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2. Java packages
Java comes with a rich set of classes grouped by domain in different packages. This de facto standardization of many classes should avoid the problems encountered with C++, where each compiler editor has developed its own classes, making it difficult to recompile a C++ source program in a development environment different from the original one. The wide variety of classes offered in Java packages makes programming complex applications quick and easy. In this section, we give a brief overview of what's available.
2.1 The java.lang package
The java.lang package contains the basic Java classes: Object, String, Math, Thread, etc. The import directive java.lang.* ; is implicit.
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References
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Microsoft, Visual J# http://msdn.microsoft.com/vjsharp
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