code: public String getDescriptor() {
              StringBuilder stringBuilder = new StringBuilder().append('(');
              for (TypeDescription parameterType : parameterTypes) {
                  stringBuilder.append(parameterType.getDescriptor());
              }
              return stringBuilder.append(')').append(returnType.getDescriptor()).toString();
          }
docs: Returns the method descriptor of this method handle representation.
  
  @return The method descriptor of this method handle representation.