For Java 6 (and 5 too, I think): BufferedImage bufferedImage = new BufferedImage(image.getWidth(null), image.getHeight(null), BufferedImage.TYPE_INT_RGB); g = bufferedImage.createGraphics(); //Color.WHITE estes the background to white. You can use any other color g.drawImage(image, 0, 0, bufferedImage.getWidth(), bufferedImage.getHeight(), Color.WHITE, null);
I presume you are running these chmod commands in a loop – otherwise I don’t see why you’d get so many exceptions. It’s possible that you’re hitting a deadlock because you’re not reading the output of the spawned processes. That certainly used to bite me back in the pre-ProcessBuilder, Runtime.exec() days. Change your code snippet … Read more
BufferedWriter is more efficient if you have multiple writes between flush/close the writes are small compared with the buffer size. In your example, you have only one write, so the BufferedWriter just add overhead you don’t need. so does that mean the first example writes the characters one by one and the second first buffers … Read more
1. Without changing your code, you must place the file in the project’s root folder. Otherwise, reference it as src/frp/dichromatic.dat 2. Doing something like this: public static void main(String[] args) { FileReader file = null; try { file = new FileReader(new File(“dichromatic.dat”)); } catch (FileNotFoundException e1) { System.err.println(“File dichromatic.dat not found!”); e1.printStackTrace(); } BufferedReader br … Read more
The basic problem you have with NFS is that it caches attributes, files and directories information. This means the information can be out of date. You might be able to turn off caching, you will see a significant reduction in performance. The important thing to remember is that NFS is not a messaging service and … Read more
Use File‘s getParentFile() method and String.lastIndexOf() to retrieve just the immediate parent directory. Mark’s comment is a better solution thanlastIndexOf(): file.getParentFile().getName(); These solutions only works if the file has a parent file (e.g., created via one of the file constructors taking a parent File). When getParentFile() is null you’ll need to resort to using lastIndexOf, … Read more
No, there is no built-in method to do that. The closest to what you want to accomplish is the transferFrom method from FileOutputStream, like so: FileChannel src = new FileInputStream(file1).getChannel(); FileChannel dest = new FileOutputStream(file2).getChannel(); dest.transferFrom(src, 0, src.size()); And don’t forget to handle exceptions and close everything in a finally block.
The listFiles method, with or without a filter does not guarantee any order. It does, however, return an array, which you can sort with Arrays.sort(). File[] files = XMLDirectory.listFiles(filter_xml_files); Arrays.sort(files); for(File _xml_file : files) { … } This works because File is a comparable class, which by default sorts pathnames lexicographically. If you want to … Read more
How can I create new File (from java.io) in memory , not in the hard disk? Maybe you are confusing File and Stream: A File is an abstract representation of file and directory pathnames. Using a File object, you can access the file metadata in a file system, and perform some operations on files on … Read more
49 is the ASCII value of the char 1. It is the value of the first byte. The stream of bytes that is produced when you enter 10Enter on your console or terminal contains the three bytes {49,48,10} (on my Mac, may end with 10,12 or 12 instead of 10, depending on your System). So … Read more