A. The expression on line 5 is true when row * col is an even number. On the first
iteration, row = 1 and col = 1, so the expression on line 6 is false, the continue is
skipped, and count is incremented to 1. On the second iteration, row = 1 andChapter 3: Core Java APIs 339
col = 2, so the expression on line 6 is true and the continue ends the outer loop with
count still at 1. On the third iteration, row = 2 and col = 1, so the expression on line
6 is true and the continue ends the outer loop with count still at 1. On the fourth
iteration, row = 3 and col = 1, so the expression on line 6 is false, the continue is
skipped, and count is incremented to 2. Finally, on the fifth and final iteration, row
= 3 and col = 2, so the expression on line 6 is true and the continue ends the outer
loop with count still at 2. The result of 2 is displayed, so the answer is option B.

19. Which of these classes compile and use a default constructor? (Choose all that apply)
A. public class Bird { }
B. public class Bird { public bird() {} }
C. public class Bird { public bird(String name) {} }
D. public class Bird { public Bird() {} }
E. public class Bird { Bird(String name) {} }
F. public class Bird { private Bird(int age) {} }
G. public class Bird { void Bird() { }

19. A, G. Options B and C don’t compile because the constructor name must match the
classname. Since Java is case sensitive, these don’t match. Options D, E, and F all compile and provide one user-defined constructor. Since a constructor is coded, a default
constructor isn’t supplied. Option G defines a method, but not a constructor. Option A
does not define a constructor, either. Since no constructor is coded, a default constructor is provided for options A and G.

  static {
    if (true) {
      throw new NullPointerException();
    }
  }

  static {
    throw new NullPointerException();
  }

  static {
    while (false) {

    }
  }