求大虾指教关于IOException的问题急

1．假设类IOException是类Exception的子类，请指出下列程序执行时标准输出显示的内容。import java.io.*;
class ExceptionTest {
public void trythis() {
  try {
System.out.println("1");
throw new IOException();
  } catch (Exception e1) {
System.out.println("2");
  } finally {
System.out.println("3");
  }
  System.out.println("4");
}
public static void main(String[] args) {
  ExceptionTest et = new ExceptionTest();
  et.trythis();
}
}