completed alpha document

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

@@ -1,37 +1,47 @@
 package rocks.zipcode;
 
 import java.io.*;
+import java.util.Scanner;
 
 /**
  * @author leon on 16/11/2018.
  */
 public class AlphaCharDocument extends Document {
 
-private FileWriter fw;
-private String fileName;
-private File file = new File(fileName);
+//private String fileName;
+private File file;
+//private FileWriter fw = new FileWriter(file);
 
     public AlphaCharDocument(String fileName) throws IOException {
         super(fileName);
-        this.fileName = fileName;
-        fw = new FileWriter(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 {
-        BufferedReader br = new BufferedReader(new FileReader(file));
         try {
-            return br.readLine();
-        } catch (IOException e) {
+            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) {
             e.printStackTrace();
         }
         return null;