File folder = new File("c:/xxx");
File [] files = folder.listFiles(new FilenameFilter(){
@Override
public boolean accept(File dir, String name) {
if (name.toLowerCase().endsWith(".jpg")){
return true;
}
return false;
}
});
for(int i = 1; i<= files.length; i ++){
File file = new File("c:/xxx/img" + i + ".jpg");
files[i].renameTo(file);
}

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