StackOverflow2013

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plurals

PO
primarykey
Id
5684761
data
AcceptedAnswerId
0
AnswerCount
0
ClosedDate
CommentCount
3
CommunityOwnedDate
CreationDate
2011-04-16T05:51:12.077
FavoriteCount
0
LastActivityDate
2017-08-07T11:37:59.033
LastEditDate
2017-08-07T11:37:59.033
LastEditorUserId
306730
OwnerUserId
306730
ParentId
3437897
PostTypeId
2
Score
78
ViewCount
0
LastEditorDisplayName
text
Body
There is a small loophole however: if you define your <code>Foo</code> class as abstract. That would mean you have to instantiate you class as: <pre><code>Foo<MyType> myFoo = new Foo<MyType>(){}; </code></pre> (Note the double braces at the end.) Now you can retrieve the type of <code>T</code> at runtime: <pre><code>Type mySuperclass = myFoo.getClass().getGenericSuperclass(); Type tType = ((ParameterizedType)mySuperclass).getActualTypeArguments()[0]; </code></pre> Note however that <code>mySuperclass</code> has to be the superclass of the class definition actually defining the final type for <code>T</code>. It is also not very elegant, but you have to decide whether you prefer <code>new Foo<MyType>(){}</code> or <code>new Foo<MyType>(MyType.class);</code> in your code. <hr> For example: <pre><code>import java.lang.reflect.ParameterizedType; import java.lang.reflect.Type; import java.util.ArrayDeque; import java.util.Deque; import java.util.NoSuchElementException; /** * Captures and silently ignores stack exceptions upon popping. */ public abstract class SilentStack<E> extends ArrayDeque<E> { public E pop() { try { return super.pop(); } catch( NoSuchElementException nsee ) { return create(); } } public E create() { try { Type sooper = getClass().getGenericSuperclass(); Type t = ((ParameterizedType)sooper).getActualTypeArguments()[ 0 ]; return (E)(Class.forName( t.toString() ).newInstance()); } catch( Exception e ) { return null; } } } </code></pre> Then: <pre><code>public class Main { // Note the braces... private Deque<String> stack = new SilentStack<String>(){}; public static void main( String args[] ) { // Returns a new instance of String. String s = stack.pop(); System.out.printf( "s = '%s'\n", s ); } } </code></pre>
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1. This table or related slice is empty.
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1. POHow to get a class instance of generics type T
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1. PTAnswer
UserLastEditorUserId
1. USbert bruynooghe
UserOwnerUserId
1. USbert bruynooghe
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