Java OCA OCP Practice Question 489

Question

Which of the following is not a possible result of executing the following application? 

public class MyClass { 
        public static void main(String... data) { 
           if(data.length>=1 
                 && (data[0].equals("sound") || data[0].equals ("logic")) 
                 && data.length<2) { 
              System.out.print(data[0]); 
           } 
        } 
}
  • A. Nothing is printed.
  • B. sound is printed.
  • C. The application throws an exception at runtime.
  • D. logic is printed. 


C.

Note

The key to understanding this question is to remember that the conditional conjunction && operator only executes the right-hand side of the expression if the left-hand side of the expression is true.

If data is an empty array, then the expression ends early and nothing is output.

The second part of the expression will return true if data's first element is sound or logic.

Since we know from the first part of the statement that data is of length at least one, no exception will be thrown.

The final part of the expression with data.length<2 doesn't change the output when data is an array of size one.

Therefore, sound and logic are both possible outputs.

Option C is the only result that is unexpected at runtime.




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