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Java Interfaces step by step solution with example

An interface is a collection of abstract methods. A class implements an interface, thereby inheriting the abstract methods of the interface. An interface is not a class. Writing an interface is similar to writing a class, but they are two different concepts. A class describes the attributes and behaviors of an object. An interface contains behaviors that a class implements. Unless the class that implements the interface is abstract, all the methods of the interface need to be defined in the class. An interface is similar to a class in the following ways: An interface can contain any number of methods. An interface is written in a file with a .java extension, with the name of the interface matching the name of the file. The bytecode of an interface appears in a .class file. Interfaces appear in packages, and their corresponding bytecode file must be in a directory structure that matches the package name. However, an interface is different from a class in several ways, ...
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how to setup java environment variables on Window 7 or window 8 or window xp

You should follow the below steps : Step 1: Installation of JDK:  Don't forget to install JDK on your system (if  not installed) because any tomcat requires the  Java 1.5 (Java 5) and Java 1.6 (Java 6) and then set the class path (environment variable) of JDK. Step 2: Setting the class path variable for JDK: Two methods are there to set the classpath. Set the class path using the following command. set PATH="C:\Program Files\Java\jdk1.5.0_08\bin";%PATH% The other way of setting the class path variable is: First right click on the My Computer->properties->advance->Environment Variables->path. Set bin directory path of JDK in the path variable. Other operating System : Windows XP Select Start , select Control Panel . double click System , and select the Advanced tab. Click Environment Variables . In the section System Variables , find the PATH environment variable and select it. Click Edit . If the PATH environment varia...
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How to install Java on WINDOW operating system

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