Start writing UI

sll/src/main/java/com/tabrizu/ds/App.java

@@ -1,27 +1,83 @@
 package com.tabrizu.ds;
+import java.util.Scanner;
+public class App {
+    ISingleLinkedList<Task> m_unfinished;
+    ISingleLinkedList<Task> m_finished;
 
-/**
- * Hello world!
- */
-public final class App {
-    public static void main(String[] args) {
-        System.out.println("Hello World!");
-        SingleLinkedList<Integer> list = new SingleLinkedList<Integer>();
-        System.out.println("Step 0: " + list);
-        list.addLast(55);
-        list.addLast(76);
-        list.addLast(35);
-        list.addFirst(22);
-        System.out.println("Step 1: " + list);
-        System.out.println("[Remove]: " + list.removeLast());
-        System.out.println("Step 2: " + list);
-        list.addFirst(78);
-        list.addLast(88);
-        System.out.println("Step 3: " + list);
-        System.out.println("[Remove]: " + list.removeFirst());
-        System.out.println("Step 4: " + list);
-        System.out.println("First: " + list.getFirst());
-        System.out.println("Last: " + list.getLast());
+    public void userInterface(){
+        Scanner sc = new Scanner(System.in);
+        while (true){
+            int menuOption;
+            menuOption = mainMenu();
+            if(menuOption == 7){
+                break;
+            }
+            switch (menuOption) {
+                case 1:
+                    System.out.println("What is the title of the task? ");
+                    String taskTitle = sc.next();
+                    Task task = new Task(taskTitle);
+                    addTask(task, true);
+                    break;
+                default:
+                    System.out.println("DEFAULT");
+                    break;
+            }
+
+        }
 
     }
+    public int mainMenu(){
+        int command;
+        Scanner scanner = new Scanner(System.in);
+        System.out.println(
+            "Task Manager App:\n" +
+            "\t 1. Add new normal task.\n" +
+            "\t 2. Add new important task.\n" +
+            "\t 3. Get the list of available tasks.\n" +
+            "\t 4. Get current task.\n" +
+            "\t 5. Change current task's status to DONE.\n" +
+            "\t 6. Get the list of finished tasks.\n" +
+            "\t 7. Quit"
+        );
+        System.out.print("What is your command? [1-7]: ");
+        command = scanner.nextInt();
+//        command++;
+        System.out.println(command);
+        return command;
+    }
+
+    public App() {
+        m_unfinished = ISingleLinkedList.create();
+        m_finished = ISingleLinkedList.create();
+    }
+    public static void main(String[] Args) {
+        App app = new App();
+        app.userInterface();
+    }
+
+    public void addTask(Task task, boolean isNormalTask){
+        if(isNormalTask){
+            m_unfinished.addLast(task);
+        }
+        else{
+            m_unfinished.addFirst(task);
+        }
+    }
+
+    public Task getCurrentTasks(){
+        return m_unfinished.getFirst();
+    }
+
+    public void taskDone(){
+        m_finished.addFirst(m_unfinished.removeFirst());
+    }
+
+    public String showFinishedTasks(){
+        return m_finished.toString();
+    }
+
+    public String showUnFinishedTasks(){
+        return m_unfinished.toString();
+    }
 }

sll/src/main/java/com/tabrizu/ds/ISingleLinkedList.java

@@ -9,4 +9,7 @@ public interface ISingleLinkedList<T> {
     public T removeLast();
     public T getFirst();
     public T getLast();
+    public static <T> ISingleLinkedList<T> create(){
+        return new SingleLinkedList<T>();
+    }
 }

sll/src/main/java/com/tabrizu/ds/Task.java

@@ -0,0 +1,13 @@
+package com.tabrizu.ds;
+
+public class Task {
+    String m_title;
+
+    public Task(String title){
+        m_title = title;
+    }
+
+    public String getTitle(){
+        return m_title;
+    }
+}