Add oving0

src/main/java/oving0/HelloWorld.java

@@ -0,0 +1,16 @@
+package oving0;
+
+public class HelloWorld {
+
+    public String getHelloWorld() {
+        return "Hello World!";
+    }
+
+    public int getHelloWorldLength() {
+        return this.getHelloWorld().length();
+    }
+
+    public static void main(String[] args) {
+        System.out.println(new HelloWorld().getHelloWorld());
+    }
+}