Java自动生成目录（如果存在）

基本上，您需要某种循环来确定增量文件夹是否仍然存在…

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

如果您担心创建无限循环，可以放置最大范围…

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...}