What is the value displayed? : Questions « Operators « SCJP

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public class MainClass{
       public static void main(String[] args) {
            int x = 0;
            boolean b1, b2, b3, b4;
            b1 = b2 = b3 = b4 = true;
            x = (b1 | b2 & b3 ^ b4) ? x++ : --x;
            System.out.println(x);
       }
      }