From 3ffd9370c8c7ebf34232ef59568981cdc3856a05 Mon Sep 17 00:00:00 2001
From: Kamal Wickramanayake <kamal@inbox.lk>
Date: Sun, 22 Mar 2026 15:53:39 +0530
Subject: Added InMemoryTaskManager

---
 .../src/main/java/lk/ac/pdn/ceit/tasks/App.java    |  4 +-
 .../lk/ac/pdn/ceit/tasks/InMemoryTaskManager.java  | 51 ++++++++++++++++++++++
 .../main/java/lk/ac/pdn/ceit/tasks/ui/TextUI.java  |  2 +-
 3 files changed, 55 insertions(+), 2 deletions(-)
 create mode 100644 oop/10-task-tracker/src/main/java/lk/ac/pdn/ceit/tasks/InMemoryTaskManager.java

diff --git a/oop/10-task-tracker/src/main/java/lk/ac/pdn/ceit/tasks/App.java b/oop/10-task-tracker/src/main/java/lk/ac/pdn/ceit/tasks/App.java
index bb0ab24..8707f19 100644
--- a/oop/10-task-tracker/src/main/java/lk/ac/pdn/ceit/tasks/App.java
+++ b/oop/10-task-tracker/src/main/java/lk/ac/pdn/ceit/tasks/App.java
@@ -7,8 +7,10 @@ import lk.ac.pdn.ceit.tasks.ui.TextUI;
  */
 public class App {
     public static void main(String[] args) {
+        TaskManager taskManager = new InMemoryTaskManager();
+
         TextUI ui = new TextUI();
-        // ui.setTaskManager();
+        ui.setTaskManager(taskManager);
 
         ui.start();
     }   
diff --git a/oop/10-task-tracker/src/main/java/lk/ac/pdn/ceit/tasks/InMemoryTaskManager.java b/oop/10-task-tracker/src/main/java/lk/ac/pdn/ceit/tasks/InMemoryTaskManager.java
new file mode 100644
index 0000000..93988a3
--- /dev/null
+++ b/oop/10-task-tracker/src/main/java/lk/ac/pdn/ceit/tasks/InMemoryTaskManager.java
@@ -0,0 +1,51 @@
+package lk.ac.pdn.ceit.tasks;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import lk.ac.pdn.ceit.tasks.entities.Task;
+
+public class InMemoryTaskManager implements TaskManager {
+    private List<Task> tasks = new ArrayList<>();
+
+    private int lastId = 0;
+
+    @Override
+    public Task createNewTask(String title, String description) {
+        lastId++;
+
+        Task task = new Task(lastId, title, description);
+
+        // Add to the internally maintained task list
+        tasks.add(task);
+
+        return task;
+    }
+
+    @Override
+    public Task findById(int id) {
+        for (Task task : tasks) {
+            if (task.getId() == id) {
+                return task;
+            }
+        }
+
+        return null;
+    }
+
+    @Override
+    public void updateTask(Task task) {
+        // Find the internal position of the task in the tasks list
+        int index = 0;
+
+        for(; index < tasks.size(); index++) {
+            if (tasks.get(index).getId() == task.getId()) {
+                break;
+            }
+        }
+
+        // Replace the task object (related to that internal position)
+        tasks.set(index, task);
+    }
+
+}
diff --git a/oop/10-task-tracker/src/main/java/lk/ac/pdn/ceit/tasks/ui/TextUI.java b/oop/10-task-tracker/src/main/java/lk/ac/pdn/ceit/tasks/ui/TextUI.java
index 6bce661..d839da8 100644
--- a/oop/10-task-tracker/src/main/java/lk/ac/pdn/ceit/tasks/ui/TextUI.java
+++ b/oop/10-task-tracker/src/main/java/lk/ac/pdn/ceit/tasks/ui/TextUI.java
@@ -41,7 +41,7 @@ public class TextUI {
 
         Task newTask = taskManager.createNewTask(title, description);
 
-        IO.print("New task created: " + newTask);
+        IO.println("New task created: " + newTask);
     }
     
     private void updateTask() {
-- 
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