Question

in java, how can we execute an instruction only one time in a do while loop

do{
    int param;

    //execute this onty one time (depends of param)
    //other instructions instructions

}while(condition)

thank you

Answer 1

Putting the statement you want to execute only once is one way of doing it, but, of course, that assumes that the statement comes at the end or beginning of the loop, and doesn’t depend on the conditions of what goes on in the loop (either before or after). If you have something like this:

do {
  // do some stuff
  // one time condition
  // do some more stuff
} while(condition);

you won’t easily be able to pull that information outside of the loop. If this is your problem, my suggestion would be to place some sort of condition around the one-time statement(s) and update the condition when the statement has run. Something like this:

boolean hasRun = false;
do {
  // do some stuff
  if(!hasRun) {
    // one time condition
    hasRun = true;
  }
  // do some more stuff
} while(condition);