Java OCA OCP Practice Question 2691

Question

Which of the answer choices are valid given the following declaration? 

Map<String, Double> map = new HashMap<>();
  • A. map.add("pi", 3.14159);
  • B. map.add("e", 2L);
  • C. map.add("log(1)", new Double(0.0));
  • D. map.add('x', new Double(123.4));
  • E. None of the above


E.

Note

Trick question! The Map interface uses put() rather than add() to add elements to the map.

If these examples used put(), the answer would be A and C.

B is no good because a long cannot be shoved into a Double.

D is no good because a char is not the same thing as a String.




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