add Tests

demo1/src/test/java/cn/freemud/demo/IOTests.java

+package cn.freemud.demo;
+
+import org.junit.Test;
+
+public class IOTests {
+
+    @Test
+    public void Test(){
+
+    }
+}

demo1/src/test/java/cn/freemud/demo/MapTests.java

+package cn.freemud.demo;
+
+import cn.freemud.demo.po.User;
+import com.alibaba.fastjson.JSON;
+import com.google.common.collect.Maps;
+import org.junit.Assert;
+import org.junit.Test;
+
+import java.util.HashMap;
+import java.util.LinkedHashMap;
+
+public class MapTests {
+
+    @Test
+    public void Test() {
+
+        //HashMap 无序排列 效率较高
+        HashMap<String,User> userHashMap = Maps.newHashMap();
+        User user1 = new User(1L,"张三");
+        User user2 = new User(2L,"李四");
+        User user3 = new User(3L,"王五");
+        userHashMap.put("xxx",user1);
+        userHashMap.put("aaa",user2);
+        userHashMap.put("sss",user3);
+        Assert.assertTrue("张三".equals(userHashMap.get("xxx").getUsername()));
+        //重复键值不能重复添加，只能后者覆盖前者
+        userHashMap.put("xxx",user2);
+        System.out.println(userHashMap.get("xxx").getUsername());
+        Assert.assertTrue("李四".equals(userHashMap.get("xxx").getUsername()));
+
+        System.out.println(userHashMap);
+
+        //LinkedHashMap 自动排序 效率较低
+        LinkedHashMap<String,User> userLinkedHashMap = Maps.newLinkedHashMap();
+
+        userLinkedHashMap.put("xxx",user1);
+        userLinkedHashMap.put("aaa",user2);
+        userLinkedHashMap.put("sss",user3);
+
+        Assert.assertTrue("张三".equals(userLinkedHashMap.get("xxx").getUsername()));
+        System.out.println(userLinkedHashMap);
+        Assert.assertEquals(JSON.toJSONString(userLinkedHashMap),"{\"xxx\":{\"id\":1,\"username\":\"张三\"},\"aaa\":{\"id\":2,\"username\":\"李四\"},\"sss\":{\"id\":3,\"username\":\"王五\"}}");
+
+
+    }
+}