下面程序的输出是什么?
public class TestDemo { public static String output = ""; public static void foo(inti) { try { if (i == 1) { throw new Exception(); } } catch (Exception e) { output += "2"; return ; } finally { output += "3"; } output += "4"; } public static void main(String[] args) { foo(0); foo(1); System.out.println(output); } }