与令牌语法有关的未知错误 [英] Unknown error relating to syntax of tokens

问题描述

我无法解决Java中以下代码的错误：

I can't work out what is wrong with the following code in Java:

import java.util.*;

public class stringCalculator {
    String operator_array[] = {"+", "-", "/", "*", "(", ")"};
    Queue<Integer> outputQueue = new LinkedList<Integer>();
    Stack <Object> operatorStack = new Stack<Object>();
    Hashtable<String, String> operatorPrecedence = new Hashtable<String, String>();
    operatorPrecedence.put("+", "2");

我收到以下错误：

令牌上的语法错误，删除这些令牌，这与以下行有关：

Syntax error on tokens, delete these tokens, This is in relation to the following line:

operatorPrecedence.put("+", "2");

感谢任何帮助

推荐答案

您不能将语句直接放在课堂内。

You can not put statements directly inside a class.

创建一个方法或构造函数，并将调用放在将在那里。

Create a method or a constructor and put the call to put there.

public stringCalculator() {
    operatorPrecedence.put("+", "2");
}

此外，使用大写名称是很好的做法，如 StringCalculator 。

Also, it is good practice to use an upper-case name for the class, like StringCalculator.

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