add s m

+package com.yohoufo.order.stateMachine;
+
+/**
+ * Created by chao.chen on 2019/1/3.
+ */
+public interface Func<R> {
+    R call();
+}

+package com.yohoufo.order.stateMachine;
+
+/**
+ * Created by chao.chen on 2019/1/3.
+ */
+public class StateMachine<S, T> {
+
+    protected final Func<S> stateAccessor;
+
+
+    public StateMachine(){
+        stateAccessor = new Func<S>() {
+            @Override
+            public S call() {
+                return null;
+            }
+        };
+    }
+
+}