The For Loop

In Java as you can use a for loop when looping is required in the program. As you can see in the program below the for loop executes the commands inside et brackets until something is fulfilled:

//Counting program

class CountToTen {
  public static void main (String args[]) {
    int i;
    for (i=1; i <=1024; i = i + 1) { 
      System.out.println(i);
    } 
    System.out.println("This program just counted 1024 times for no reason.");
  }
}

All this program does is that counts from 1 to 1024 and prints them out. It starts by making i=1. Then it sees if i is less than or equal to 1024 and because it isn't it, it does what is written inside the brackets. Then it makes i bigger by one because we specified it to be increased by one. The for loop starts again but this time it ignores the statement that tells it to make i=1 and goes through the rest of the loop. The loop happens over and over until the value of i <=1024. When the loop is finished, the program prints "This program just counted 1024 times for no reason."

Assigning, Adding, Subtracting.

Usually when loops are written, people use + + or - - rather than n = n + 1 or n = n - 1. You can see what is written below.

//Count to ten
class CountToTen {
  public static void main (String args[]) {
    int i;
    for (i=1; i <=1024; i++) { 
      System.out.println(i);
    } 
    System.out.println("This program just counted 1024 times for no reason.");
  }
}

The ++ after a variable is the same thing as i=i+1 or i+=1. Any of these ways can be used in a for loop. you can also subtract the same way. N = N - 1 can also be written as N - - or N - =1.