gotos and JVM instructions

[yangyuex]

Dear Sir

I am sorry to trouble you.
I am a student. My problem is like this:

Because I want to use a graph package from others (No source codes),
unfortunately, its GraphObject.class
never implements "Serializable" interface. But I want to transfer graph
object between
different JVMs. So, I try to decompile all its classes using jad. It
works fine for all other
classes. But for "isTree()" method of Net.class,  jad generated some
"goto" and JVM codes.
So, I cannot compile these generated codes by javac. Could you help me
have a look?

Furthermore, I still worry one problem:

Because all classes of this package is subclass of GraphObject class, I
try to decompile
GraphObject.class to GraphObject.java, then add "implements
Serializable" to this GraphObject.java.
Next, I decompile all its classes files to .java files. The last step is
to compile these .java files to
.class files (include GraphObject.java). Do you think this method is
correct? I am not sure
how java compiler does when it compile .java files if they have
inherentance relationship.

Thanks very much!
yangyuexiang


    public boolean isTree()
    {
        boolean flag;
        String s;
        Enumeration enumeration;
        flag = true;
        if(this instanceof Tree)
            return true;
        s = defUniqueSystemKey(null, false);
        enumeration = enumerateVertices();
          goto _L1
_L4:
        Vertex vertex = (Vertex)enumeration.nextElement();
          goto _L2
        JVM INSTR pop ;
        continue; /* Loop/switch isn't completed */
_L2:
        if(vertex.systemdict.getBoolean(s) || _isTreeBranch(vertex, s))
            continue; /* Loop/switch isn't completed */
        flag = false;
        break; /* Loop/switch isn't completed */
_L1:
        if(enumeration.hasMoreElements()) goto _L4; else goto _L3
_L3:
        undefSystemKey(s);

        return flag;
    }