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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