diff --git a/src/FirstGUI.java b/src/FirstGUI.java
index 03cd114..4561dfe 100644
--- a/src/FirstGUI.java
+++ b/src/FirstGUI.java
@@ -6,17 +6,20 @@
 import javax.swing.JFrame;
 import javax.swing.JOptionPane;
 
-class MyJButton extends JButton implements ActionListener , Runnable {
+class MyJButton extends JButton implements ActionListener, Runnable {
     Thread thread;
-    public MyJButton(String label){
+
+    public MyJButton(String label) {
         super(label);
     }
-    public Dimension getPreferredSize(){
+
+    public Dimension getPreferredSize() {
         return new Dimension(300, 100);
     }
+
     @Override
     public void actionPerformed(ActionEvent e) {
-        if (thread == null){
+        if (thread == null) {
             thread = new Thread(this);
             thread.start();
         } else {
@@ -25,12 +28,14 @@
         FirstGUI.jf.pack();
         System.out.println(e.getActionCommand());
     }
+
     int num = 0;
+
     @Override
     public void run() {
-        while(thread != null){
+        while (thread != null) {
             num++;
-            setText("Second: "+num);
+            setText("Second: " + num);
             try {
                 Thread.sleep(1000);
             } catch (InterruptedException e) {
@@ -39,30 +44,42 @@
         }
     }
 }
+
 class MyThread extends Thread {
 
 }
 
 public class FirstGUI {
     static JFrame jf;
-    public static void main(String[] args){
+
+    public static void main(String[] args) {
         System.out.println("FirstGUI");
 
         jf = new JFrame("FirstGUI");
 
         MyJButton jb = new MyJButton("Label Label Label");
-        jb.addActionListener(jb);
-        jb.addActionListener( e -> System.out.println("Button was pressed") );
+
+        // 古い書き方
         jb.addActionListener(new ActionListener() {
             @Override
             public void actionPerformed(ActionEvent e) {
-                JOptionPane.showMessageDialog(jb,"Button was pressed.");
+                JOptionPane.showMessageDialog(jb, "Button was pressed.");
             }
         });
+        jb.addActionListener(jb);
+
+        // ラムダ式 (Java 8以降) 引数の型は自動的に推論される
+        jb.addActionListener(e -> System.out.println(e.getActionCommand() + " was pressed"));
+
+        // メソッド参照（ラムダ式をさらに簡潔にしたもの）
+        // 引数が1つで、その引数をそのままメソッドに渡す場合に使える（今回はActionEventをprintlnに送ってしまうので、すこし意味が異なる）
+        jb.addActionListener(System.out::println); 
+
         jf.getContentPane().add(jb);
-//        jf.setSize(300,200);
+        // jf.setSize(300,200);
         jf.pack();
         jf.setVisible(true);
-        jf.setDefaultCloseOperation(JFrame.DO_NOTHING_ON_CLOSE);
+        jf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
+        // jf.setDefaultCloseOperation(JFrame.DO_NOTHING_ON_CLOSE);
     }
 }
diff --git a/src/mypackage/TransparentWindowTest.java b/src/mypackage/TransparentWindowTest.java
new file mode 100644
index 0000000..38867e6
--- /dev/null
+++ b/src/mypackage/TransparentWindowTest.java
@@ -0,0 +1,91 @@
+package mypackage;
+
+import java.awt.Color;
+import java.awt.Dimension;
+import java.awt.Graphics;
+import java.awt.Image;
+import java.awt.Point;
+import java.awt.event.MouseEvent;
+import java.awt.event.MouseListener;
+import java.awt.event.MouseMotionListener;
+
+import javax.swing.JWindow;
+
+public class TransparentWindowTest extends JWindow implements MouseListener, MouseMotionListener {
+    Image buf;
+    Graphics gra;
+    public TransparentWindowTest(){
+        addMouseListener(this);
+        addMouseMotionListener(this);
+    }
+    // public void init(){
+    // }
+    public Dimension getPreferredSize(){
+        return new Dimension(300,200);
+    }
+    public void paint(Graphics g){
+        if (buf == null) {
+            Dimension d = getSize();
+            buf = createImage(d.width, d.height);
+        }
+        Dimension r = getSize();
+        gra = buf.getGraphics();
+        gra.setColor(new Color(0,0,0,0));
+        gra.fillRect(0,0,r.width,r.height);
+        // super.paint(g);
+        gra.setColor(Color.black);
+        gra.drawString(getLocation().toString(), 100, 100);
+        gra.drawRect(0,0,r.width-1,r.height-1);
+        g.drawImage(buf,0,0,this);
+    }
+    @Override
+    public void mouseClicked(MouseEvent e) {
+        System.exit(0);
+        
+    }
+    Point pressP, pressLoc;
+    int diffx, diffy;
+    @Override
+    public void mousePressed(MouseEvent e) {
+        pressP = e.getLocationOnScreen();
+        pressLoc = getLocationOnScreen();
+        diffx = pressP.x - pressLoc.x;
+        diffy = pressP.y - pressLoc.y;
+    }
+    @Override
+    public void mouseReleased(MouseEvent e) {
+        // TODO Auto-generated method stub
+        
+    }
+    @Override
+    public void mouseEntered(MouseEvent e) {
+        // TODO Auto-generated method stub
+        
+    }
+    @Override
+    public void mouseExited(MouseEvent e) {
+        // TODO Auto-generated method stub
+        
+    }
+    @Override
+    public void mouseDragged(MouseEvent e) {
+        Point nowP = e.getLocationOnScreen();
+        System.out.println(nowP);
+            setLocation(nowP.x - diffx, nowP.y - diffy);
+repaint();
+        
+    }
+    @Override
+    public void mouseMoved(MouseEvent e) {
+        // TODO Auto-generated method stub
+        
+    }
+    public static void main(String[] args) {
+
+        TransparentWindowTest tw = new TransparentWindowTest();
+        tw.setSize(300,200);
+        tw.setBackground(new Color(100,0,0,0));
+        tw.setVisible(true);
+        // tw.init();
+    }
+}