code: public final SgMethod findMethodByName(final String name) {
          if (name == null) {
              throw new IllegalArgumentException("The argument 'name' cannot be null!");
          }
          for (int i = 0; i < methods.size(); i++) {
              final SgMethod method = methods.get(i);
              if (method.getName().equals(name)) {
                  return method;
              }
          }
          return null;
      }
docs: Find a method by it's name.
  
  @param name
  Name of the method to find - Cannot be null.
  
  @return Method or null if it's not found.