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Array versus List: When to use which?
... such optimizations tend to be highly local and not expose the mutation to API consumers.
– Eamon Nerbonne
Jul 18 '14 at 12:38
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IllegalMonitorStateException on wait() call
...any method other than wait, yes you'd never get to notify. However, in the API docs for Object.wait, "The thread releases ownership of this monitor". So whilst in wait it's as if it is outside of the enclosing synchronized blocks (for the same object, may be multiple synchronized blocks on the same ...
Java URL encoding of query string parameters
... in short URLEncoder is for encoding for form submission. It is not for escaping. Its not the exact same escaping that you would use to create URLs to be put in your web page but happens to be similar enough that people abuse it. The only time you should be using URLEncoder is if your writing a HTTP...
Android Preferences: How to load the default values when the user hasn't used the preferences-screen
... is created
Take a look into PreferenceManager.setDefaultValues in Android API for further investigation.
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To prevent a memory leak, the JDBC Driver has been forcibly unregistered
...hich auto-registers itself during webapp's startup using the ServiceLoader API, but which did not auto-deregister itself during webapp's shutdown. This message is purely informal, Tomcat has already taken the memory leak prevention action accordingly.
What can you do?
Ignore those warnings. Tomca...
How to use the toString method in Java?
... approach for getting the job done, given you keep using the default Swing API. If you want custom rendering, fine, install a custom renderer on your component. If you just want to display an object represented by a String, then implementing toString() is way easier compared to a custom renderer, wh...
WaitAll vs WhenAll
...eption behaviour contradict the docs here (docs.microsoft.com/en-us/dotnet/api/…) "If any of the supplied tasks completes in a faulted state, the returned task will also complete in a Faulted state, where its exceptions will contain the aggregation of the set of unwrapped exceptions from each of ...
When to use cla(), clf() or close() for clearing a plot in matplotlib?
...palling that figures are never garbage collected under the standard pyplot API.
– Cecil Curry
Jan 4 '16 at 3:25
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Best way to convert an ArrayList to a string
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Requires Android API 26+
– Arsen Sench
Aug 28 '17 at 8:24
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Java Class.cast() vs. cast operator
...ame to java I personally like using Class#cast with the collections/stream API if I'm working with abstract types, for example.
Dog findMyDog(String name, Breed breed) {
return lostAnimals.stream()
.filter(Dog.class::isInstance)
.map(Dog.class::cast)
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