Computer Science - Basic Java

2 PRINTWRITER CLASS Java provides output facilities through various classes. You are likely very familiar with System.out by now (using its output methods print/println/printf). Inspecting the System class you will see that out, a static field, is an instance of the Printstream class. This endows it with many methods such as print/println/printf. To write to a file, we will use the java.io Printwriter class. It is quite similar to system.out in that Printwriters have print/println/printf methods. When constructing a Printwriter, the constructor determines the destination of output. Should a File be passed in, all output is directed the file. PrintWriter pw! = new PrintWriter(System.out); PrintWriter pw2 = new PrintWriter("myfile.txt "); Note: Printwriters do not always push their output to the destination immediately When printing to a file, call close() to ensure all output is pushed to the file When printing to the screen, one may need to call flush() to get text to appear (especially when you've written part of a line but not the newline character). In subclasses, flush() can be added to print/println to do this. Make sure NOT to call close) on a Printwriter that is writing to the screen: this will close System.out and prevent ALL further output from being printed to the screen