completed Alpha,Numeric,and SC classes

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

@@ -12,9 +12,15 @@ public class AlphaCharDocument extends Document {
 
     @Override
     public void write(String contentToBeWritten) {
+        if (isAlpha(contentToBeWritten)){
+            super.write(contentToBeWritten);
+
+        }else{
+            throw new IllegalArgumentException();
+        }
     }
 
     private Boolean isAlpha(String s) {
-        return null;
+        return (s.matches("[a-zA-z ]+"));
     }
 }

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

@@ -2,6 +2,7 @@ package rocks.zipcode;
 
 import java.io.*;
 import java.nio.file.Files;
+import java.nio.file.*;
 import java.util.Arrays;
 import java.util.List;
 
@@ -24,20 +25,49 @@ public class Document implements DocumentInterface {
 
     @Override
     public void write(String contentToBeWritten) {
+        try{
+            fileWriter.write(contentToBeWritten);
+            fileWriter.flush();
+            fileWriter.close();
+
+        } catch (IOException io) {
+            io.printStackTrace();
+        }
     }
 
     @Override
     public void write(Integer lineNumber, String valueToBeWritten) {
+
+
     }
 
     @Override
-    public String read(Integer lineNumber) {
+    public String read(Integer lineNumber){
         return null;
+
     }
 
     @Override
-    public String read() {
-        return null;
+    public String read() throws IOException{
+        BufferedReader readFile = new BufferedReader(new FileReader(file));
+        String fileAsString;
+        try {
+            StringBuilder sb = new StringBuilder();
+            String fileLine = readFile.readLine();
+
+            while (fileLine != null) {
+                sb.append(fileLine);
+                sb.append(System.lineSeparator());
+                fileLine = readFile.readLine();
+            }
+            fileAsString  = sb.toString().trim();
+
+        } finally {
+            readFile.close();
+        }
+
+        return fileAsString;
+
     }
 
     @Override
@@ -54,7 +84,7 @@ public class Document implements DocumentInterface {
 
     @Override
     public File getFile() {
-        return null;
+        return file;
     }
 
     @Override

src/main/java/rocks/zipcode/DocumentInterface.java

@@ -13,7 +13,7 @@ public interface DocumentInterface {
 
     String read(Integer lineNumber);
 
-    String read();
+    String read() throws Exception;
 
     void replaceAll(String stringToReplace, String replacementString);
 

src/main/java/rocks/zipcode/NumericCharDocument.java

@@ -12,9 +12,15 @@ public class NumericCharDocument extends Document {
 
     @Override
     public void write(String contentToBeWritten) {
+        if (isNumeric(contentToBeWritten)){
+            super.write(contentToBeWritten);
+
+        }else{
+            throw new IllegalArgumentException();
+        }
     }
 
     private Boolean isNumeric(String s) {
-        return null;
+        return (s.matches("[0-9 ]+"));
     }
 }

src/main/java/rocks/zipcode/SpecialCharDocument.java

@@ -12,9 +12,15 @@ public class SpecialCharDocument extends Document {
 
     @Override
     public void write(String contentToBeWritten) {
+        if (isSpecialCharacters(contentToBeWritten)){
+            super.write(contentToBeWritten);
+
+        }else{
+            throw new IllegalArgumentException();
+        }
     }
 
     private Boolean isSpecialCharacters(String s) {
-        return null;
+        return (s.matches("[\\p{Punct}]+"));
     }
 }