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In Java, when should I create a checked exception, and when should it be a runtime exception? [dupli
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In general, I think the advice by Joshua Bloch in Effective Java best summarises the answer to your question: Use checked expections for recoverable conditions and runtime exceptions for programming errors (Item 58 in 2nd edition).
So in this case, if you really want to use exceptio...
How to make Eclipse behave well in the Windows 7 taskbar?
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Specify the latest available Java VM in your eclipse.ini. I.e.:
-vm
jdk1.6.0_10\jre\bin\client\jvm.dll
Make sure they are on separate lines
Anything after the "vmargs" is taken to be vm arguments
(More info)
Or alternatively add the java bin folde...
final keyword in method parameters [duplicate]
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Java always makes a copy of parameters before sending them to methods. This means the final doesn't mean any difference for the calling code. This only means that inside the method the variables can not be reassigned. (note t...
How to avoid the need to specify the WSDL location in a CXF or JAX-WS generated webservice client?
When I generate a webservice client using wsdl2java from CXF (which generates something similar to wsimport), via maven, my services starts with codes like this:
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Create a File object in memory from a string in Java
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A File object in Java is a representation of a path to a directory or file, not the file itself. You don't need to have write access to the filesystem to create a File object, you only need it if you intend to actually write to the file (usi...
Is a Java hashmap search really O(1)?
I've seen some interesting claims on SO re Java hashmaps and their O(1) lookup time. Can someone explain why this is so? Unless these hashmaps are vastly different from any of the hashing algorithms I was bought up on, there must always exist a dataset that contains collisions.
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How to convert nanoseconds to seconds using the TimeUnit enum?
...g - convert() and the toFoo() methods all return longs now docs.oracle.com/javase/6/docs/api/java/util/concurrent/…
– Riking
Jul 30 '13 at 1:58
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Java Array Sort descending?
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Java 8:
Arrays.sort(list, comparator.reversed());
Update:
reversed() reverses the specified comparator. Usually, comparators order ascending, so this changes the order to descending.
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Catching java.lang.OutOfMemoryError?
Documentation for java.lang.Error says:
14 Answers
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What is the easiest/best/most correct way to iterate through the characters of a string in Java?
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@Matthias You can use the Javap class disassembler to see that the repeated calls to s.length() in for loop termination expression are indeed avoided. Note that in the code OP posted the call to s.length() is in the initialization expression, so the l...