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Oracle Certified Associate, Java SE 7 Programmer Study Guide by Richard M. Reese

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Investigating the Java application development process

Java source code is compiled to intermediate bytecode. The bytecode is then interpreted at runtime on any platform that has a Java Virtual Machine (JVM). However, this statement is somewhat misleading as Java technology will often compile bytecode directly to machine code. There have been numerous Just-In-Time compiler improvements that speed up the execution of Java applications that often will run nearly as fast as, or sometimes even faster than, natively-compiled C or C++ applications.

Java source code is found in files that end with a .java extension. The Java compiler will compile the source code to a bytecode representation and store these bytecodes in a file with a .class extension. ...

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