Interfaces are collections of method signatures. A interface type can hold any value that implements those methods. The empty interface is an interface type that specifies zero methods. A type assertion provides access to an interface underlying concrete value. Two interfaces are equal if they have equal concrete values and identical dynamic types, or if both are nil.

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The abstract keyword is used in Java for abstraction. The abstraction is the process of selecting data and displaying only the relevant details to the object. If helps to reduce the programing complexity and the efort.

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Keywords are special words in the programing language which have reserved use in the language. Keywords may not be used as identifiers in Java; for example you cannot declare a field whose name is a keyword.

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How to create Java Custom Annotation. A simple example of creating Annotations in Java and usage by calling the Reflection API.

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How to read XML file in Java using SAX Parser.

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How to generate JAXB classes with xjc. Command line: xjc -d src -p com.admfactory.client schema.xsd

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