 
JAVA PROGRAMMING
JAVA's
Magic the Bytecode
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The key that allows Java to solve both the security
and the portability problems just described is that the output of a Java
compiler is not executable code. Rather, it is bytecode. Bytecode is a
highly optimized set of instructions designed to be executed by standard
form, the JVM (Java Virtual Machine) is an interpreter for bytecode.
Translating a Java program into
bytecode helps makes it much easier to run a program in a wide variety of
environments. This reason is straightforward: only the JVM needs to be
implemented for each platform.
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