Loops in JAVA | Java Language | Coding Winds

                             LOOPS

What happens when you want to listen to a song on repeat ? Yes, you loop that particular song, maybe until your mood for that song changes or maybe until you are bored of listening to that same song. So loops in a programming languages aren’t different, they loop a task which you want them to perform under certain condition, and terminate after that condition becomes false. There are basically three types of loops in java;

i) For loops

ii) While loops

iii) do while loops

For loops

‘For loop’ are quite common and efficient loops ,since they allow you to fully control them. The basic syntax of the ‘for loops’ is given below:

Syntax:

for(initialisation; condition; increment/decrement){

//loop body

}

In the above syntax of the for loops we can see that, in the round brackets present just after the keyword ‘for’ we can initialise a variable, then just after initialisation after a semicolon we can set the condition until which our loop will run. And finally after the condition, after a semicolon we can set the variable to increment or decrement its value each times after it executes throughout the body with the prior value of the variable. The example below shows us the working of a loop.

for(int i=1; i<11; i++) {

System.out.println("2 X "+i+"="+2*i);

}

Output screen :

                                            

While loops

While loops are the most basic loops as they allow you to run your statements until a condition becomes false. They first check the condition , if it’s true they enter the loop body, they terminate as soon the condition becomes false. This loop starts with the keyword ‘while’ followed by the condition inside the round brackets. The basic syntax for the while loops can be seen below:

Syntax:

while(condition){

//loop body

}

Though the syntax doesn’t mention any variable initialisation but any externally initialised variable value can be incremented or decremented at the end of the while loop manually. The example below illustrates its working in detail

Ex:

int i=1;

while(i<11){

System.out.println("2 X "+i+"="+2*i);

i++;

}

Output Screen :

                                    

  

Do while loops

What if you wish to perform a certain task and then check a condition. Well for this we have ‘do-while loops’ , in do-while loop we can perform a certain task and at the end of the loop body we can check the condition. These loops are written by using the keyword ‘do’ followed by the loop body and then the condition after the keyword ‘while’ inside the round brackets, with semicolon as a suffix. The basic syntax is given below

Syntax:

do{

}while(condition);

Remember that in the do-while loops after writing the condition inside the round brackets we have to put a semicolon. These are the only loops which have semicolon in their syntax. Below is the example of the do-while loops.

int i=1;

do {

System.out.println("2 X "+i+"="+2*i);

i++;

}while(i<11);

 

Output Screen :

                                    

Hope you are clear on this  topic do read our more articles on JAVA LANGUAGE.

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This article is SUBMITTED By : Pranjal Rai

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