How compiler interprets java keywords

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I want to know How compiler interprets java keywords, ex throw and throws

Posted 31-Oct-14 2:28am

Satyarmca

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Mehdi Gholam 31-Oct-14 9:23am

You have to read about compiler theory and abstract syntax trees which is not a topic that can be covered here.

Richard MacCutchan 31-Oct-14 13:01pm

It reads them, compares them with entries in a table, and takes actions according to the information in the table. However, this question is not really easy to answer in a Quick Answers forum.

Sergey Alexandrovich Kryukov 31-Oct-14 13:27pm

Do you want some of us to write a whole book on this topic? This is not a suitable question for Quick Questions & Answers. You can read on the theory of compilers, about scanners, analyzers, optimizers, code generators, etc. Or you can dig into some open-source Java implementation, but you will also need to learn how JVM works, JIT-compilation...
—SA

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Sergey Alexandrovich Kryukov · Answer 1 · 2014-10-31T07:34:00

Please see my comment to the question, other comments. It's not feasible to answer this question in any practically sensible way.

However, I can formally work around the situation. From that standpoint, the answer is: the Java compiler does not really "interpret" those words. After scanning and parsing (optimization, etc), it merely compiles the code to Java bytecode, pretty formally. A compiler does not "know" the semantic of the code. Compiled Java source code is not a machine code, it is a cross-platform bytecode. Next step is done by a JIT compiler:
http://en.wikipedia.org/wiki/Java_bytecode[^],
http://en.wikipedia.org/wiki/Just-in-time_compilation[^].

See also: http://en.wikipedia.org/wiki/Bytecode[^].

-SA

User 11060979 · Answer 2 · 2014-10-31T07:54:00

Before trying to go for compiler I suggest first to try to understand parsers. When understanding parser at least you know what syntax is and what semantic is. After you understand these twos a hard way is in front of you to compile e.g. the parser tree down to machine language.
e.g. Mr. Niklaus Wirth has published a lot about this topic (yes, very old but also lot of very basics, which are still valid). He was one of the "inventor" for data hiding, which for my Point of view is one of the Basics for oop.

http://en.wikipedia.org/wiki/Niklaus_Wirth[^]

One of my favorites for straight Forward parsing: A Calculation Engine for .NET[^]

How compiler interprets java keywords

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