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public void handlePrinting(String text) { | |
try { | |
printText(text); | |
} catch (PrintingException e) { | |
// handle the exception and decide what to do | |
// retry or show an error message and ... | |
return; | |
} | |
// successful printing and ... | |
} |
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public synchronized void printText(String text) throws PrintingException { | |
PrintingListener printingListener = new PrintingListener() { | |
@Override | |
public void onSuccess(SuccessResult successResult) { | |
} | |
@Override | |
public void onFailure(FailureResult failureResult) { | |
} |
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public synchronized void printText(String text) throws PrintingException { | |
// communication with printer using API here | |
} |
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getIntOr0 :: Maybe Int -> Int | |
getIntOr0 = fromMaybe 0 |
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fromMaybe :: a -> Maybe a -> a |
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import Data.List | |
import Data.Ord | |
main :: IO () | |
main = print $ desort [2,8,7,10,1,9,5,3,4,6] | |
desort :: [Integer] -> [Integer] | |
desort = reverse . sort -- better use: sortOn Data.Ord.Down |
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isPow2Even :: Integer -> Bool | |
isPow2Even = even . pow2 --instead of: even $ pow2 a |
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isPow2Even :: Integer -> Bool | |
isPow2Even a = even $ pow2 a --or even (pow2 a) |
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main :: IO () | |
main = print (pow2 3) -- or print $ pow2 3 |
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pow2 :: Integer -> Integer | |
pow2 a = a * a |