Multiple choice

What will be the output of the program? class BoolArray { boolean [] b = new boolean[3]; int count = 0;

void set(boolean [] x, int i) { x[i] = true; ++count; }

public static void main(String [] args) { BoolArray ba = new BoolArray(); ba.set(ba.b, 0); ba.set(ba.b, 2); ba.test(); }

void test() { if ( b[0] && b[1] | b[2] ) count++; if ( b[1] && b[(++count - 2)] ) count += 7; System.out.println("count = " + count); } }

  1. count = 0

  2. count = 2

  3. count = 3

  4. count = 4
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C Correct answer
Explanation

The reference variables b and x both refer to the same boolean array. count is incremented for each call to the set() method, and once again when the first if test istrue. Because of the && short circuit operator, count is not incremented during the second if test.

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