在声明部分使用@SuppressWarnings("unused")注释

Question

我有一个与@SuppressWarnings("unused")注释有关的基本问题.基本上,我想在我的类的声明部分中抑制代码块上未使用的警告.我宁愿不要在整个班级上禁止使用未使用的警告.

目前,我这样做:

public class MyClass {
    //Constants
    private final String ACCEPT = "Yes";
    @SuppressWarnings("unused")
    private final String DENY = "No";            //Not currently used
    private final String TENTATIVE = "Maybe";
    @SuppressWarnings("unused")
    private final String POSTPONE = "Later";     //Not currently used

    //Variables
    private int counter;
    ....

我发现上面的代码有点乱,随机抛出的注释就像那样.我想做的是:

//Constants
@SuppressWarnings("unused")
{
  private final String ACCEPT = "Yes";
  private final String DENY = "No";            //Not currently used
  private final String TENTATIVE = "Maybe";
  private final String POSTPONE = "Later";     //Not currently used
}

//Variables
private int counter;
....

当然,这在Java中是非法的,因为块不能简单地这样做.这不是什么大不了的事,但我很好奇,如果我错过了一个明显而优雅的解决方案.

Answer 1

如果你想要保留所有那些未使用的常量,那么快速而肮脏的技巧就是;

public class MyClass {
//Variables
    private int counter;

@SuppressWarnings("unused")
    private static final class UnusedConstants{
        private final String ACCEPT = "Yes";
        private final String DENY = "No";            
        private final String TENTATIVE = "Maybe";
        private final String POSTPONE = "Later";     
   }
}

而且我会让它们变得静止,但是你的电话.

编辑:或者,我认为更好:

public class MyClass {

    private enum Answer {

        ACCEPT ("Yes"),
        DENY ("No"),
        TENTATIVE("Maybe"),
        POSTPONE("Later");

        private final String answer;

        private Answer(String answer) {
        this.answer = answer;
        }

        public String toString() {
            return answer;
        }
    }
}    

这样,只要您使用至少一个值,就不会获得未使用的警告.