Small problem with generics

Hi,
I'd like to get my generic (Hash)Map back from a textfile, for this I have written a method that reads the file and returns an Object. The only problem I have is that I get the error "java uses unchecked or unsafe operations , ..." with the following code:
Map<Character, TransVal> thisIsMyMap = (HashMap<Character, TransVal>) readFromFile("filename.dat");I thought it would be the same as parsing a String (guess not :-) ):
String s = (String) justAnObject;TransVal is a class that contains a BitSet and an Integer.
Any help plz?
(btw sorry for my english :-s )

The reason is that it cannot check, at runtime or at compile time whether or not the cast is valid. It will at runtime check the cast to HashMap (btw, use Map for both the cast and the variable), but it will not check that all the keys are Characters and that all the values are TransVals. What will happen is that somewhere where you actually use the map, if the assumption you are making here is incorrect, there will be a ClassCastException in what appears to be perfectly safe code. If you are positive that your cast is safe, either change the return type of readFromFile or put a @SuppressWarnings("unchecked") annotation on the method and use a java compiler that respects it (eclipse, 1.6, and maybe others, but not sun's 1.5 javac).

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Hi,
I've just started using generics and I've been able to solve most of my problems with type declarations etc, but I still have a few problems left.
My current problem is in a class which has a map of classes which implements a generic typed interface (The interface is called Persister in the code below).
The map is declared as:
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It's probably hard to understand what I mean (since I don't know the terminology) so here's a complete minimal example which illlustrates the problem. The problem is in the selectAll method in the DbFacade class.
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Thanks in advance
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///////////////// Start of complete example
import java.util.*;
class ClientSample {
 public static void main(String[] args) {
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Well you can put in a type cast
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Spec.java:4: <identifier> expected
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It worked!
I don't know why that didn't work in Eclipse, so:
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public static void main(String[] args)
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 Impl i = im.getMe();
 Spec s = i.getMe();
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 System.out.println("i = "+i);
 System.out.println("s = "+s);
 System.out.println("b = "+b);
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When I upload images from my camera, I have a few problems.
When Image Capture automatically opens, there are two different windows, and I never know which one will open. One has choices like Delete and Eject camera. The other window only has choices like Rotate Right and Rotate Left. Is there a way to get the one with more choices to open every time?
When I eject the camera (either by using the choice from the one window) or by quitting Image Capture and dragging the camera icon in the Trash, I seem to always get a Device Removal warning when I shut off the camera.
Thanks,
Allan

The second problem may be cured by using 'reformat' of the memory card, in the camera.
There may be some corruption in the flash memory; or it may be failing.
The first issue, may be relieved if you can find the correct file plists for Image Capture; and
trash those preferences. If the actual application is somehow damaged, it may be possible
to re-install just that application through use of Pacifist (charlessoft, download) to extract
just that item, from the computer's OS X install/restore disc. Without an 'archive & install.'
Hopefully someone will have exact details from experience; since I've not had similar issues.
Usually, I'd use a free image editor such as ToyViewer for Mac; and also Preview, to edit.
Good luck & happy computing!

Small problem with the Nano 6G, and run workouts

Hello! I have sensor Nike IPod Sport Kit, which is in the new Nano 6G is not needed, because the accelerometer (pedometer) is built into the player and is suitable for running. But buying a heart rate monitor transmitter i is upset that it should only be used with the sensor in the shoe. Because when I connect the transmitter Nike to player Nano 6G, and then connected transmitter heart rate monitor and want to start training, the player Nano 6G is looking sensor in the sneaker, although it could well do without him. Request to developers Apple fix this problem so that you can use the transmitter heart rate monitor with built-in accelerometer in the player Nano 6G.
Sorry for the google-translator. Regards, Alex.

Alex, exactly what I was looking for...
I tryed to get info from Apple and Nike support but seems nobody knows what I'm tolking about.
I hope Apple will fix it on 6th G even if they'll launch the 7th G.
Max

Small problem with generics

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