Delete all files with an extension using Java

Question

I\'m (relatively) new to Java and I\'m trying to implement a .jar that runs a list of commands that in Windows XP\'s command prompt it would be:

cd\\
cd myfolder         


        

Answer 1

for (File f : folder.listFiles()) {
    if (f.getName().endsWith(".lck")) {
        f.delete(); // may fail mysteriously - returns boolean you may want to check
    }
}

Answer 2

Java 8 approach

Arrays.stream(yourDir.listFiles((f, p) -> p.endsWith("YOUR_FILE_EXTENSION"))).forEach(File::delete);    

Answer 3

fList.get(i) should be fList[i] as fList is an array, and it returns a File reference not a String.

Change: -

String pes = fList.get(i);

to: -

File pes = fList[i];

And then change if (pes.contains(".lck") == true) to
if (pes.getName().contains(".lck"))

In fact, since you are checking for the extension, you should use endsWith method rather than contains method. And yes, you don't need to compare your boolean value with ==. So just use this condition: -

if (pes.getName().endsWith(".lck")) {
    boolean success = (new File(fList.get(i)).delete());
}

Answer 4

You are using Collection method get on an Array. Use Array Index notation as below:

        File pes = fList[i];

Also better to use endsWith() String method over the file name as:

   if (pes.getName().endsWith(".lck")){
      ...
   }

Answer 5

Final Code which works :)

File folder = new File(dir);
                File fList[] = folder.listFiles();

                for (File f : fList) {
                    if (f.getName().endsWith(".png")) {
                        f.delete(); 
                    }}