< identifier>当试图调用一个类时 [英] <identifier> expected when trying to call a class

问题描述

>

获得预期的错误标识符。我仍然在学习如何调用类，我相信我做错了。

I keep on getting the error identifier expected. I am still learning how to call classes and I believe I am doing it wrong.

推荐答案

问题是，有一个 OptionFrame 的构造函数 - 记住构造函数的格式是一个标识符，然后是类名，然后是括号中的任何参数（并且没有指定返回类型。示例可能是：

The issue is that you don't have a constructor for OptionFrame -- remember that the format of a constructor is an identifier, then the class name, then any arguments in parentheses (and no return type specified. So an example might be:

public OptionFrame() {
   ...
}

请记住，类中的语句总是分为三个类别 - 实例变量，构造函数和方法 - 对于任何不适合其中之一的错误语句，例如未包含在方法或构造函数中的打印语句。

Just remember that statements in classes are always grouped into three categories -- instance variables, constructors, and methods -- and watch out for any stray statements that don't fit into one of those, for example a print statement not embodied within a method or constructor.

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