Programs on For loop, while loop and do-while loop

1. FOR LOOP

public class forloop
{
            public static void main(String[] args)
            {
                             for(int i=1;i<=20;i++)
                            {
                                      System.out.println(i);
                            }
             }
}

2. While LOOP

public class whileloop
{
                       public static void main(String[] args)
                      {
                             int i=1;
                             while(i<=20){
                                                        System.out.println(i);
                                                         i++;
                                                }
                       }
}


3. Do-while Loop

public class dowhileloop
{
                         public static void main(String[] args)
                        {
                                         int j=1;
                                        do{
                                                        System.out.println(j);
                                                         j++;
                                             }while(j<=10);
                         }  
}