Clever Geek Handbook

Unable to understand the use of Java templates?

Suppose I have the following piece of code

Number n=new Integer(2);

then when i use the code it shows an error

Class<Number> hi=n.getClass(); //type mismatch error

but if the code below works fine

Class<? extends Number> hi=n.getClass();

Why is that? Please explain in a few simple and precise words.

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1 answer


Well, the class Integer

is equal Class<Integer>

, which is different from Class<Number>

. Since it n

can contain any type Number

, its class can be any class that extends Number

.



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