diff --git a/src/designpattern/SingletonTest.java b/src/designpattern/SingletonTest.java
new file mode 100644
index 0000000..da3e200
--- /dev/null
+++ b/src/designpattern/SingletonTest.java
@@ -0,0 +1,38 @@
+package designpattern;
+
+import java.awt.Desktop;
+
+public class SingletonTest {
+    public static void main(String[] args) {
+        Desktop desk = Desktop.getDesktop();
+        MySetting ins = MySetting.getInstance();
+        System.out.println(ins.getCount());
+
+        try {
+            // desk.open(new File(System.getProperty("user.dir")));
+            // desk.browse(new URI("https://git.istlab.info"));
+        } catch (Exception e) {
+            e.printStackTrace();
+        }    
+    }
+}
+
+class MySetting {
+    private static MySetting instance;
+    private MySetting(){        
+    }
+    private int count = 0;
+    public static MySetting getInstance(){
+        if (instance == null) {
+            instance = new MySetting();
+        }
+        instance.count++;
+        return instance;
+    }
+    public int getCount(){ //getter
+        return count;
+    }
+    public void setCount(int c){ //setter
+
+    }
+}
\ No newline at end of file