`Pattern.compile()` should not be called in a loopJAVA-P0331
This method calls Pattern.compile() inside a loop with constant arguments. If this Pattern will be used several times, there's no reason to compile it on each loop iteration.
Maps and Sets of URLs can be performance hogsJAVA-S0057
This method or field is or uses a Map or Set of URLs. Since both the equals and hashCode method of URL perform domain name resolution, this can result in a big performance hit.
Inefficient use of `String` constructorJAVA-P0062
Creating a String using object creation wastes memory because the new String object so constructed will be functionally indistinguishable from the String value passed as a parameter. Just use the string directly.
Inefficient use of `toArray` with non-zero sized array argumentJAVA-P0335
This method uses toArray with a non-zero sized array argument. This is less efficient than passing a zero-sized array.
Inefficient use of keySet iterator instead of entrySet iteratorJAVA-S0361
This method accesses the value of a Map entry, using a key that was retrieved from a keySet iterator. It is more efficient to use an iterator on the entrySet of the map, to avoid the Map.get(key) lookup.