Re: Obtaining methods signature

Dmitry Marienko <dima@[EMAIL PROTECTED]
> wrote:

>    I'm dumb on simple question. How can I get  method's signature in my 

> java program in "JVM notation" ?
>   For example for class
>    class A {
>       void foo(int a,int b) { ... }
>    }
>   I would like to get  string .../A/foo(II)V  for method 'foo' . I
haven't  
> found any appropriate methods to do it.


I believe that this information is not available in the standard Java
API. Haven't followed late changes though..

To get this info, I'm using the Apache BCEL library
(http://jakarta.apache.org/bcel/):


$ cat SignatureLister.java
import java.io.*;

import org.apache.bcel.*;
import org.apache.bcel.classfile.*;
import org.apache.bcel.generic.*;
import org.apache.bcel.util.*;

public class SignatureLister {
    public static void main(String args[]) throws IOException {
        ClassParser parser  = new ClassParser(args[0]);
        JavaClass   clazz   = parser.parse();
        Method[]    methods = clazz.getMethods();

        for(int i=0; i<methods.length; i++) {
            System.out.print(clazz.getClassName());
            System.out.print(".");
            System.out.print(methods[i].getName());
            System.out.println(methods[i].getSignature());
        }    
    }
}

$ javac -classpath bcel-5.2.jar SignatureLister.java 

$ $ java -cp bcel-5.2.jar:. SignatureLister A.class
A.<init>()V
A.foo(II)V




br,
Pietu