Java中2位运算符的幂？
我有一个 int 变量来保存选项，它可能不包含一个或多个子选项，如下所示：
public static final int OPERATOR_PLUS = 1;
public static final int OPERATOR_SUBTRACT = 2;
public static final int OPERATOR_MULTIPLY = 4;
public static final int OPERATOR_DIVIDE = 8;
我需要一个函数，如果该变体包含子选项，它将返回。我尝试过：
return (Operator & Operators);
return (Operator && Operators);
但是Eclipse说它们都是语法错误（Operator和Operators都是int）。请告诉我如何在 Java 中使用 AND 位运算符。在 .NET 中，我使用：运算符和运算符。
谢谢。
I have a int variable to save the option, that may include none, one or many sub-options like this:
public static final int OPERATOR_PLUS = 1;
public static final int OPERATOR_SUBTRACT = 2;
public static final int OPERATOR_MULTIPLY = 4;
public static final int OPERATOR_DIVIDE = 8;
And I need a function that will return if that variant contains a sub-option. I tried:
return (Operator & Operators);
return (Operator && Operators);
But Eclipse says both of them are grammar errors (both Operator and Operators are int). Please tell me how to use AND Bit operator in Java. In .NET, I use: Operator And Operators.
Thanks.
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Java 不会将
int视为boolean（与 C++、AFAIU 不同）。尝试Java won't treat an
intas aboolean(unlike C++, AFAIU). Try你的方法的返回类型是什么？如果是
boolean，那么你应该这样写：What is the return type of your method? If it is
boolean, then you should write it like this:第一个是按位 AND 运算符，只要方法的返回类型是 int 或等效类型，就应该是有效的语法。如果您想要布尔返回类型，则需要执行类似
return (operator &operators) != 0;的操作。第二个无效；它是一个逻辑 AND 运算符，因此它的两个参数都必须是布尔值。
The first one is the bitwise AND operator, and should be valid syntax, so long as the return type of your method is
int, or something equivalent. If you want a boolean return type, you'll need to do something likereturn (operator & operators) != 0;.The second one is not valid; it's a logical AND operator, so both of its arguments need to be
boolean.您需要使用按位 AND 将变量与相关运算符进行比较，看看它是否等于该运算符。
例如，
返回 OPERATOR_PLUS &运算符 == OPERATOR_PLUS;
因为如果您考虑按位的工作原理，您会想说我的变量是否包含运算符的位标志。
You need to compare your variable with the operator in question using bitwise AND to see if that is equivalent to the operator.
Eg,
return OPERATOR_PLUS & operators == OPERATOR_PLUS;
Because if you think about how bitwise works, you want to say does my variable contain the bit flag for the operator.
第一行检查是正确的，而您一次只能检查一个运算符的可能性。此外，您还必须检查结果是否不等于 0 才正确。
The first line would be correct to check that, whereas you can only check one operator possibility at a time. Furthermore you have to check whether the result is not equal to 0 to be correct.
教程以便更好地理解。
Tutorials for better understanding.