Java Essentials - Do while loop in java

In this video we are going to discuss do while loop in Java

In the previous video we have discussed while loop in Java. So it is a new one that is a do while loop in Java and also we shall discuss what is the

difference between these two. The do while loop is similar to the while loop but in this case the statements will be

executed at least once. In case of do while what is happening the condition is going to get checked at the

end of the conditional code. So, that's why the code can get executed at least once

But in case of while do, as the condition is coming at front, so when the condition is

false, the code may not get its execution. The basic syntax is like this. So, do, then

curly breasts. Then here you'll be having the set of statements which will be there within the

do while construct body, and then while and the bullion expression. And when the bullion expression will

be false, then after executing these statements, the control will come out from this

due while construct and executing this one once only But when this condition is true then it will go on executing for multiple number of times until the bullion expression is turned to false the loop

will execute and will be continued so here is a very easy flowchart for us so control is coming

from here so the code block will get executed then the condition will be checked and if the

condition is found true then code block will have its re-executive execution but if the condition is false then control will come out and ultimately the program

will get terminated so let us go for one demonstration for the easy understanding of this do while

loop in java in this demonstration we are discussing do while loop in java in case of do while loop

at first we'll be writing a do and then carly presses will indicate the do block then following that

we'll be writing while and while we'll be having one condition and don't forget to

give this semicolon at the end so in other video we have discussed the while loop

and this video we're discussing the do while loop the basic difference between

do while and while do is that in case of do while at first the block will get executed and then while will check the condition that means initially if the condition is false then also the block

will get its execution at least for once but in case of while what happens while

will be there with the condition so that means when the condition is initially false

then the control cannot come into the while block so the block may have execution

for zero number of times also but in case of do while the do block

must get executed at least for once and it may get iterated for multiple

number of times when the condition will remain true so that is a basic

difference between do while and while do okay here we have initialized a with

zero and sum will be equal to zero a and some both of the type integer variable

so system dot out dot print ellen the value of a I printed the value of a here

and then sum is equal to some plus a so at first the value of a is zero so

0 has to be printed sum is equal to sum plus a 0 will be added with the sum and a has got

incremented so now a has become 1 as 1 is less than 10 the condition is true so again it will go into the do block and it will go on executing until the value of a is becoming 10 so what will happen when the nine

will be the value of a will be in a then nine will get added so nine will get

incremented by one now it will become ten so ten less than ten the condition

will be false it will come out from the while do while and then the last line is

getting printed that is a sum of the numbers from zero to nine will be some so

now let me go for the execution you can find that a is ranging from zero to nine

and the sum is getting obtained as 45 so I am expecting this condition is

becoming false when value of a is becoming 10 so if I print the value of a here

if I print the value of a here so if I write a is equal to then obviously I'm

expecting that this value of a will be printed as 10 here you can find that yes

the value of a is becoming 10 so 10 less than 10 the condition is getting false and it is the control is coming out from this do while construct

So in this demonstration you are getting idea that how to use do while construct in our Java coding

Thanks for watching this video