Añadido resto de tema

src/main/java/iesthiar/_343_OutputStreamWriter.java

@@ -0,0 +1,23 @@
+package iesthiar;
+
+import java.io.BufferedWriter;
+import java.io.File;
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.io.OutputStreamWriter;
+
+public class _343_OutputStreamWriter {
+    public static void main(String[] args) {
+        File f = new File("fichero.txt");
+        try (
+                FileOutputStream fos = new FileOutputStream(f, true);
+                OutputStreamWriter osw = new OutputStreamWriter(fos, "ISO-8859-1");
+                BufferedWriter bfw = new BufferedWriter(osw)) {
+            bfw.write("Esto es un texto");
+            bfw.newLine();
+            bfw.write("Esto es otro texto con eñe");
+        } catch (IOException ex) {
+            System.err.printf("Error:%s", ex.getMessage());
+        }
+    }
+}