diff --git a/hb/gridtest.java b/hb/gridtest.java
new file mode 100644
index 0000000..755238a
--- /dev/null
+++ b/hb/gridtest.java
@@ -0,0 +1,29 @@
+import javax.swing.*;
+import javax.swing.event.*;
+import java.awt.*;
+import java.awt.event.*;
+
+class GridTest extends JFrame {
+    GridTest() {
+        setTitle("GridTest");
+        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
+        Container contentPane = getContentPane();
+        contentPane.setLayout(new GridLayout(4,3,5,5));
+        contentPane.add(new JButton("7"));
+        contentPane.add(new JButton("8"));
+        contentPane.add(new JButton("9"));
+        contentPane.add(new JButton("4"));
+        contentPane.add(new JButton("5"));
+        contentPane.add(new JButton("6"));
+        contentPane.add(new JButton("1"));
+        contentPane.add(new JButton("2"));
+        contentPane.add(new JButton("3"));
+        contentPane.add(new JButton("0"));
+        contentPane.add(new JButton("."));
+        setSize(250,350);
+        setVisible(true);
+    }
+    public static void main(String[] args) {
+        new GridTest();
+    }
+}
diff --git a/hb/test.java b/hb/test.java
new file mode 100644
index 0000000..7d6f4d2
--- /dev/null
+++ b/hb/test.java
@@ -0,0 +1,22 @@
+import javax.swing.*;
+import java.awt.*;
+import javax.swing.event.*;
+import java.awt.event.*;
+
+class MyFrame extends JFrame {
+    MyFrame() {
+        setTitle("테스트");
+        Container contentPane = getContentPane();
+        contentPane.setBackground(Color.CYAN);
+        contentPane.setLayout(new FlowLayout());
+        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
+        contentPane.add(new JButton("1"));
+        contentPane.add(new JButton("2"));
+        contentPane.add(new JButton("3"));
+        setSize(300,300);
+        setVisible(true);
+    }
+    public static void main(String[] args) {
+        MyFrame f = new MyFrame();
+    }
+}