'Collection.toArray()' call style
Reports Collection.toArray()
calls that are not in the preferred style, and suggests applying the preferred style.
There are two styles to convert a collection to an array:
A pre-sized array, for example,
c.toArray(new String[c.size()])
An empty array, for example,
c.toArray(new String[0])
In older Java versions, using a pre-sized array was recommended, as the reflection call necessary to create an array of proper size was quite slow.
However, since late updates of OpenJDK 6, this call was intrinsified, making the performance of the empty array version the same, and sometimes even better, compared to the pre-sized version. Also, passing a pre-sized array is dangerous for a concurrent or synchronized collection as a data race is possible between the size
and toArray
calls. This may result in extra null
s at the end of the array if the collection was concurrently shrunk during the operation.
- By ID
Can be used to locate inspection in e.g. Qodana configuration files, where you can quickly enable or disable it, or adjust its settings.
ToArrayCallWithZeroLengthArrayArgument
Use the inspection options to select the preferred style.
Here you can find the description of settings available for the 'Collection.toArray()' call style inspection, and the reference of their default values.
Inspection Details | |
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By default bundled with: | |
Can be installed with plugin: | Java, 243.23126 |
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