Structure of Java Programs
Programming in Java consists of writing source code that defines one or more classes. Because Java is completely object-oriented, all Java code is inside a class definition. When a Java program runs, it uses these class definitions to create objects that contain all of the program variables and instructions.
 | In Java, there is no such thing as a global variable or any function that is not part of a class, and therefore an object. Java groups the various utility calls you might expect to find in a system library into classes, frequently as static methods. The implications of the static keyword are discussed in Chapters ... |
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