What is the output(boolean and logical operators)? : Questions « Operators « SCJP

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public class MainClass {
  public static void main(String[] args) {
    String s = "";
    Boolean b1 = true;
    Boolean b2 = false;
    if ((b2 = false) | (21 % 5) > 2)
      s += "x";
    if (b1 || (b2 = true))
      s += "y";
    if (b2 == true)
      s += "z";
    System.out.println(s);
  }
}