Java OCA OCP Practice Question 313

Question

Which statement is true about the following code fragment? 

 1. int j = 2; //from   w  w  w  .  j av a 2s  . c om
 2. switch (j) { 
 3.   case 2: 
 4.     System.out.println("value is two"); 
 5.   case 2 + 1: 
 6.     System.out.println("value is three"); 
 7.     break; 
 8.   default: 
 9.     System.out.println("value is " + j); 
10.     break; 
11. }
  • A. The code is illegal because of the expression at line 5.
  • B. The acceptable types for the variable j, as the argument to the switch() construct, could be any of byte, short, int, or long.
  • C. The output would be the text value is two.
  • D. The output would be the text value is two followed by the text value is three.
  • E. The output would be the text value is two, followed by the text value is three, followed by the text value is 2. 


D.

Note

A is incorrect because the code is legal despite the expression at line 5; the expression itself is a constant.

B is incorrect because it states that the switch() part can take a long argument.

Only byte, short, char,String, enum, and int are acceptable.

The output results from the value 2 like this: first, the option case 2: is selected, which outputs value is two.

There is no break statement between lines 4 and 5, so the execution falls into the next case and outputs value is three from line 6.

The default: part of a switch() is executed only when no other options have been selected, or if no break precedes it.

The output consists only of the two messages listed in D.




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