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  • How to call getClass() from a static method in Java?

    刚才在学习Java 使用properties类,遇到这样的错误:

    Cannot make a static reference to the non-static method getClass() from the type Object

    以前使用过getClass,不晓得怎么用的,后来在stackoverflow看到同样的问题

    I have a class that must have some static methods. Inside these static methods I need to call the method getClass() to make the following call:

    publicstaticvoid startMusic()
    {
      URL songPath=getClass().getClassLoader().getResource("background.midi");
    }

    However Eclipse tells me:

    Cannot make a static reference to the non-static method getClass() 
    from the type Object

    What is the appropriate way to fix this compile time error?

    牛人的回答是这样的:

    s for the code example in the question, the standard solution is to reference the class explicitly by its name, and it is even possible to do without getClassLoader() call:

    classMyClass{
           publicstaticvoid startMusic()
        {
                  URL songPath =MyClass.class.getResource("background.midi");
         }
    }
    

      

    This approach still has a back side that it is not very safe against copy/paste errors in case you need to replicate this code to a number of similar classes.

    And as for the exact question in the headline, there is a trick posted in the adjacent thread:

    Class currentClass =newObject(){}.getClass().getEnclosingClass();
     

    It uses a nested anonymous Object subclass to get hold of the execution context. This trick has a benefit of being copy/paste safe...

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  • 原文地址:https://www.cnblogs.com/tobecrazy/p/3405654.html
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