The Properties API doesn’t provide any methods for adding/replacing/removing a property in the properties file. The model that the API supports is to load all of the properties from a file, make changes to the in-memory Properties object, and then store all of the properties to a file (the same one or a different one). … Read more
3.png is a directory, because you make it so by calling f.mkdirs();. Try f.getParentFile().mkdirs() instead. From the documentation: Creates the directory named by this abstract pathname, including any necessary but nonexistent parent directories. Note that if this operation fails it may have succeeded in creating some of the necessary parent directories. (emphasis mine). In other … Read more
Looks like the answer is no: http://download.oracle.com/javase/1.4.2/docs/api/java/io/FileOutputStream.html http://docs.oracle.com/javase/7/docs/api/index.html?java/io/FileOutputStream.html There are no public methods that return the File or String used in construction of the stream. EDIT: The same holds for FileInputStream.
BufferedOutputStream helps when the writes are smaller than the buffer size e.g. 8 KB. For larger writes it doesn’t help nor does it make it much worse. If ALL your writes are larger than the buffer size or you always flush() after every write, I would not use a buffer. However if a good portion … Read more
With sdk, you can’t write to the root of internal storage. This causes your error. Based on your code, to use internal storage with sdk: final File dir = new File(context.getFilesDir() + “/nfs/guille/groce/users/nicholsk/workspace3/SQLTest”); dir.mkdirs(); //create folders where write files final File file = new File(dir, “BlockForTest.txt”);
I don’t know if it’s the only problem, but you’ve got a classic Java glitch in there: You’re not counting on the fact that read() is always allowed to return fewer bytes than you ask for. Thus, your read could get less than 1024 bytes but your write always writes out exactly 1024 bytes possibly … Read more
Another bug in Java. I seldom find them, only my second in my 10 year career. This is my solution, as others have mentioned. I have nether used System.gc(). But here, in my case, it is absolutely crucial. Weird? YES! finally { try { in.close(); in = null; out.flush(); out.close(); out = null; System.gc(); } … Read more
Use the constructor that takes a File and a boolean FileOutputStream(File file, boolean append) and set the boolean to true. That way, the data you write will be appended to the end of the file, rather than overwriting what was already there.
It will throw a FileNotFoundException if the file doesn’t exist and cannot be created (doc), but it will create it if it can. To be sure you probably should first test that the file exists before you create the FileOutputStream (and create with createNewFile() if it doesn’t): File yourFile = new File(“score.txt”); yourFile.createNewFile(); // if … Read more