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Garbage Collection
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Your program can access members of a class as long as the instance of the class remains in scope, which you learned about previously in this chapter Although an instance may go out of scope, the instance remains in memory until Java garbage collection removes it In some computer languages, such as C and C++, a programmer can remove any instance or data type from memory that is declared dynamically, such as you do using
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CHAPTER 7 Classes
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the new operator in Java For example, the delete keyword instructs C and C++ to remove an object or data type from memory and make that memory available for other use You cannot explicitly direct Java to remove from memory an instance or anything else that is declared dynamically Instead, Java removes it behind the scenes without your intervention The good thing about garbage collection is that you won t forget to release unneeded memory The not-so-good thing is that you have no control over when memory is released This can become problematic if you have a memoryintense program and a limited amount of available memory on the computer that runs your program Simply said, you cannot release memory for use by another part of your program Only Java can release memory at Java s own schedule
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The finalize() Method
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The finalize() method is another special method member of a class The finalize() method member is called immediately before memory allocated for an instance is released by Java s garbage collection You might be asking yourself whether the finalize() method member is an alternative to using a destructor in your class definition The answer is no A destructor, as you ll recall, is a special method member that is called when an instance of a class goes out of scope Although an instance goes out of scope, the instance remains in memory until it is picked up by Java s garbage collection The finalize() method member is called after the instance goes out of scope and immediately before the instance is picked up by Java s garbage collection That is, the finalize() method member is called after the destructor is called and before the instance is removed from memory Programmers place statements within the finalize() method member that release resources, such as those acquired to connect the program to a network or to a file The following example shows how to define a finalize() method member of a class You must designate the finalize() method member as having protected access by using the protected access specifier, and you must use void as the return type because finalize() does not return any value after it executes Any statement that you want executed when finalize() is called must be placed within the body of the finalize() method member
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class Demo { public static void main (String args[]) { myClass x = new myClass(); }
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} class myClass { int student; myClass(){ student = 0; } protected void finalize (){ //Place statements here } }
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Inner Classes
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A class definition can contain the definition of another class This is called nested classes The two kinds of nested classes are static nested classes and nonstatic nested classes A static nested class is one that is designed with a static modifier and cannot directly access members of its enclosing class Instead, it must create an instance of the enclosing class and use the instance to access members of the enclosing class Nested classes are rarely used A nonstatic class is called an inner class and is commonly used by programmers An inner class is defined within an enclosing class The enclosing class is referred to as an outer class An inner class has access to all members of the outer class directly without having to declare an instance of the outer class The inner class can contain instance variables and method members However, only the inner class knows those members The outer class can access members of an inner class by declaring an instance of the inner class and then using the instance to access members of the inner class The inner class is not accessible from outside the outer class definition This means that you cannot declare an instance of an inner class within your program An instance of an inner class can only be declared within the definition of the outer class The following example illustrates how this is done This example defines a class called Outer Within the Outer class definition is the definition of the Inner class You ll notice there isn t anything unusual about these definitions They look similar to other class definitions used in this chapter However, notice how the instance variable student is displayed on the screen in this example The instance variable student is declared as a member of the Outer class, as is the display() member method The display() method member doesn t contain statements that directly display the instance variable on the
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