ADD file via upload

src.java

@@ -0,0 +1,14 @@
+public class DO {
+    public void method1() {
+        System.out.println("method1");
+    }
+    public void method2() {
+
+        System.out.println("method2");
+    }
+    public void method3() {
+
+        System.out.println("method3");
+    }
+
+}