done

Crypto/src/ROT13.java

+import com.sun.xml.internal.fastinfoset.util.CharArray;
+
 import static java.lang.Character.isLowerCase;
 import static java.lang.Character.isUpperCase;
 import static java.lang.Character.toLowerCase;
+
+import java.io.FileNotFoundException;
+import java.util.Scanner;
+import java.io.File;
 import java.lang.StringBuilder;
 import java.lang.String;
 import java.lang.StringBuffer;
 
     public String crypt(String text) throws UnsupportedOperationException {
         StringBuilder builder = new StringBuilder();
-
-        for(int i = 0; i<text.length(); i++){
-            char c = text.charAt(i);
+        char[] charText = text.toCharArray();
+        for(char i: charText){
+            char c = i;
         if(c>='a' && c<='m' || c>='A' && c<='M') c+=13;
         else if(c>='n' && c<='z' || c>='N' && c<='Z') c-=13;
         builder.append(c);
         }
-    text = builder.toString();
 
-        return text;
+
+        return builder.toString();
     }
 
     public String encrypt(String text) {
-        for(int i = 0; i<text.length(); i++){
-            char ch = text.charAt(i);
-            if(ch>= 'A' && ch<='Z'){
-                ch = (char)(ch+13);
-                if (ch > 'Z') {
-                    ch = (char)(ch-26);
-                }
-            }
-            else if(ch>= 'a' && ch<='z'){
-                ch = (char)(ch+13);
-                if(ch>'z'){
-                    ch = (char)(ch-26);
-                }
-            }
-            cryptText = cryptText+ch;
-        }
-        text = cryptText;
-        return text;
+
+        return crypt(text);
     }
 
     public String decrypt(String text) {
-        encrypt(text);
-        return text;
+
+        return crypt(text);
     }
 
     public static String rotate(String s, Character c) {
 
     }
 
+    public String encryptFile(String filename){
+        StringBuilder builder = new StringBuilder();
+        File file = new File(filename);
+        try (Scanner scanner = new Scanner (file)){
+            while (scanner.hasNextLine()){
+                String line = scanner.nextLine();
+                String xo = this.encrypt(line);
+                builder.append(xo+"/n");
+            }
+        } catch (FileNotFoundException e){
+            e.printStackTrace();
+        }
+        return builder.toString();
+    }
 }

SimpleCrypt.iml

 <?xml version="1.0" encoding="UTF-8"?>
 <module org.jetbrains.idea.maven.project.MavenProjectsManager.isMavenModule="true" type="JAVA_MODULE" version="4">
-  <component name="NewModuleRootManager" LANGUAGE_LEVEL="JDK_1_5">
+  <component name="NewModuleRootManager" LANGUAGE_LEVEL="JDK_1_7">
     <output url="file://$MODULE_DIR$/target/classes" />
     <output-test url="file://$MODULE_DIR$/target/test-classes" />
     <content url="file://$MODULE_DIR$">
     </content>
     <orderEntry type="inheritedJdk" />
     <orderEntry type="sourceFolder" forTests="false" />
-    <orderEntry type="library" name="Maven: org.opentest4j:opentest4j:1.1.0" level="project" />
-    <orderEntry type="library" name="Maven: org.junit.platform:junit-platform-commons:1.3.0-M1" level="project" />
-    <orderEntry type="library" name="Maven: org.testng:testng:6.14.3" level="project" />
     <orderEntry type="library" name="Maven: org.junit.jupiter:junit-jupiter-api:5.3.0-M1" level="project" />
     <orderEntry type="library" name="Maven: org.apiguardian:apiguardian-api:1.0.0" level="project" />
     <orderEntry type="library" name="Maven: org.opentest4j:opentest4j:1.1.0" level="project" />

pom.xml

     <groupId>com.zipcodewilmington</groupId>
     <artifactId>SimpleCrypt</artifactId>
     <version>1.0-SNAPSHOT</version>
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-compiler-plugin</artifactId>
+                <configuration>
+                    <source>7</source>
+                    <target>7</target>
+                </configuration>
+            </plugin>
+        </plugins>
+    </build>
     <dependencies>
         <dependency>
             <groupId>org.junit.jupiter</groupId>