Java2007-09-08
Use of try and catch in Java
Although the default exception handler provided by the Java run-time system is useful for debugging, you will usually want to handle an exception yourself. Doing so provides two be
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Java2007-09-08
Basics of Exception Handling in Java
A Java exception is an object that describes an exceptional (that is, error) condition that has occurred in a piece of code. When an exceptional condition arises, an object represe
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A Tutorial on importing packages in Java
Given that packages exist and are a good mechanism for compartmentalizing diverse classes from each other, it is easy to see why all of the built-in Java classes are stored in pack
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What is a Java CLASSPATH and why you need it?
While Java packages solve many problems from an access control and name-space-collision perspective, they cause some curious difficulties when you compile and run programs. This is
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What is a Java Package and how to use it?
In Java, a unique name has to be used for each class to avoid name collisions. After a while, without some way to manage the name space, you could run out of convenient, descriptiv
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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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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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