refactored alpha and started document

src/main/java/rocks/zipcode/AlphaCharDocument.java

@@ -9,45 +9,24 @@ import java.util.Scanner;
 public class AlphaCharDocument extends Document {
 
 
-private File file;
-
 
     public AlphaCharDocument(String fileName) throws IOException {
         super(fileName);
-        this.file = new File(fileName);
-       // this.fileName = fileName;
-       // fw = new FileWriter(file);
     }
 
     @Override
     public void write(String contentToBeWritten) {
         try {
-            FileWriter fw = new FileWriter(file);
             isAlpha(contentToBeWritten);
-            fw.write(contentToBeWritten);
-            fw.close();
-        } catch (IOException ex) {
-            ex.printStackTrace();
-        }
-    }
-
-    public String read() throws FileNotFoundException {
-        try {
-            Scanner scanner = new Scanner(file);
-            StringBuilder sb = new StringBuilder();
-            while(scanner.hasNextLine()){
-                sb.append(scanner.nextLine());
-            }
-            String content = sb.toString();
-            return content;
-
-    } catch (IOException e) {
+            super.write(contentToBeWritten);
+        } catch (IOException e) {
             e.printStackTrace();
         }
-        return null;
     }
 
-    private void isAlpha(String s) throws IOException {
+
+
+    private void isAlpha(String s) throws IOException{
         if(!s.matches("[a-zA-Z\\s]*"))
             throw new IllegalArgumentException();
     }

src/main/java/rocks/zipcode/Document.java

@@ -12,22 +12,24 @@ import java.util.Scanner;
 public class Document implements DocumentInterface {
 
     private final FileWriter fw;
-   // private final File file;
+    private final BufferedReader br;
+    private final File file;
 
     public Document(String fileName) throws IOException {
         this(new File(fileName));
     }
 
     public Document(File file) throws IOException {
-      //  this.file = file;
+        this.file = file;
         this.fw = new FileWriter(file);
+        this.br = new BufferedReader(new FileReader(file));
     }
 
     @Override
     public void write(String contentToBeWritten) {
         try {
             fw.write(contentToBeWritten);
-            fw.close();
+            fw.flush();
         } catch (IOException ex) {
             ex.printStackTrace();
         }
@@ -35,17 +37,6 @@ public class Document implements DocumentInterface {
 
     @Override
     public void write(Integer lineNumber, String valueToBeWritten) {
-//        Scanner scanner = null;
-//        try {
-//            scanner = new Scanner(file);
-//        } catch (FileNotFoundException e) {
-//            e.printStackTrace();
-//        }
-//        StringBuilder sb = new StringBuilder();
-//        while(scanner.hasNextLine()){
-//            sb.append(scanner.nextLine());
-//        }
-//        String content = sb.toString();
 
     }
 
@@ -56,7 +47,15 @@ public class Document implements DocumentInterface {
 
     @Override
     public String read() throws FileNotFoundException {
-        return null;
+        String result="";
+        try{
+            String st;
+            while ((st = br.readLine()) != null)
+                result += st;}
+        catch (IOException e){
+            System.out.println("File not found for buffered reader.");
+        }
+        return result;
     }
 
     @Override