java编译器（jdkv11.0.2）给出了上述错误。
实际上，我试着用java中的多线程函数编写代码，同时打印从1到5再到5到1的数字，延迟200ms，但它显示了try-and-catch block-error的错误：
catch类型的非法开始（异常e）

class Threaddemo extends Thread
{
   public static void run() 
   try
   {
     for(i=1;i<=5;i++)
     {
       System.out.println(i);
       Thread.sleep(200);
     }
   }
   catch(Exception e)
   {
     System.out.println("exception found");
   }
}

class Threaddemo1 extends Thread
{
  public static void run()
  {
    try
    {
      for (i=5;i>=1;i--)
      {
        System.out.println(i);
        Thread.sleep(200);

      }
    }
    catch(Exception e)
    {
      ("exception2 found");
    }
  }
}

class mainclass
{

public static void main(String arg[])

  {
    threaddemo obj1=new threaddemo1();
    threaddemo1 obj2=new threaddemo();
    obj1.start();
    obj2.start();
  }
}