Java autogenerate directories if exists

Question

I\'m trying to check if a directory exists, if that happens I want to give it another number, for example, if \"folderX\" exists I want to create a new one called \"FolderX1\",

Answer 1

Basically, you need some kind of loop that can determine if the incrementing folder still exists...

File makeMe = new File(folder);
int index = 0;
String master = folder;
while (makeMe.exists()) {
    folder = master + (++index);
    makeMe = new File(folder);
}

If you're worried about creating an infinite loop, you could place a maximum range...

int maxRange = 100;

File makeMe = new File(folder);
int index = 0;
String master = folder;
while (makeMe.exists() && index < maxRange) {
    makeMe = new File(master + (++index));
}

if (index > maxRange) { // || makeMe.exists()
    throw new IOException("Could not find free directory");
} else {
    // All happy unicorns...
}

Answer 2

String folderPrefix = "folder";
int folderSuffix = 0;
File fa = new File(folderPrefix + folderSuffix);

while (fa.exists()) {
  fa = new File(folderPrefix + folderSuffix++);
}