diff --git a/src/com/pomodoro/logic/TaskManager.java b/src/com/pomodoro/logic/TaskManager.java
index 6c9752f..b7e6ede 100644
--- a/src/com/pomodoro/logic/TaskManager.java
+++ b/src/com/pomodoro/logic/TaskManager.java
@@ -5,6 +5,7 @@
 
 import java.util.ArrayList;
 import java.util.Collections;
+import java.util.Comparator;
 import java.util.List;
 
 public class TaskManager {
@@ -56,16 +57,20 @@ public void addCategory(Category c) {
         categories.add(c);
     }
 
+    // Add Sort. Don't have DB , ExportFile
     public void sortByName() {
         // เขียนเพิ่ม
+        tasks.sort(Comparator.comparing(Task::getTitle));
     }
 
     public void sortByPriority() {
         // เขียนเพิ่ม
+        tasks.sort(Comparator.comparing(Task::getPriority));
     }
 
     public void sortByDueDate() {
         // เขียนเพิ่ม
+        tasks.sort(Comparator.comparing(Task::getDueDate));
     }
 
     public boolean exportAllToFile(String filepath) {