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Java applications consist of classes and their members. Classes exist in packages but can also be nested inside other classes.
===<code>
Whether it is a console or a graphical interface application the program must have an entrypoint of some sort. The entrypoint of the Java application is the <code>main</code> method. There can be more than one class with <code>main</code> method, but the main class is always defined externally (e.g. in a [[manifest file]]). The method must be <code>static</code> and is passed command-line arguments as an array of strings. Unlike [[C++]] or [[C Sharp (programming language)|C#]] it never returns a value and must return <code>void</code>.
<source lang=Java>
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