Java while

2. while :

Syntax:

while(expression)

{

statements;

Increment / decrement

}

Cool warning : Don't give semicolon after while

According to the syntax, the checking of expression will be done before the code got executed.
while loop holds an expression.
expression gives the result either true or false.

· if the result is true then while loop statements will executes.

· if the result is false then while loop terminates the execution.

· So, if expression result is false then it displays nothing.

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Program : A program to print Happy Bday 5 times

Program name : WhileDemo1.java

Output :

Happy Birthday

class WhileDemo1

{

public static void main(String args[])

{

int i = 1;

while(i<=5)

{

System.out.println("Happy Birthday");

i++;

}

Compile : javac WhileDemo1.java

Run : java WhileDemo1

Output :

Happy Birthday

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Program : A program to print 1 to 5 values

Program name : WhileDemo2.java

Output :

i value is : 1

i value is : 2

i value is : 3

i value is : 4

i value is : 5

class WhileDemo2

{

public static void main(String args[])

{

int i = 1;

while(i<=5)

{

System.out.println("i value is : "+i);

i++;

}

Compile : javac WhileDemo2.java

Run : java WhileDemo2

Output :

i value is : 1

i value is : 2

i value is : 3

i value is : 4

i value is : 5

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Conclusions :

do while - if condition fails once executes.

while - if condition fails it won’t executes.

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Thanks for your time.

- Nireekshan

Sunday 28 August 2016

Java while

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