The do while is very similar to the while loop in the way it works, but is exit controlled (unlike the for and while loops which are entry controlled), that is, the truth value of its expression is evaluated after the execution of Statements.

do
{
    // Statements
}
while (expression);

This kind of loop is particularly useful if you want your Statements to be executed at least once, irrespective of what expression evaluates to. You want to do this if you are initializing a variable inside your loop and plan on using its value later.

int iter_DoWhile = 20;
do
{
    System.out.print (iter_DoWhile + " ");

    // Increment the counter
    iter_DoWhile++;
}
while(iter_DoWhile < 10);
System.out.println ("iter_DoWhile Value: " + iter_DoWhile);

Output:

20
iter_DoWhile Value: 21

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