update files to comply with checkstyle

build.gradle

@@ -5,6 +5,12 @@ plugins {
     id 'checkstyle'
 }
 
+java {
+    toolchain {
+        languageVersion = JavaLanguageVersion.of(11);
+    }
+}
+
 repositories {
     mavenCentral()
 }

src/main/java/duchess/Deadline.java

@@ -1,7 +1,6 @@
 package duchess;
 
 import java.time.LocalDate;
-
 import java.util.ArrayList;
 
 /**
@@ -56,7 +55,7 @@ public String mainString() {
     @Override
     public String toSaveString() {
         String saveString = String.format("D|%s|by:%s|", super.toSaveString(), this.deadline);
-        
+
         for (String tag : this.tags) {
             saveString += String.format("#%s|", tag);
         }
@@ -91,15 +90,15 @@ public static Deadline fromSaveString(String s) {
 
         for (int i = 4; i < splitString.length; i++) {
             String dataString = splitString[i];
-            
+
             if (dataString.startsWith("#")) {
                 tags.add(dataString.substring(1));
             }
         }
 
         try {
             Deadline deadline = new Deadline(name, deadlineString, taskStatus);
-            
+
             for (String tag : tags) {
                 deadline.addTag(tag);
             }

src/main/java/duchess/Duchess.java

@@ -1,20 +1,18 @@
 package duchess;
 
-import duchess.command.Command;
-import duchess.command.CommandType;
-
-import java.util.ArrayList;
 import java.util.Scanner;
 import java.util.function.Consumer;
 
+import duchess.command.Command;
+
 /**
  * The main class used to execute Duchess actions.
  */
 public class Duchess {
     /**
      * Name for the Duchess AI.
      */
-    public final String NAME = "Duchess";
+    public static final String NAME = "Duchess";
 
     /**
      * An ArrayList to store text in.
@@ -44,6 +42,7 @@ private void executeCallbackHandler(String s) {
 
     /**
      * Attempts to parse and execute the user input as a Duchess command.
+     * Afterwards, executes Duchess' set callback handler.
      *
      * @param userInput - the user's input.
      */
@@ -53,6 +52,10 @@ public void parseUserInput(String userInput) {
         this.executeCallbackHandler(output);
     }
 
+    /**
+     * Runs the CLI Duchess' main logic loop of receiving user input, and giving the appropriate
+     * response.
+     */
     public void run() {
         this.executeCallbackHandler(Ui.printGreeting());
 
@@ -83,10 +86,16 @@ public void run() {
         this.executeCallbackHandler(Ui.printFarewell());
     }
 
+    /**
+     * Saves Tasks from this Duchess instance into a save file.
+     */
     public void saveTasks() {
         Storage.saveTasksToFile(this.storedTasks);
     }
 
+    /**
+     * Loads Tasks from a specific save file into this Duchess instance.
+     */
     public void loadTasks() {
         // Create the save file, if it does not exist.
         Storage.createSaveFile();

src/main/java/duchess/DuchessException.java

@@ -1,5 +1,9 @@
 package duchess;
 
+/**
+ * A general-purpose Exception to be thrown by Duchess when an error is encountered,
+ * with a customized message.
+ */
 public class DuchessException extends Throwable {
     private String message;
 

src/main/java/duchess/DuchessGUI.java → src/main/java/duchess/DuchessGui.java

@@ -1,17 +1,17 @@
 package duchess;
 
-import java.util.ArrayList;
-import java.util.Scanner;
-
 /**
  * The main class used to execute Duchess actions.
  */
-public class DuchessGUI {
-    
+public class DuchessGui {
+
     private Duchess duchess;
     private String responseString = "";
 
-    public DuchessGUI() {
+    /**
+     * Returns a new DuchessGUI instance.
+     */
+    public DuchessGui() {
         this.duchess = new Duchess();
         this.duchess.setCallbackHandler((s) -> {
             this.responseString = s;

src/main/java/duchess/Event.java

@@ -2,6 +2,9 @@
 
 import java.util.ArrayList;
 
+/**
+ * Represents an Event Task, which is a Task with a name, start time and end time.
+ */
 public class Event extends Task {
     private String startTime;
     private String endTime;
@@ -94,14 +97,14 @@ public static Event fromSaveString(String s) {
 
         for (int i = 5; i < splitString.length; i++) {
             String dataString = splitString[i];
-            
+
             if (dataString.startsWith("#")) {
                 tags.add(dataString.substring(1));
             }
         }
 
