diff --git a/.vscode/launch.json b/.vscode/launch.json
index 45336c5..2a70d79 100644
--- a/.vscode/launch.json
+++ b/.vscode/launch.json
@@ -6,6 +6,20 @@
     "configurations": [
         {
             "type": "java",
+            "name": "SecondGUI2026",
+            "request": "launch",
+            "mainClass": "SecondGUI2026",
+            "projectName": "ASD2024_84d436a2"
+        },
+        {
+            "type": "java",
+            "name": "IntListTest",
+            "request": "launch",
+            "mainClass": "IntListTest",
+            "projectName": "ASD2024_84d436a2"
+        },
+        {
+            "type": "java",
             "name": "FirstGUI2026",
             "request": "launch",
             "mainClass": "FirstGUI2026",
diff --git a/FirstGUI2026.java b/FirstGUI2026.java
index 01f75bb..911808e 100644
--- a/FirstGUI2026.java
+++ b/FirstGUI2026.java
@@ -2,10 +2,15 @@
 
 import javax.swing.JButton;
 import javax.swing.JFrame;
+//import java.lang.*;
+import javax.swing.JOptionPane;
 
-public class FirstGUI2026 implements java.awt.event.ActionListener {
+public class FirstGUI2026 implements java.awt.event.ActionListener, Runnable {
     JFrame frame;
     JButton button2;
+    int sec = 10;
+    Thread thread;
+    JButton timerButton;
     public FirstGUI2026() {
         frame = new JFrame("First GUI 2026");
         frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
@@ -18,6 +23,18 @@
         button2 = new MyButton("Java");
         button2.addActionListener(this);
         frame.getContentPane().add(button2);
+        timerButton = new JButton("Timer: " + sec);
+        frame.getContentPane().add(timerButton);
+        timerButton.addActionListener(e -> { thread = new Thread(FirstGUI2026.this) ; thread.start(); });
+        timerButton.addActionListener(System.out::println);
+        // timerButton.addActionListener(new ActionListener(){
+        //     public void actionPerformed(ActionEvent e){
+        //         thread = new Thread(FirstGUI2026.this);
+        //         thread.start();               
+        //     }
+        // });
+
+
     }
     public void actionPerformed(java.awt.event.ActionEvent e) {
         System.out.println(e.getActionCommand()+" button clicked!");
@@ -28,6 +45,22 @@
     public static void main(String[] args) {
         new FirstGUI2026();
     }
+    @Override
+    public void run() {
+        while (sec > 0) {
+            try {
+                Thread.sleep(1000);
+            } catch (InterruptedException e) {
+                e.printStackTrace();
+            }
+            sec--;
+            timerButton.setText("Timer: " + sec);
+        }
+        JOptionPane.showMessageDialog(frame, "Time's up!"); 
+        thread = null;
+        sec = 10;
+        timerButton.setText("Timer: " + sec);
+    }
 }
 
 // class MyButton extends JButton {
diff --git a/IntListTest.java b/IntListTest.java
new file mode 100644
index 0000000..fd08ae6
--- /dev/null
+++ b/IntListTest.java
@@ -0,0 +1,82 @@
+import java.util.ArrayList;
+import java.util.Scanner;
+
+public class IntListTest {
+
+	public static void main(String[] args) {
+		new IntListTest();
+	}
+
+	Scanner scan;
+	IntListTest(){
+		scan = new Scanner(System.in);
+		AvgIL intlist = new AvgIL();
+		System.out.println("Input integer or n|sum|avg|list|exit");
+		while(true) {
+			String in = scan.next();
+			if ( in.equals("exit") ) {
+				System.exit(0);
+			} else if ( in.equals("list") ) {
+				intlist.show();
+			} else if ( in.equals("n") ) {
+				System.out.println("n="+intlist.size());
+			} else if ( in.equals("sum") ) {
+				System.out.println("sum="+intlist.getSum());
+			} else if ( in.equals("avg") ) {
+				System.out.println("avg="+intlist.getAvg());
+			} else if ( in.matches("[0-9]+") ){ // Int value
+				int num = Integer.parseInt(in);
+				intlist.add(num);
+//				System.out.println("sum="+intlist.getSum()+" avg="+intlist.getAvg()+" n="+intlist.size());
+			}
+		}
+	}
+}
+
+class IntList {
+	protected ArrayList<Integer> intlist; // storage of int values
+	IntList(){
+		intlist = new ArrayList<Integer>();
+	}
+	public void add(int n) {
+		intlist.add(n);
+	}
+	public int size() {
+		return intlist.size();
+	}	
+	public void show() {
+		for(int k: intlist) {
+				System.out.print(k+" ");
+		}
+		System.out.println("");
+	}
+}
+
+class SumIL extends IntList {
+	private float sum = 0;
+
+	public void add(int n) {
+		super.add(n);
+		// update sum
+		sum = 0;
+		for(int k: intlist) {
+			sum += k;
+		}
+	}
+	public float getSum() {
+		return sum;
+	}
+}
+
+class AvgIL extends SumIL {
+	private float avg = 0;
+
+	public void add(int n) {
+		super.add(n);
+		// update avg
+		avg = getSum() / (float)size(); 
+	}
+	public float getAvg() {
+		return avg;
+	}
+}
\ No newline at end of file
diff --git a/SecondGUI2026.java b/SecondGUI2026.java
new file mode 100644
index 0000000..54d9cb5
--- /dev/null
+++ b/SecondGUI2026.java
@@ -0,0 +1,22 @@
+import javax.swing.JButton;
+import javax.swing.JFrame;
+
+public class SecondGUI2026 extends JFrame {
+    public SecondGUI2026() {
+        setTitle("Second GUI 2026");
+        setSize(400, 300);
+        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
+        setVisible(true);
+
+        JButton button = new JButton("Click Me");
+        add(button, java.awt.BorderLayout.CENTER);
+        JButton button2 = new JButton(" North");
+        add(button2, java.awt.BorderLayout.NORTH);
+        button.addActionListener(e -> System.out.println("Button clicked!"));
+        button2.addActionListener(e -> System.out.println("Button 2 clicked!"));
+    }
+
+    public static void main(String[] args) {
+        new SecondGUI2026();
+    }
+}