Java自定义异常

 class OwnException extends Exception {
      public OwnException(String msg) {              
            super(msg);
            System.out.println("hello myexception");
        }

}
class OwnExceptionSource {
      public void a() throws OwnException{
             throw new OwnException(null);
         }

}
public class OwnExceptionHandler1{
    public static void main(String[] args) {
         OwnExceptionSource r = new OwnExceptionSource();
            try{
                r.a();
                //System.out.println("in try block");
            }catch(Exception e) {
                //System.out.println("in catch block");
                e.printStackTrace();
            }finally{
                System.out.println("the last");
            }
            //System.out.println("after exception");
        }    
}