diff --git a/history/016b_twoinput_unfinish/src/main/java/com/gitee/drinkjava2/frog/objects/Material.java b/history/016b_twoinput_unfinish/src/main/java/com/gitee/drinkjava2/frog/objects/Material.java
new file mode 100644
index 0000000..2e1931d
--- /dev/null
+++ b/history/016b_twoinput_unfinish/src/main/java/com/gitee/drinkjava2/frog/objects/Material.java
@@ -0,0 +1,50 @@
+/* Copyright 2018-2020 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may not
+ * use this file except in compliance with the License. You may obtain a copy of
+ * the License at http://www.apache.org/licenses/LICENSE-2.0 Unless required by
+ * applicable law or agreed to in writing, software distributed under the
+ * License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS
+ * OF ANY KIND, either express or implied. See the License for the specific
+ * language governing permissions and limitations under the License.
+ */
+package com.gitee.drinkjava2.frog.objects;
+
+import java.awt.Color;
+
+/**
+ * Material store material types
+ * 
+ * 虚拟环境中每个点由一个int代表，多个材料可以同时出现在同一个点，每种材料用int中的一个bit位来表示，
+ * 小于等于16384的位数用来标记青蛙序号，可利用Env.frogs.get(no-1)获取青蛙对象，其它各种材料用整数中其它位来表示
+ * 
+ * @author Yong Zhu
+ * @since 1.0
+ */
+public class Material {// NOSONAR
+
+    public static final int FROG_TAG = 0b11111111111111; // 16383 小于等于16384的位数用来标记青蛙序号，可利用Env.frogs.get(no-1)快速定位青蛙
+
+    private static int material = FROG_TAG + 1; // 大于16384用来作为各种材料的标记
+
+    public static final int FOOD = nextMaterial();
+    public static final int SNAKE = nextMaterial(); // 蛇的图形
+    public static final int KILL_ANIMAL = nextMaterial(); // if>=KILLFROG will kill animal
+    public static final int BRICK = nextMaterial();// brick will kill frog
+    public static final int TRAP = nextMaterial(); // trap will kill frog
+
+    private static int nextMaterial() {// 每次将material左移1位
+        material = material << 1;
+        if (material < 0)
+            throw new IllegalArgumentException("Material out of maximum range");
+        return material;
+    }
+
+    public static Color color(int material) {
+        if ((material & TRAP) > 0)
+            return Color.LIGHT_GRAY;
+        else
+            return Color.BLACK;
+    }
+
+}