[Hao Yun]iP

src/main/java/Duke.java

@@ -1,10 +1,51 @@
+import java.util.Scanner;
+
 public class Duke {
+
+    private TaskManager manager = new TaskManager();
+
+    public void exit() {
+        System.out.println("------------------------------------");
+        System.out.println("Bye. Hope to see you again soon!");
+        System.out.println("------------------------------------");
+        System.out.println();
+    }
+
+    public void run() {
+        Scanner in = new Scanner(System.in);
+        String command;
+        while(in.hasNextLine()) {
+            command = in.nextLine();
+            if(command.equals("bye")) {
+                return;
+            } else if (command.equals("list")){
+                manager.listTask();
+            } else if (command.startsWith("done")){
+                manager.markTask(Integer.parseInt(command.substring(5)));
+            } else {
+                manager.addTask(command);
+            }
+        }
+    }
+
+    public void greet(){
+        System.out.println("------------------------------------");
+        System.out.println("Hello! I'm Duke");
+        System.out.println("What can I do for you?");
+        System.out.println("------------------------------------");
+        System.out.println();
+    }
+
     public static void main(String[] args) {
         String logo = " ____        _        \n"
                 + "|  _ \\ _   _| | _____ \n"
                 + "| | | | | | | |/ / _ \\\n"
                 + "| |_| | |_| |   <  __/\n"
                 + "|____/ \\__,_|_|\\_\\___|\n";
-        System.out.println("Hello from\n" + logo);
+        System.out.println("Welcome to\n" + logo);
+        Duke duke = new Duke();
+        duke.greet();
+        duke.run();
+        duke.exit();
     }
 }

src/main/java/Task.java

@@ -0,0 +1,4 @@
+public class Task {
+    String name;
+    boolean isDone;
+}

src/main/java/TaskManager.java

@@ -0,0 +1,35 @@
+public class TaskManager {
+    public static final int MAXIMUM_TASK = 100;
+    private Task[] tasks = new Task[MAXIMUM_TASK];
+    private int numOfTasks = 0;
+
+    public void addTask(String command) {
+        System.out.println("------------------------------------");
+        System.out.println("added: "+ command);
+        System.out.println("You added a new task, remember to finish it on time!");
+        System.out.println("------------------------------------");
+        System.out.println();
+        Task task = new Task();
+        task.name = command;
+        task.isDone = false;
+        tasks[numOfTasks++] = task;
+    }
+
+    public void listTask() {
+        System.out.println("------------------------------------");
+        System.out.println("Here is the list of all tasks you have:");
+        for(int i = 0; i < numOfTasks; i++) {
+            System.out.println(String.format("%d.[%c] %s", i+1,(tasks[i].isDone? '✓':'✗'), tasks[i].name));
+        }
+        System.out.println("------------------------------------");
+        System.out.println();
+    }
+
+    public void markTask(int taskNo) {
+        System.out.println("------------------------------------");
+        System.out.println("Good job! You have done this task:");
+        System.out.println("  [✓] " + tasks[taskNo-1].name);
+        System.out.println("------------------------------------");
+        tasks[taskNo-1].isDone = true;
+    }
+}