         Event event = new Event(name, startTime, endTime, taskStatus);
-        
+
         for (String tag : tags) {
             event.addTag(tag);
         }

src/main/java/duchess/Main.java

@@ -12,20 +12,20 @@
  * A GUI for Duke using FXML.
  */
 public class Main extends Application {
-    private DuchessGUI duchessGUI = new DuchessGUI();
-    private FXMLLoader duchessGUILoader;
+    private DuchessGui duchessGui = new DuchessGui();
+    private FXMLLoader duchessGuiLoader;
 
     @Override
     public void start(Stage stage) {
         try {
-            duchessGUILoader = new FXMLLoader(Main.class.getResource("/view/Duchess.fxml"));
-            VBox vb = duchessGUILoader.load();
+            duchessGuiLoader = new FXMLLoader(Main.class.getResource("/view/Duchess.fxml"));
+            VBox vb = duchessGuiLoader.load();
 
             Scene scene = new Scene(vb);
             stage.setScene(scene);
 
-            duchessGUILoader.<MainWindowController>getController().setDuchessGUI(duchessGUI);
-            duchessGUILoader.<MainWindowController>getController().loadTasksFromFile();
+            duchessGuiLoader.<MainWindowController>getController().setDuchessGui(duchessGui);
+            duchessGuiLoader.<MainWindowController>getController().loadTasksFromFile();
 
             stage.show();
         } catch (IOException e) {
@@ -35,7 +35,7 @@ public void start(Stage stage) {
 
     @Override
     public void stop() {
-        duchessGUILoader.<MainWindowController>getController().saveTasksToFile();
+        duchessGuiLoader.<MainWindowController>getController().saveTasksToFile();
     }
 }
 

src/main/java/duchess/MainWindowController.java

@@ -2,69 +2,69 @@
 
 import javafx.application.Platform;
 import javafx.fxml.FXML;
+import javafx.scene.control.ScrollPane;
 import javafx.scene.control.TextField;
 import javafx.scene.image.Image;
-import javafx.scene.control.ScrollPane;
 import javafx.scene.layout.VBox;
 
 /**
  * Controller for MainWindow. Provides the layout for the other controls.
  */
 public class MainWindowController extends VBox {
-    private Image userImage  = new Image(this.getClass().getResourceAsStream("/images/user.png"));
+    private Image userImage = new Image(this.getClass().getResourceAsStream("/images/user.png"));
     private Image duchessImage = new Image(this.getClass().getResourceAsStream("/images/duchess.png"));
 
     @FXML
-    ScrollPane scrollPane;
+    private ScrollPane scrollPane;
 
     @FXML
-    VBox chat_vbox; 
+    private VBox chatVbox;
 
     @FXML
-    TextField userinput_textfield;
+    private TextField userinputTextfield;
 
-    private DuchessGUI duchessGUI;
+    private DuchessGui duchessGui;
 
-    public void setDuchessGUI(DuchessGUI dGUI) {
-        this.duchessGUI = dGUI;
+    public void setDuchessGui(DuchessGui dGui) {
+        this.duchessGui = dGui;
     }
 
     public void loadTasksFromFile() {
-        this.duchessGUI.loadTasks();
+        this.duchessGui.loadTasks();
     }
 
     @FXML
     private void initialize() {
-        chat_vbox.heightProperty().addListener(observable -> scrollPane.setVvalue(1D));
+        chatVbox.heightProperty().addListener(observable -> scrollPane.setVvalue(1D));
 
-        chat_vbox.getChildren().addAll(
+        chatVbox.getChildren().addAll(
                 DialogBox.getDuchessDialog(Ui.printGreeting(), duchessImage)
-                );
+        );
 
-        userinput_textfield.clear();
+        userinputTextfield.clear();
     }
 
     @FXML
     private void handleUserInput() {
-        String input = userinput_textfield.getText();
-        String response = duchessGUI.getResponse(input);
-        
+        String input = userinputTextfield.getText();
+        String response = duchessGui.getResponse(input);
+
         if (Parser.isExitCommand(input)) {
-            chat_vbox.getChildren().addAll(
+            chatVbox.getChildren().addAll(
                     DialogBox.getDuchessDialog(Ui.printFarewell(), duchessImage)
-                    );
-            userinput_textfield.clear();
+            );
+            userinputTextfield.clear();
             Platform.exit();
         }
 
