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            Written: Maryna Pylnyk, 18/03/2017     

James Gosling, Mike Sheridan, and Patrick Naughton initiated the Java language project in June 1991. Did you know that Java language was initially called Oak after an oak tree that stood outside Gosling's office.

Which of these structures accepts null as a key?

Which one of the following interfaces has method ?

int result1 = 1000 % 60;
int result2 = 100 % 60;
System.out.println(result1+" / " +result2);

What is the output?

We have these statements:

String a = "Core";
String b = "Core";
String c = new String("Core");
String d = new String("Core");
    (a == b)+"-"+
    (c == d)+"-"+

Which of the following is a valid output?

public void getValue() {
    String value = new String("pippo");
    String newValue = value.replace('p','b');
  return newValue;

What is the result of this method?


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