Example code using throws

package exceptions;
// throws keyword for delegating the responsibility of the Exception handling to the caller
public class ThrowsEx {
    public static void main(String a[])throws Exception //without throws error
    {
        doStuff();
    }
    public static void doStuff()throws Exception   //without throws error
    {
        doMoreStuff();
    }
    public static void doMoreStuff()throws Exception  //without throws error
    {
        System.out.println("hai"); 
        Thread.sleep(100);  // compile time error 
        //if we are using above code which is possible to rise the checked exception.
        //we must have to use eaither throws,try,catch.
    }
}