How to read the fully qualified name of a .class file

Question

Hey, I think the title sums it, but still.

I need to extract the fully qualified name of an object from its compiled .class file, could anyone point me in the right direction?

Thanks,
Adam.

Answer 1

public String getFullClassName(String classFileName) throws IOException {           
        File file = new File(classFileName);

        FileChannel roChannel = new RandomAccessFile(file, "r").getChannel(); 
        ByteBuffer bb = roChannel.map(FileChannel.MapMode.READ_ONLY, 0, (int)roChannel.size());         

        Class<?> clazz = defineClass((String)null, bb, (ProtectionDomain)null);
        return clazz.getName();
    }

Answer 2

getClass().getName()

Update: You can load the class-file into a byte[] (using standard i/o) and then use getClass().getClassLoader().defineClass(...)

Answer 3

Use a library like BCEL to read the classfile into memory and query it for the class name.