A program to now whether given input is class or interface name

//app1.java

public class app1

{

                public static void main(String args[])throws Exception

{

                Class c=Class.forName (args [0]);

                boolean b=c.isInterface();

                if(b)

                                System.out.println (args [0] +"is an interface");

                else

                                System.out.println (args [0] +" is a class");

}

}

In command prompt

C:\java\adv java>javac app1.java

C:\java\adv java>java app1 java.lang.System

java.lang.System is a class

C:\java\adv java>java app1 java.lang. Runnable

Java.lang. Runnable is an interface

C:\java\adv java>