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Want to know if there is a way to see the output of java lexical and analysis phase while compiling a java program. We can see the byte code(Virtual machine code) using javap. Is there a way to see the output of Lexical and Analysis Phase? Thanks in advance!

karma
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  • You might be able to find a tool that generates an abstract syntax tree. But why do you need this? – Colonel Thirty Two Mar 16 '15 at 14:55
  • I am reading a textbook and there is a question "Show the token classes, or “words”, put out by the lexical analysis phase corresponding to this Java source input: sum = sum + unit ∗ /∗ accumulate sum ∗/ 1.2e-12 ;". The theoretical solution is there in the book, wanted to know if there was any way to find the answer practically. – karma Mar 16 '15 at 14:58
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    It's a lot more work to do it programmatically than to trace back knowing the rules of operator precedence and assocativity. – Makoto Mar 16 '15 at 16:16
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    Getting a real parser right is hard. You want to use a tool that has been through trial-by-fire. For a tool and an example of what Java parsing looks like, see http://stackoverflow.com/questions/6376662/would-would-an-ast-abstract-syntax-tree-for-an-object-oriented-programming-lan/6378997#6378997 – Ira Baxter Mar 16 '15 at 17:15

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If you want to analysis the abstract syntax tree of the java source file. There are some samples:

You can debug the first example and you will find the source java file will be loaded into a Trees object.

chengpohi
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