You appear to be expecting to be able to reference constants from KeyEvent without either importing them or qualifying them. You should either have: row1.add(createButton(KeyEvent.VK_DEAD_TILDE, "~")); Or add: import static... more 10/30/2015 3:18:59 PM

There's AtomicReference<T> which is what I'd normally use. final AtomicReference<String> ref = new AtomicReference<String>(); final Runnable runnable = new Runnable() { public void run() { ref.set("Hello... more 10/30/2015 2:14:47 PM

If a Stream returns true from CanSeek, it assumed that Length, SetLength, Position and Seek are all supported. Some code may test CanSeek and use the result to optimize its behaviour - as seems to be the case here. When you return true... more 10/29/2015 8:30:29 PM

(Answered before the .NET 2.0 requirement was mentioned - it may still be useful for others.) You can use a Dictionary<string, dynamic> instead - at which point the compile-time type of the expression dict["stringObject"] will be... more 10/29/2015 11:57:21 AM

You're converting the String to a BigDecimal with no problems. The BigDecimal value has no notion of whether the value has exponential notation or not... it's just a scaled value. The problem you're seeing is when you implicitly call... more 10/29/2015 11:42:04 AM

You can use javap (with -v for verbose mode), and specify any class from the jar file. For example, looking at a Joda Time jar file: javap -cp joda-time-2.7.jar -v org.joda.time.LocalDate Here the -cp argument specifies the jar file to... more 10/28/2015 4:13:17 PM

Most types in Joda Time (at least the ones you should use) are immutable. You can't change their value - but you can call methods which return a new value. You're calling the right method in this case, but you need to remember the result,... more 10/26/2015 8:48:26 PM

The compiler doesn't consider a != 0 and a == 0 to be mutually exclusive conditions - or rather, it doesn't look at whether two if conditions are mutually exclusive to work out what happens. So you can fix the error by changing your code... more 10/26/2015 8:42:27 PM

In ShoppingCart class, there's private LinqValueCalculator calc; from my understanding we are creating an object from that class No, it doesn't. It declares a variable of that type, but it doesn't create any objects. Initially, that... more 10/24/2015 11:16:14 AM

Firstly, you would have fewer problems if you followed Java naming conventions - currently Catalog is both an array variable name and a type name. Secondly, there is no add method in arrays. You may want a List, e.g. ArrayList.... more 10/24/2015 3:36:52 AM