写出程序结果 public class Demo { public static String output = ""; public static void foo(int i) { try { if (i == 1) throw new Exception(); output += "1"; } catch (Exception e) { output += "2"; return; } finally { output += "3"; } output += "4"; } public static void main(String[] args) { foo(0); System.out.println(output); foo(1); System.out.println(output); } }