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String is an Object, so a list of String should be a list of Object, right? Java says no, and for a good reason: if that assignment ...

Inside a generic class, "new T()" looks reasonable but won't compile. By runtime, T is erased, so the JVM has no idea which class ...

"new T[10]" won't compile. Arrays remember and check their element type at runtime, but T is erased, so there's nothing to give the ...

A raw List still compiles, for backwards compatibility. Assign a list of String to it, add the number 42, and all you get is a warning.

A plain T only gives you Object's methods, so calling compareTo won't compile. Bound it — T extends Comparable of T — and the ...

Your class implements Comparable with one compareTo method — the compiled class has two. After erasure the interface wants ...

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Make an ArrayList of String and an ArrayList of Integer, then compare their classes: it prints true. The compiler checks your type ...

Component or @Bean? Your own class with a plain constructor gets @Component, and component scanning finds it. A class you ...

A list of "? super Integer" could be a list of Integer, Number, or Object. Every one of those can hold an Integer, so adding is always ...

Which wildcard goes where? Look at the real signature of Collections.copy: the source list only hands elements out, so it uses ...

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Checking whether an object is a list of String doesn't compile: by runtime, the String part is erased and the JVM only sees a List.

Learn the basics of Java Operators in this beginner-friendly tutorial! In this video, we cover the important types of operators in ...

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Why does Java still matter? In under a minute, this lesson explains where Java came from and why so many people use it. You'll ...

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