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Introduction

Java implements many, although not all, object concepts. A Java program comprises of a set of classes. All program instructions must be defined inside methods, which are parts of classes. 

Some other programming languages support the concept of "global" data and sub-programs (called functions or procedures or some such term in other languages). Global data and sub-programs are those hat are accessible to all parts of a software system. There are no "global' sub-programs or data permitted in Java.


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