java. the output is

x z

false

Can you explain me the following code?

public class BoolTest {

public static void main(String[] args) {

Boolean b1 = new Boolean("false");

boolean b2;

b2 = b1.booleanValue();

if (!b2) {

b2 = true;

System.out.print("x ");

}

if (b1 & b2) {

System.out.print("y ");

}

System.out.println("z");

System.out.println(b1);

}

}