Java Throwing Exceptions.

  • We can throw our own exceptions on:
    1. either instances of Exception,
    2. one of its existing subclasses, or
    3. our own specialized exception classes
    Our own created exception example:
    ...
    class SecurityException extends Exception {
     SecurityException() { super(); }
     SecurityException( String desc ) {
                super( desc );
       }
    }
    ...
    public void checkRead( String s ) {
       if ( new File(s).isAbsolute(  ) || (s.indexOf("..") != -1) )
         throw new SecurityException("Access to file : "+ s +" denied.");
    }
    ...
  • In this case, we throw in our method an SecurityException, which we earlier have created.
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