diff --git a/src/j7/Test.java b/src/j7/Test.java
new file mode 100644
index 0000000..0635d24
--- /dev/null
+++ b/src/j7/Test.java
@@ -0,0 +1,22 @@
+package j7;
+
+import java.awt.event.WindowEvent;
+import java.awt.event.WindowAdapter;
+
+import javax.swing.JButton;
+import javax.swing.JFrame;
+
+public class Test extends JFrame {
+    public static void main(String[] args) {
+        Test t = new Test();
+        t.getContentPane().add(new JButton("hoge"));
+        t.addWindowListener(new WindowAdapter() {
+            @Override
+            public void windowClosing(WindowEvent e) {
+                System.exit(0);
+            }
+        });
+        t.pack();
+        t.setVisible(true);
+    }
+}