diff --git a/history/001_first_version/src/main/java/com/github/drinkjava2/frog/util/EggTool.java b/history/001_first_version/src/main/java/com/github/drinkjava2/frog/util/EggTool.java
new file mode 100644
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+++ b/history/001_first_version/src/main/java/com/github/drinkjava2/frog/util/EggTool.java
@@ -0,0 +1,127 @@
+/*
+ * Copyright 2018 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.util;
+
+import java.io.FileInputStream;
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.io.ObjectInputStream;
+import java.io.ObjectOutputStream;
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.Comparator;
+import java.util.List;
+
+import com.github.drinkjava2.frog.Frog;
+import com.github.drinkjava2.frog.egg.Egg;
+import com.github.drinkjava2.frog.env.Application;
+import com.github.drinkjava2.frog.env.Env;
+
+/**
+ * Egg is the static structure description of frog, can save as text file, to
+ * build a frog, first need build a egg.
+ */
+public class EggTool {
+
+	public static final boolean JSON_FILE_FORMAT = false; // JSON is slow but easier to debug
+
+	/**
+	 * 利用Java串行机制存盘。 能量多(也就是吃的更多，更fat)的Frog下蛋并存盘, 以进行下一伦测试，能量少的Frog被淘汰，没有下蛋的资格。
+	 */
+	public static void layEggs(Env env) {
+		sortFrogsOrderByEnergyDesc(env);
+		System.out.print("First frog energy=" + env.frogs.get(0).energy);
+		System.out.print(",  Last frog energy=" + env.frogs.get(env.frogs.size() - 1).energy + ",  ");
+		for (Frog frog : env.frogs) {
+			System.out.print(frog.energy + ",");
+		}
+		System.out.println();
+		try {
+			List<Egg> newEggs = new ArrayList<Egg>();
+			for (int i = 0; i < env.EGG_QTY; i++)
+				newEggs.add(env.frogs.get(i).layEgg());
+
+			if (JSON_FILE_FORMAT) {
+//				String newEggsString = JSON.toJSONString(newEggs);
+//				FrogFileUtils.writeFile(Application.CLASSPATH + "eggs.json", newEggsString, "utf-8");
+			} else {
+				FileOutputStream fo = new FileOutputStream(Application.CLASSPATH + "eggs.ser");
+				ObjectOutputStream so = new ObjectOutputStream(fo);
+				so.writeObject(newEggs);
+				so.close();
+			}
+			env.eggs = newEggs;
+			System.out
+					.println("Saved " + env.eggs.size() + " eggs to file '" + Application.CLASSPATH + "eggs.ser" + "'");
+		} catch (IOException e) {
+			System.out.println(e);
+		}
+	}
+
+	private static void sortFrogsOrderByEnergyDesc(Env env) {
+		Collections.sort(env.frogs, new Comparator<Frog>() {
+			public int compare(Frog a, Frog b) {
+				if (a.energy > b.energy)
+					return -1;
+				else if (a.energy == b.energy)
+					return 0;
+				else
+					return 1;
+			}
+		});
+	}
+
+	/**
+	 * 从磁盘读入一批Egg
+	 */
+	@SuppressWarnings("unchecked")
+	public static void loadEggs(Env env) {
+		boolean errorfound = false;
+		if (JSON_FILE_FORMAT) {
+//			String eggsString = FrogFileUtils.readFile(Application.CLASSPATH + "eggs.json", "utf-8");
+//			if (eggsString != null) {
+//				List<JSONObject> jsonEggs = (List<JSONObject>) JSON.parse(eggsString);
+//				env.eggs = new ArrayList<Egg>();
+//				for (JSONObject json : jsonEggs) {
+//					Egg egg = json.toJavaObject(Egg.class);
+//					env.eggs.add(egg);
+//				}
+//				System.out.println(
+//						"Loaded " + env.eggs.size() + " eggs from file '" + Application.CLASSPATH + "eggs.json" + "'.");
+//			} else
+//				errorfound = true;
+		} else {
+			try {
+				FileInputStream eggsFile = new FileInputStream(Application.CLASSPATH + "eggs.ser");
+				ObjectInputStream eggsInputStream = new ObjectInputStream(eggsFile);
+				env.eggs = (List<Egg>) eggsInputStream.readObject();
+				System.out.println(
+						"Loaded " + env.eggs.size() + " eggs from file '" + Application.CLASSPATH + "eggs.ser" + "'.");
+				eggsInputStream.close();
+			} catch (Exception e) {
+				errorfound = true; 
+			}
+		}
+		if (errorfound) {
+			System.out.println("No eggs files ' " + Application.CLASSPATH + " found, created " + env.EGG_QTY
+					+ " new eggs to do test.");
+			env.eggs = new ArrayList<Egg>();
+			for (int i = 0; i < env.EGG_QTY; i++)
+				env.eggs.add(Egg.createBrandNewEgg());
+		}
+	}
+	
+	public static void deleteEggs() {
+		System.out.println("Delete exist egg file: '" + Application.CLASSPATH + "eggs.ser'");
+		FrogFileUtils.deleteFile(Application.CLASSPATH + "eggs.ser");
+	}
+
+}