text analysis - Retrieve code executed by function in Java -

i'm trying analyse bits of java-code, looking if code written complexly. start string containing contents of java-class. there want retrieve, given function-name, "inner code" function. in example:

public class testclass{     public int testfunction(char x) throws exception{         if(x=='a'){             return 1;         }else if(x=='{'){             return 2;         }else{             return 3;         }     }     public int testfunctiontwo(int y){         return y;     } } 

i want get, when call string code = getcode("testfunction");, code contains if(x=='a'){ ... return 3; }. i've made input code ugly, demonstrate of problems 1 might encounter when doing character-by-character-analysis (because of else if, curly brackets no longer match, because of exception thrown, function declaration not of form functionname{ //contents }, etc.)

is there solid way contents of testfunction, or should implement problems described manually?

you need java parser. worked qdox. easy use. example here:

import com.thoughtworks.qdox.javaprojectbuilder; import com.thoughtworks.qdox.model.javaclass; import com.thoughtworks.qdox.model.javamethod;  import java.io.file; import java.io.ioexception;  public class parser {      public void parsefile() throws ioexception {         file file = new file("/path/to/testclass.java");          javaprojectbuilder builder = new javaprojectbuilder();         builder.addsource(file);          (javaclass javaclass : builder.getclasses()) {             if (javaclass.getname().equals("testclass")) {                 (javamethod javamethod : javaclass.getmethods()) {                     if (javamethod.getname().equals("testmethod")) {                         system.out.println(javamethod.getsourcecode());                     }                 }             }         }     } }