为何这样输出？

public class A{

public static void main(String as[]) {

try {

int x = 0;

float y = 0;

float z = x / y;

System.out.println("11");

try {

int a[] = new int[3];

a[3] = x;

System.out.println("22");

return;

} 

catch (Exception e) {

System.out.println("33");

return;

} 

finally {

System.out.println("44");

System.exit(0);

return;

}

} 

catch (ArithmeticException e) {

System.out.println("55");

return;

} 

finally {

System.out.println("66");

return;

}

}

}

我执行获得的结果是：

11

33

44

为何？