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            Written: Maryna Pylnyk, 18/03/2017     

Did you know that one of the difference between HashMap and Hashtable consists in synchronization:
HashMap is non synchronized, Hashtable is synchronized.
We can make the HashMap as synchronized by calling this code:
Map m = Collections.synchronizedMap(hashMap);

String text1 =
    "Questa stringa e metodo replaceFirst";
String text2 = text1.replaceFirst("st","ST");

Select the correct result :

Which one of these structures is faster?

Which one of these statements is correct?

What does it happen with this code?

Which one of the following interfaces has method ?


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