About threads? ? ? ? ?

wongzhe

import java.io. *;
class FileTest {
 public static void main (String [] args) throws Exception {
 File f = new File ("1.txt");
 f.createNewFile ();
 f.deleteOnExit ();
 Thread.sleep (30000); / * This code, I think it should be Thread.sleep (3000); and then f.deleteOnExit (); instead of now, how can this be the first time to get out and sleep for three seconds? ? ? ? ? * /
 Ranch
 Ranch
 Ranch
 }
}
 Please help me look at that problem ...

wongzhe

I add: the textbook says "call this method f.deleteOnExit (); and let the thread sleep."
 What's going on? ? ?

twc113523

What do you want to ask? What it means is to exit after 30 seconds. Give you time to see this file deleted.
If the thread does not sleep, maybe you have not seen the effect, the program has completed execution

hikerlove

Right upstairs, deleteeonexit () is deleted when you quit, it gives you 30 seconds. I guess I'm afraid to give you 3 seconds. You have deleted the file before you find it!

sunjingyao

Not bad

jerryxv

deleteOnExit
public void deleteOnExit () Requests the deletion of the file or directory represented by this abstract path name when the virtual machine terminates. Only when the virtual machine terminates normally will the delete operation be attempted, as defined in the Java Language Specification.
Once a delete operation has been requested, the request cannot be canceled. So use this method with caution.

Note: This method should not be used for file locking as the resulting protocol may not work reliably. FileLock facilities should be used instead.


Throws:
SecurityException-if a security manager exists and its SecurityManager.checkDelete (java.lang.String) method denies delete access to the file
Since:
1.2
See also:
delete ()