Java Starting Pro

Flip.java

public class Flip 

{

              public static void main(String[] args)

{ 

        if (Math.random() < 0.5) 

        System.out.println("Heads");

        else                     

        System.out.println("Tails");

    }

}

TenHellos.java

public class TenHellos

{ 

 public static void main(String[] args) 

{

       System.out.println("1st Hello");

      System.out.println("2nd Hello");

      System.out.println("3rd Hello");

                              int i = 4;

                 while (i <= 10) 

     {

         System.out.println(i + "th Hello");

         i = i + 1;

      }

    }

}

PowersOfTwo.java

public class PowersOfTwo 

{

public static void main(String[] args) 

{

        int N = Integer.parseInt(args[0]);

        int i = 0;                

        int powerOfTwo = 1;       

                     while (i <= N) 

 {

            System.out.println(i + " " + powerOfTwo);   

            powerOfTwo = 2 * powerOfTwo;                

            i = i + 1;

        }

     }

}

DivisorPattern.java

public class DivisorPattern 

{

public static void main(String[] args) 

{ 

        int N = Integer.parseInt(args[0]);

                           for (int i = 1; i <= N; i++)

            {

            for (int j = 1; j <= N; j++) 

            {

                if (i % j == 0 || j % i == 0) 

            {

                    System.out.print("* "); 

                }

                else 

            {

                    System.out.print("  "); 

                }

            }

            System.out.println(i);

        }

    }

}