Loops

A simple introduction about Loops in java programming

There are mainly three types of loops.
                 1.For loop
                 2.While loop
                 3.Do While loop

As in the name the "Loop" means a cycle ,which it stops after a certain boolen condition.

In this post i will describe about the For loop.

Here is a small Example for the for loop.

class Myjava {
    public static void main(String args[]){
        for(int x=0 ; x<5 ; x++){
        System.out.print("kamal-->");
        System.out.println(x);
        }
    }
}

out put of the programme-->
                                   kamal-->0
                                   kamal-->1
                                   kamal-->2
                                   kamal-->3
                                   kamal-->4

Now i will describe the programme for you.

int x -->  we called this as initialization statement.The variable x is local to only for loop.

x < 5 --> In a for loop the second statement should be a  full fill Boolean condition.
               Other wise the programme will give a compile error.

x++  -->  we called this as the generally inclement statement.

please check out the out put of the below programme.

class Myjava {
    public static void main(String args[]){
        for(int x=2 ; x<=10 ; x=x+2){
        System.out.print("Even Number-->");
        System.out.println(x);
        }
    }
}

out put of the programme-->
                              Even Number-->2
                              Even Number-->4
                              Even Number-->6
                              Even Number-->8
                              Even Number-->10

Above programme output the even numbers up to 10.

Using the for loops we can done more mathematical calculations.

Here is a Example -

class Myjava {
    public static void main(String args[]){
        int sum=0;
        for(int x=0;x<=10;x++){
            sum =sum+x;
        }
        System.out.println(sum);
    }
}

out put of the programme --> 55

This programme out put the sum of first 10 ten numbers--> 1+2+3+4+5+6+7+8+9+10 =55


for your more knowledge -->

Java naming standards

An identifier can be started with a alphabet character.

 class Myjava{
          int 4x = 2 ; --> incorrect
          int $x = 2 ; --> correct
          int -x = 3 ; --> correct
          int x+y = 4 ; --> incorrect
          int double = 4 ; --> in correct
          int x4y = 3; --> correct
}

Class name have to started with a capital letter.
Method and Variable names have to started with simple letter.

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