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JDK 1.5 introduces several extensions to the Java programming language. One of these is the introduction of generics. This tutorial is aimed at introducing you to generics. You may be familiar with similar constructs from other languages, most notably C++ templates. If so, you’ll soon see that there are both similarities and important differences. If you are not familiar with look-a-alike constructs from elsewhere, all the better; you can start afresh, without unlearning any misconceptions.

The Java compiler will prevent this from happening of course. Line 2 will cause a compile time error. In general, if Foo is a subtype (subclass or subinterface) of Bar, and G is some generic type declaration, it is not the case that G is a subtype of G. This is probably the hardest thing you need to learn about generics, because it goes against our deeply held intuitions. The problem with that intuition is that it assumes that collections don’t change. Our instinct takes these things to be immutable.

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