Significance of the THROWS clause.

Question

I havent understood the meaning of the THROWS keyword at all.
For example,in JSP there is an interface called Tag,which has
a method :
public int doEndTag() throws JspExceptionIf I extends this class :
public class Trial extends Tag {
   public int doEndTag throws JspException{
   return 0;
}Now where do I need to use THROWS.
What is the exact significance of this please?

Answer 1

Just write it as:
public int doEndTag { return 0; }
The interface contract says that you may throw JspException in your implementation, but you don't have to. If you know you won't throw it, then declare your method like the above. If, however, you want your class to also be overrideable so that a subclass can re-implement your doEndTag method and possibly throw JspException in their implementation, then you'd have to still declare your doEndTag method as you originally did (with throws JspException).