java - How to throw exception for statment? -

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Hello! I want to throw exceptions for the line. 

  barcode no = long.partial long (jTextField1.getText ())   
 I did it in a way / P> 
  not barcode = long.parseong (jTextField1.getText ()) New numberFormat exceptions throw ("Enter numbers only");   
 But in this manner the compiler error says ";"  
 
  
 
 
 "> 
 If the text is not in the correct format then  message , then you have to catch the exception and throw a new one:  
 Try  {barcode = long.parsling (jTextField1 gettext ());} hold (NumberFormatException e) {new number FormatAccertation ("Enter numbers only");}   
 I Do not suggest that you send a user-view message Trying to use the exception message as sh - though they are more appropriate for logging from appearing to the end user.

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