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plurals

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Id
6607641
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2011-07-07T08:12:35.973
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2011-07-07T08:12:35.973
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Score
111
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LastEditorDisplayName
text
Body
<code><T></code> is a generic and can usually be read as "of type T". It depends on the type to the left of the <> what it actually means. I don't know what a <code>Pool</code> or <code>PoolFactory</code> is, but you also mention <code>ArrayList<T></code>, which is a standard Java class, so I'll talk to that. Usually, you won't see "T" in there, you'll see another type. So if you see <code>ArrayList<Integer></code> for example, that means "An <code>ArrayList</code> of <code>Integer</code>s." Many classes use generics to constrain the type of the elements in a container, for example. Another example is <code>HashMap<String, Integer></code>, which means "a map with <code>String</code> keys and <code>Integer</code> values." Your Pool example is a bit different, because there you are defining a class. So in that case, you are creating a class that somebody else could instantiate with a particular type in place of T. For example, I could create an object of type <code>Pool<String></code> using your class definition. That would mean two things: <ul> <li>My <code>Pool<String></code> would have an interface <code>PoolFactory<String></code> with a <code>createObject</code> method that returns <code>String</code>s.</li> <li>Internally, the <code>Pool<String></code> would contain an <code>ArrayList</code> of Strings.</li> </ul> This is great news, because at another time, I could come along and create a <code>Pool<Integer></code> which would use the same code, but have <code>Integer</code> wherever you see <code>T</code> in the source.
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1. POWhat does <T> (angle brackets) mean in Java?
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1. USmgiuca
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