请阅读程序，然后写出程序运行结果 。（请注意输出不换行）public class Demo3 {public static void main(String[] args) {int a=9,b=0;double x=9,y=0;try {int c=a/b;}catch(Exception e1) {System.out.print("1");try {double z=x/y;}catch(Exception e2) {System.out.print("2");}finally {System.out.print("3");}}finally {System.out.println("4");}}}