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why protected modifier is not allowed?

 
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In the following code, there is an error on line 11 saying "modifier protected not allowed here". what is the reason?
 
Greenhorn
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You cannot use the protected access modifier for top level classes.
The protected modifier means that the member can only be accessed within its own package or by a subclass of its class in another package.

At top level you can only use the public modifier or no modifier (package-private).

 
Greenhorn
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Only modifiers that applicable for Outer classes are public

<default>

abstract

final

strictfp
 
Anjali Vaidya
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Can you make a subclass protected if it is extending a public class? I think no, because it is restricting the access
Then when exactly can we use protected?
 
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You can never make a top level class protected. It makes no sense, it doesn't mean anything.
 
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