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After the first compilation, the bytecode generated is now run by the Java Virtual Machine and not the processor in consideration.
This essentially means that we only need to have basic java installation on any platforms that we want to run our code on. Resources required to run the bytecode are made available by theJava Virtual Machine, which calls the processor to allocate the required resources. JVM's are stack-based so they stack implementation to read the codes. Platform independence is one of the soul reasons for which James Gosling started the formation of java and it is this implementation of bytecode which helps us to achieve this.
Hence bytecode is a very important component of any java program. The set of instructions for the JVM may differ from system to system but all can interpret the bytecode. A point to keep in mind is that bytecodes are non-runnable codes and rely on the availability of an interpreter to execute and thus the JVM comes into play.
Bytecode is essentially the machine level language which runs on the Java Virtual Machine. Whenever a class is loaded, it gets a stream of bytecode per method of the class. Whenever that method is called during the execution of a program, the bytecode for that method gets invoked. Javac not only compiles the program but also generates the bytecode for the program.
Thus, we have realized that the bytecode implementation makes Java a platform-independent language. Portability ensures that Java can be implemented on a wide array of platforms like desktops, mobile devices, severs and many more.
This is necessary in order for other classes to access them. A stack with the element 'b' on the top and element 'a' just after the top element is denoted 'a,b'.
From Wikibooks, open books for an open world. Category : Book:Java Programming. Namespaces Book Discussion.
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