unchecked « cast « Java Data Type Q&A

1. Unchecked cast problem    stackoverflow.com

Hey, I'm trying to implement the ShellSort algorithm and now I got a problem: warning: [unchecked] unchecked cast
found : java.util.Vector
required: java.util.Vector<java.lang.Object>
Vector<Object> vcur = (Vector<Object>)currentCols[tcur];
Same with vtmp. I don't know where the ...

2. Unchecked cast in Java when casting to list of superclasses    stackoverflow.com

In my Java program, I need to cast an object of type List<? extends SomeBaseClass> to List<SomeBaseClass>. If I cast it directly the compiler complains (shows a warning) that there is ...

3. How do I annotate with @SuppressWarnings("unchecked") for a single cast instead of a whole method?    stackoverflow.com

It seems excessive when annotations apply to a method. How do I use the annotation @SuppressWarnings("unchecked") for a single cast instead of a whole method? In this example, I just finished checking that ...

4. Why is this an unchecked cast?    coderanch.com

Unchecked cast means 'although this cast is vaild, and no ClassCastException is thrown here, other point would throw ClassCastException involving using this object'. For example: public void func1() { Vector svec=new Vector(); svec.add("String"); System.out.println(func2(svec)); } public int func2(Object vec) { Vector ivec=(Vector ) vec; // unchecked cast warning at compile time Integer i=ivec.get(0); // ClassCastException thrown at runtime return i.intValue(); } ...

5. Unchecked cast    coderanch.com

Hi vijay, this error occurs when you try to cast an Object reference variable to some other type like this Set. Because of polymorphism a reference to Object could also be a reference to any other object because all classes implicitly are derived from Object. Therefore the compiler complains and you as a programmer have to confirm that you know what ...

6. unchecked cast with bounded wildcards (although the source expression already has the right bound)    coderanch.com

The following code has an unchecked warnings that i don't understand. I solved it with a wildcard capture method, but i would like to know why that is needed. import java.util.ArrayList; import java.util.List; public class CastTest { static class XList extends ArrayList { private static final long serialVersionUID = 1; } @SuppressWarnings("unused") static void castTest() { List list0 ...

7. Generifying a class - unchecked cast    coderanch.com

Hi, yet another generics question (didn't find something similar to this in the search). I have some classes which share a common pattern but make use of specific types. It appears they would be a good candidate for generifying. So far I have created a new abstract generic base class which should take most of the functionality of each current class. ...

8. unchecked cast *sigh*    forums.oracle.com

9. Cast is reported as unchecked, don't understand why    forums.oracle.com

Now I am not understanding why this is unchecked for the following reasons: getModel() statically returns an IModel, so the type argument of IModel is statically known. At runtime, the cast ensures that the object is an instance of SimpleDomainModelAdapter, and thus implements IModel. Due to the declaration of SimpleDomainModelAdapter, its second type argument must be equal to the type argument ...

10. Unchecked Cast Problem    forums.oracle.com

jack0348 wrote: ... I just curious would it be possible for letting the neg to return NType? Not as you have it now. You are storing NType's in your array, so you can't just store any subclass of Number in it. Look at it like this. You have a Mamal (this is your Number class) class and two classes that extend ...