-        chat_vbox.getChildren().addAll(
+        chatVbox.getChildren().addAll(
                 DialogBox.getUserDialog(input, userImage),
                 DialogBox.getDuchessDialog(response, duchessImage)
-                );
-        userinput_textfield.clear();
+        );
+        userinputTextfield.clear();
     }
 
     public void saveTasksToFile() {
-        this.duchessGUI.saveTasks();
+        this.duchessGui.saveTasks();
     }
 }

src/main/java/duchess/Parser.java

@@ -1,10 +1,10 @@
 package duchess;
 
+import java.util.regex.Matcher;
+
 import duchess.command.Command;
 import duchess.command.CommandType;
 
-import java.util.regex.Matcher;
-
 /**
  * A class used to parse user input from the command line.
  */
@@ -219,7 +219,7 @@ public static boolean isEventCommand(String s) {
     public static Event parseEventCommand(String s) throws DuchessException {
         Matcher m = Utility.parseRegex(
                 s, "^event( [A-Za-z0-9_ ]+)?( /from( [A-Za-z0-9_ ]+)?)?( /to( [A-Za-z0-9_ ]+)?)?$"
-            );
+                );
 
         if (m.group(1) == null) {
             throw new DuchessException("(´；ω；`) Sorry, event names cannot be empty... ;-;");
@@ -252,12 +252,12 @@ public static boolean isAddTagCommand(String s) {
      * @throws DuchessException   if any essential arguments to this command are missing.
      */
     public static int parseAddTagCommandIndex(String s) throws DuchessException {
-        // Matches a tag, followed by either "a" or "add", then an index 
-        // (any number of digits) and then any number of (hashtags (optional) 
-        // and then letters without spaces.) Each tag hence needs to have no spaces inside. 
+        // Matches a tag, followed by either "a" or "add", then an index
+        // (any number of digits) and then any number of (hashtags (optional)
+        // and then letters without spaces.) Each tag hence needs to have no spaces inside.
         Matcher m = Utility.parseRegex(
                 s, "^tag a(?:dd)? ([0-9]+)?((?: (?:#)?(?:[A-Za-z0-9_\\-]+))*)?"
-            );
+                );
 
         if (m.group(1) == null) {
             throw new DuchessException("(´；ω；`) Sorry, I don't know which task to tag... ;-;");
@@ -277,7 +277,7 @@ public static String[] parseAddTagCommandTags(String s) throws DuchessException
         // See parseAddTagCommandIndex.
         Matcher m = Utility.parseRegex(
                 s, "^tag a(?:dd)? ([0-9]+)?((?: (?:#)?(?:[A-Za-z0-9_\\-]+))*)?"
-            );
+                );
 
         if (m.group(1) == null || m.group(2) == null || m.group(2).length() == 0) {
             throw new DuchessException("(´；ω；`) Sorry, tags cannot be empty... ;-;");
@@ -307,11 +307,11 @@ public static boolean isRemoveTagCommand(String s) {
      */
     public static int parseRemoveTagCommandIndex(String s) throws DuchessException {
         // Matches a tag, followed by some variant of "rm" or "del", then
-        // (any number of digits) and then any number of (hashtags (optional) 
+        // (any number of digits) and then any number of (hashtags (optional)
         // and then letters without spaces.)
         Matcher m = Utility.parseRegex(
                 s, "^tag (?:rm|remove|del|delete) ([0-9]+)?((?: (?:#)?(?:[A-Za-z0-9_\\-]+))*)?"
-            );
+                );
 
         if (m.group(1) == null) {
             throw new DuchessException("(´；ω；`) Sorry, I don't know which task to remove the tag from... ;-;");
@@ -331,7 +331,7 @@ public static String[] parseRemoveTagCommandTags(String s) throws DuchessExcepti
         // See parseRemoveTagCommandIndex.
         Matcher m = Utility.parseRegex(
                 s, "^tag (?:rm|remove|del|delete) ([0-9]+)?((?: (?:#)?(?:[A-Za-z0-9_\\-]+))*)?"
-            );
+                );
 
         if (m.group(1) == null || m.group(2) == null || m.group(2).length() == 0) {
             throw new DuchessException("(´；ω；`) Sorry, tags cannot be empty... ;-;");