Java interface throws an exception but interface implementation does not throw an exception? -

i read code interface throws exception, class implements doesn't throw 1 or catch one, why that? legal or safe in java?

import java.rmi.*; public interface myremote extends remote {     public string sayhello() throws remoteexception; }  import java.rmi.*; import java.rmi.server.*; public class myremoteimpl extends unicastremoteobject implements myremote{     public string sayhello() {         return "server says, 'hey'";     }     public myremoteimpl() throws remoteexception {}     public static void main (string[] args) {         try {              myremote service = new myremoteimpl();              naming.rebind("remotehello", service);         } catch(exception ex)         {             ex.printstacktrace();         }     } } 

a general rule of implementing , extending can make new class or interface "less restrictive" not "more restrictive". if think of requirement handle exception restriction, implementation doesn't declare exception less restrictive. codes interface not have trouble class.

— stan james

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as part of discussion @ http://www.coderanch.com/t/399874/java/java/methods-throwing-exception-interface