Taming Tiger

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Tutorial: Taming Tiger

Taming Tiger, Part 2 Understanding generics Welcome to the second part of this three-part series on Sun Microsystems' latest release of the Java 2 Platform, Standard Edition (J2SE). To refresh your memory, Part 1 was a quick introduction to J2SE 1.5

Tutorial Details:

Enter Java generics
Now, let's rewrite the above code fragment using generics:

// Class A and B declared previously

// Somewhere in the program create a Vector
Vector v = new Vector ();

// Add an object of type A
v.add(new A());

// And sometime later get the object back
B b = (B) v.get(0);

That looks similar to the first fragment, except for the code in the angle brackets. The angle brackets are the syntax for providing type parameters to parameterized types. I talk more about both parameterized types and type parameters in this article's later sections.

Even though the code change is minimal, its impact is far from small. This code fragment will not compile. Compiling this program with J2SE 1.5 (remember to use -source 1.5) will give you the following error:

inconvertible types
found : A
required: B
B b = (B) v.get(0);

In plain English, the compiler tells us that to be able to use the line B b = (B) v.get(0); legally, the vector must be parameterized (in the declaration) to accept objects of type B.

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