The following code shows the steps to save to a file.
If the file does not exist, the program will create it.
If it exists, it will be overwritten.
import java.io.Closeable; import java.io.File; import java.io.FileNotFoundException; import java.io.FileOutputStream; import java.io.IOException; public class Main { public static void main(String[] args) { String destFile = "Main.java"; // Get the line separator for the current platform String lineSeparator = System.getProperty("line.separator"); String line1 = "test"; String line2 = "line 2"; String line3 = "this is a test,"; String line4 = "."; try (FileOutputStream fos = new FileOutputStream(destFile)) { // Write all four lines to the output stream as bytes fos.write(line1.getBytes());/* ww w . j a va 2 s. c o m*/ fos.write(lineSeparator.getBytes()); fos.write(line2.getBytes()); fos.write(lineSeparator.getBytes()); fos.write(line3.getBytes()); fos.write(lineSeparator.getBytes()); fos.write(line4.getBytes()); // Flush the written bytes to the file fos.flush(); // Display the output file path System.out.println("Text has been written to " + (new File(destFile)).getAbsolutePath()); } catch (FileNotFoundException e1) { FileUtil.printFileNotFoundMsg(destFile); } catch (IOException e2) { e2.printStackTrace(); } } } class FileUtil { // Prints the location details of a file public static void printFileNotFoundMsg(String fileName) { String workingDir = System.getProperty("user.dir"); System.out.println("Could not find the file '" + fileName + "' in '" + workingDir + "' directory "); } // Closes a Closeable resource such as an input/output stream public static void close(Closeable resource) { if (resource != null) { try { resource.close(); } catch (IOException e) { e.printStackTrace(); } } } }