在for循环中重命名文件时出错

Question

I have this code in Java. The randomName() function returns a string with (unsurprisingly) a random string.

File handle = new File(file);
String parent = handle.getParent();
String lastName = "";
for (int i = 0; i < 14; i++)
{
    lastName = parent + File.separator + randomName();
    handle.renameTo(new File(lastName));
}
return lastName;

I have the appropriate permissions, and when I log to logcat the randomName() function does all the strings, but upon the end of the loop handle appears to have a file name of the value of the first randomName() call.

Answer 1

The reason this didn't work as expected is because once the file was renamed the first time, handle no longer referred to the file. That is why the subsequent rename operations failed. File represents a path name, not an actual object on disk.

Answer 2

This is my solution:

File handle = null;
        String parent = "";
        String lastName = "";

        for (int i = 0; i < 14; i++)
        {
            if (i == 0)
            {
                handle = new File(file);
                parent = handle.getParent();
            }
            else
            {
                lastName = parent + File.separator + randomName();
                handle.renameTo(new File(lastName));
                handle = new File(lastName);
            }

        }