code: private static void generateRefresh(String sharedPreferenceName, String className) {
  		MethodSpec.Builder method = MethodSpec.methodBuilder("refresh").addModifiers(Modifier.PUBLIC).addJavadoc("force to refresh values\n").returns(className(className));
  
  		method.addStatement("createPrefs()");
  		method.addStatement("return this");
  		builder.addMethod(method.build());
  	}
docs: Generate refresh.
  
  @param sharedPreferenceName
  the shared preference name
  @param className
  the class name