To use classes that are in package their are 3 different ways.

1. Using fully qualified class name.

   mypack.start ob = new mypack.start();
   
   java.util.Scanner sc = new java.util.Scanner();
   

2. Importing single class

   import mypack.start;
   import java.util.Scanner;
   
   public class Dummy{
   
   		public static void main(String arg[]){
   				
   				Scanner sc = new Scanner();
   				
   				
   		}
   		
   		
   }	
   

3. Import all classes

   import mypack.*;
   import java.util.*;
   
   public class Dummy{
   
   		public static void main(String arg[]){
   				
   				Scanner sc = new Scanner();
   				start st = new Start();
   				
   		}
   		
   		
   }