code: public ConstantInterfaceMethodInfo addConstantInterfaceMethod
          (String className,
           String methodName,
           TypeDesc ret,
           TypeDesc[] params) {
          
          MethodDesc md = MethodDesc.forArguments(ret, params);
          
          return ConstantInterfaceMethodInfo.make
              (this,
               ConstantClassInfo.make(this, className),
               ConstantNameAndTypeInfo.make(this, methodName, md));
      }
docs: Get or create a constant from the constant pool representing an
  interface method in any interface.