Help me solve this prblm?

Question

Help me in knowing what wrong did i did in this.
https://code.sololearn.com/c3H2lSDVM5Tr/?ref=app

Answer 1

You may forgot to write access specifier with functions on line 6 & 14 which should be public.

Also you don't need to write
public interface Runnable{
void run();
}

Remove these lines and it will work.

Answer 2

Thank u

Answer 3

next experiment
if (i==5)
try { Thread.sleep(1000); }
catch(InterruptedException e) { }