Loop Structure in java

Loops :

A loop statement allows us to execute a statement or group of statements multiple times and following is the general form of a loop statement in most of the programming languages.

 

1. While loop :- Repeats a statement or group of statements while a given condition is true. It tests the condition before executing the loop body.

 

Syntax :

 

while (boolean condition)

{

// loop statement.....

}

 

 

Example :

 

Class Technogeeks

{

public static void main(String arg[])

{

int x=1;

while (x<=4)

{

System.out.println("Value of x is" +x);

x++;

}

}

}

 

2. do While loop :- Like a while statement, except that it tests the condition at the end of the loop body.

 

Syntax :

 

do

{

   // Ststements......

}

while (condition);

 

 

Example :

 

class Technogeeks

{

public static void main(String args[])

{

int x = 21;

do

{

System.out.println("Value of x is" +x);

x++;

}

while (x<20);

}

}

 

3. For loop :- Execute a sequence of statements multiple times and abbreviates the code that manages the loop variable.

 

Syntax :

 

for(initialization condition; texting condition ; increment/decrement)

{

//Statements

}

 

Example :

 

Class Technogeeks

{

public static void main (String args[])

{

for(int x=2; x<=4; x++)

System.out.println("Value of x is " +x);

}

}

 

 

Infinite Loop

 

Example :

 

public class Technogeeks

{

public static void main(String[] args)

{

for(int i=5; i!=0; i -=2)

{

System.out.println(i);

}

int x=5;

While(x==5)

{

System.out.println("In the loop");

}

}