; 1 error
If you declare an instance variable as final, but don t give it an explicit value at the time you declare it, the variable is considered a blank final. The final instance variable can stay blank only until the constructor completes.
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