Java2007-09-08
Abstract classes in Java
There are situations in which you will want to define a superclass that declares the structure of a given abstraction without providing a complete implementation of every method. T
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Java2007-09-08
Method Overriding in Java
In a class hierarchy, when a method in a subclass has the same name and type signature as a method in its superclass, then the method in the subclass is said to override the method
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Basics of Inheritance in Java
To inherit a class, you simply incorporate the definition of one class into another by using the extends keyword. To see how, let's begin with a short example. The following progra
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static keyword in Java
There will be times when you will want to define a class member that will be used independently of any object of that class. Normally a class member must be accessed only in conjun
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Method Overloading (function overloading) in Java
In Java it is possible to define two or more methods within the same class that share the same name, as long as their parameter declarations are different. When this is the case, t
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Garbage Collection in Java
Since objects are dynamically allocated by using the new operator, you might be wondering how such objects are destroyed and their memory released for later reallocation. In some l
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Java2007-09-08
this keyword in Java
Sometimes a method will need to refer to the object that invoked it. To allow this, Java defines the this keyword. this can be used inside any method to refer to the current object
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Use of - new - in Java
The new operator dynamically allocates memory for an object. It has this general form:
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Use of return statement in Java
The last control statement is return. The return statement is used to explicitly return from a method. That is, it causes program control to transfer back to the caller of the meth
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Use of continue statement in Java
Sometimes it is useful to force an early iteration of a loop. That is, you might want to continue running the loop, but stop processing the remainder of the code in its body for th
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Using break as a Form of Goto
In addition to its uses with the switch statement and loops, the break statement can also be employed by itself to provide a "civilized" form of the goto statement. Java does not h
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Using break to Exit a Loop
By using break, you can force immediate termination of a loop, bypassing the conditional expression and any remaining code in the body of the loop. When a break statement is encoun
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