Prior to Java 6,  there is no good solution at the Java level to provide file permission management. You need to implement your own native methods or call the Runtime.exec() to invoke the system routine such as chmod in LInux. Since Java 6, Java introduces a set of methods which can be used to set the file permission at Java level. These methods include:File.setReadable(boolean);File.setWritable(boolean);FIle.setExecutable(boolean);File.setReadable(boolean, boolean);File.setWritable(boolean, boolean);FIle.setExecutable(boolean, boolean);Here File.setReadable(boolean, true) is the same as ...