请教为什么没有打印exception

public static void main(String[] args) 2     { 3  4         try 5         { 6             Thread thread = new Thread(){ 7                 @Override 8                 public void run() 9                 {  10                     int i = 0;11                     System.out.println(2/i);12                 }13             };14             thread.start();15         }16         catch (Exception e)17         {18             System.out.println("exception");19         }20     }