By Michael Ernest
This full-color advisor delivers an effective starting place within the basics of Java SE 7 programming, from middle programming innovations to utilizing Java language instruments and using stable strategy. through the books finish, youll manage to deal with latest Java code or even write a few small courses. This sensible e-book additionally prepares you for the Oracle OCA: Java SE 7 Programmer certification examination (1Z0-803), overlaying the entire issues you must understand for the examination.
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This full-color advisor grants an effective origin within the basics of Java SE 7 programming, from middle programming thoughts to utilizing Java language instruments and using reliable method. through the books finish, youll manage to deal with current Java code or even write a few small courses. This useful ebook additionally prepares you for the Oracle OCA: Java SE 7 Programmer certification examination (1Z0-803), masking all of the subject matters you must be aware of for the examination.
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You might have wondered where the calling starts? Which method is the first to get called, and who calls it? The answer for a Java program is its main() method. A main() method is the gateway between the startup of a Java process, which is managed by the Java Virtual Machine (JVM), and the beginning of the programmer’s code. The JVM calls on the underlying system to allocate memory and CPU time, access files, and so on. This happens behind the scenes normally, so if you run java -version on a JVM-configured system, you don’t see anything happening beyond the intended output.
The keyword public is what’s called an access modifier. It declares this method’s level of exposure to potential callers in the program. Naturally, public means anyone in the program. The least-open access modifier is private, which restricts visibility to methods in the same class. Java keywords are reserved by the language for a special purpose. These words can’t be used to name a class, method, or variable. There are four access modes altogether: protected is one. The default access mode has no keyword.