From fe9f17b4c0c7590a8aac04f38c69b145ba66817e Mon Sep 17 00:00:00 2001
From: 13766800364 <13766800364@qq.com>
Date: Thu, 9 Oct 2025 16:11:16 +0800
Subject: [PATCH] Add File

---
 .../drinkjava2/frog/objects/Material.java     | 41 +++++++++++++++++++
 1 file changed, 41 insertions(+)
 create mode 100644 history/005_letter_test/src/main/java/com/github/drinkjava2/frog/objects/Material.java

diff --git a/history/005_letter_test/src/main/java/com/github/drinkjava2/frog/objects/Material.java b/history/005_letter_test/src/main/java/com/github/drinkjava2/frog/objects/Material.java
new file mode 100644
index 0000000..584361f
--- /dev/null
+++ b/history/005_letter_test/src/main/java/com/github/drinkjava2/frog/objects/Material.java
@@ -0,0 +1,41 @@
+/* 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.github.drinkjava2.frog.objects;
+
+import java.awt.Color;
+
+/**
+ * Object means some thing in Env
+ * 
+ * 用不同的数字常量代表虚拟环境中不同的组成材料，0为空，小于10的不可见，大于20的将杀死在同一位置出现的青蛙,例如砖头和青蛙不可以重叠出现在同一位置
+ * 
+ * @author Yong Zhu
+ * @since 1.0
+ */
+public class Material {
+	public static final byte NO = 0; // nothing
+	public static final byte SEESAW_BASE = 1; // 1~9 is invisible to frog
+
+	public static final byte VISIBLE = 10; // if>=10 will visible to frog
+	public static final byte FOOD = VISIBLE + 1;
+	public static final byte SEESAW = VISIBLE + 2;
+
+	public static final byte KILLFROG = 20; // if>=20 will kill frog
+	public static final byte BRICK = KILLFROG + 1;// brick will kill frog
+	public static final byte TRAP = KILLFROG + 2; // trap will kill frog
+
+	public static Color color(byte material) {
+		if (material == TRAP)
+			return Color.LIGHT_GRAY;
+		else
+			return Color.BLACK;
+	}
+}