All Passing

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

@@ -11,10 +11,15 @@ public class AlphaCharDocument extends Document {
     }
 
     @Override
-    public void write(String contentToBeWritten) {
+    public void write(String contentToBeWritten) throws IOException{
+        if (!isAlpha(contentToBeWritten)){
+            throw new IllegalArgumentException("Not all letters");
+        } else {
+            super.write(contentToBeWritten);
+        }
     }
 
     private Boolean isAlpha(String s) {
-        return null;
+        return (s.matches("^[A-Za-z\\s]+$"));
     }
 }

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

@@ -86,11 +86,18 @@ public class Document implements DocumentInterface {
     }
 
     @Override
-    public void replaceAll(String stringToReplace, String replacementString) {
+    public void replaceAll(String stringToReplace, String replacementString) throws IOException {
+        write(
+            read()
+            .replaceAll(stringToReplace, replacementString)
+        );
     }
 
     @Override
-    public void overWrite(String content) {
+    public void overWrite(String content) throws IOException {
+        FileWriter overWriter = new FileWriter(file, false);
+        overWriter.write(content);
+        overWriter.flush();
     }
 
     public List<String> toList() {
@@ -99,11 +106,12 @@ public class Document implements DocumentInterface {
 
     @Override
     public File getFile() {
-        return null;
+        return file;
     }
 
     @Override
     public String toString() {
-        return null;
+        StringBuilder builder = new StringBuilder();
+        return builder.append(file.toString() + "{" +read()).toString() + "}";
     }
 }

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

@@ -16,9 +16,9 @@ public interface DocumentInterface {
 
     String read();
 
-    void replaceAll(String stringToReplace, String replacementString);
+    void replaceAll(String stringToReplace, String replacementString) throws IOException;
 
-    void overWrite(String content);
+    void overWrite(String content) throws IOException;
 
     List<String> toList();
 

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

@@ -11,10 +11,17 @@ public class NumericCharDocument extends Document {
     }
 
     @Override
-    public void write(String contentToBeWritten) {
+    public void write(String contentToBeWritten) throws IOException {
+            if (!isNumeric(contentToBeWritten)){
+                throw new IllegalArgumentException("Not all numbers");
+            } else {
+                super.write(contentToBeWritten);
+            }
+
     }
 
     private Boolean isNumeric(String s) {
-        return null;
+        return (s.matches("\\d+"));
     }
 }
+

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

@@ -11,10 +11,15 @@ public class SpecialCharDocument extends Document {
     }
 
     @Override
-    public void write(String contentToBeWritten) {
+    public void write(String contentToBeWritten) throws IOException{
+        if (isSpecialCharacters(contentToBeWritten)){
+            throw new IllegalArgumentException("Not all numbers");
+        } else {
+            super.write(contentToBeWritten);
+        }
     }
 
     private Boolean isSpecialCharacters(String s) {
-        return null;
+        return (s.matches("^[a-zA-Z 0-9]+$"));
     }
 }