diff --git a/java-base-demo/src/main/java/com/jay/extend/Employee.java b/java-base-demo/src/main/java/com/jay/extend/Employee.java
deleted file mode 100644
index 605ff23..0000000
--- a/java-base-demo/src/main/java/com/jay/extend/Employee.java
+++ /dev/null
@@ -1,33 +0,0 @@
-package com.jay.extend;
-
-/**
- * Created by xiang.wei on 2018/1/28
- *
- * @author xiang.wei
- */
-public class Employee {
-    private String name;
-    private int salary;
-
-    public String getName() {
-        return name;
-    }
-
-    public void setName(String name) {
-        this.name = name;
-    }
-
-    public int getSalary() {
-        return salary;
-    }
-
-    public void setSalary(int salary) {
-        this.salary = salary;
-    }
-
-    @Override
-    public boolean equals(Object other) {
-        return other != null
-                && getClass() == other.getClass();
-    }
-}
diff --git a/java-base-demo/src/main/java/com/jay/extend/MessageTest.java b/java-base-demo/src/main/java/com/jay/extend/MessageTest.java
new file mode 100644
index 0000000..1db05b5
--- /dev/null
+++ b/java-base-demo/src/main/java/com/jay/extend/MessageTest.java
@@ -0,0 +1,76 @@
+package com.jay.extend;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.concurrent.ForkJoinPool;
+import java.util.concurrent.RecursiveAction;
+
+
+public class MessageTest {
+    public static void main(String[] args) {
+        List<String> batchMessageList = new ArrayList<>();
+        //初始化测试数据
+        for (int i = 0; i < 110; i++) {
+            String message="消息"+i;
+            batchMessageList.add(message);
+        }
+        //1. 定义四个任务，每个任务发送25条
+        //2. 然后归并结果
+        ForkJoinPool forkJoinPool = new ForkJoinPool(5);
+        //超过100条就只发送前100条
+        if (batchMessageList.size() > 100) {
+            batchMessageList = batchMessageList.subList(0, 100);
+        }
+        long startTime = System.currentTimeMillis();
+        SendTask sendTask = new SendTask(0,batchMessageList.size(),batchMessageList);
+        forkJoinPool.invoke(sendTask);
+        System.out.println("***********消息发送总耗时="+(System.currentTimeMillis()-startTime));
+    }
+
+    //单条发送的接口
+    public static void send(String message)  {
+        try {
+            Thread.sleep(2);
+            System.out.println("***********发送了="+message);
+        } catch (InterruptedException e) {
+            e.printStackTrace();
+        }
+    }
+
+    public static void batchSend(int start, int end, List<String> messageList) {
+        for (int i = start; i < end; i++) {
+            send(messageList.get(i));
+        }
+    }
+
+    static class SendTask extends RecursiveAction {
+        private int start;
+        private int end;
+        private List<String> list;
+
+        public SendTask(int start, int end, List<String> list) {
+            this.start = start;
+            this.end = end;
+            this.list = list;
+        }
+
+        @Override
+        protected void compute() {
+            if (start > end) {
+                return;
+            }
+            if (end - start <= 20) {
+                 batchSend(start, end,list);
+            } else {
+                int mid = (start + end) / 2;
+                SendTask rightTask = new SendTask(start, mid,list);
+                SendTask leftTask = new SendTask(mid + 1, end, list);
+                invokeAll(rightTask, leftTask);
+                leftTask.join();
+                rightTask.join();
+
+            }
+
+        }
+    }
+}
diff --git a/java-base-demo/src/main/java/com/jay/extend/MessageTest2.java b/java-base-demo/src/main/java/com/jay/extend/MessageTest2.java
new file mode 100644
index 0000000..ac4d722
--- /dev/null
+++ b/java-base-demo/src/main/java/com/jay/extend/MessageTest2.java
@@ -0,0 +1,14 @@
+package com.jay.extend;
+
+/**
+ * @author xiang.wei
+ * @date 2020/6/15 10:23 PM
+ */
+public class MessageTest2 {
+
+    public static void main(String[] args) {
+
+
+    }
+
+}
diff --git a/java-base-demo/src/main/java/com/jay/extend/TripleTest2.java b/java-base-demo/src/main/java/com/jay/extend/TripleTest2.java
index fbd361f..b0c77eb 100644
--- a/java-base-demo/src/main/java/com/jay/extend/TripleTest2.java
+++ b/java-base-demo/src/main/java/com/jay/extend/TripleTest2.java
@@ -5,18 +5,18 @@
  *
  * @author xiang.wei
  */
-public class TripleTest2 {
-    public static void main(String[] args) {
-        Employee outEmployee = new Employee();
-        outEmployee.setName("测试");
-        call(outEmployee);
-        System.out.println("employee:"+outEmployee.getName());
-    }
-
-    public static void call(Employee inEmployee) {
-        Employee employee = new Employee();
-        employee.setName("cba");
-        inEmployee.setName("abc");
-        inEmployee = employee;
-    }
-}
+//public class TripleTest2 {
+//    public static void main(String[] args) {
+//        MessageTest outEmployee = new MessageTest();
+//        outEmployee.setName("测试");
+//        call(outEmployee);
+//        System.out.println("employee:"+outEmployee.getName());
+//    }
+//
+//    public static void call(MessageTest inEmployee) {
+//        MessageTest employee = new MessageTest();
+//        employee.setName("cba");
+//        inEmployee.setName("abc");
+//        inEmployee = employee;
+//    }
+//}
diff --git a/java-base-demo/src/main/java/com/jay/skiplist/SkipList.java b/java-base-demo/src/main/java/com/jay/skiplist/SkipList.java
new file mode 100644
index 0000000..3642d11
--- /dev/null
+++ b/java-base-demo/src/main/java/com/jay/skiplist/SkipList.java
@@ -0,0 +1,93 @@
+package com.jay.skiplist;
+
+import java.util.Random;
+
+/**
+ * @author xiang.wei
+ * @date 2020/8/2 3:51 PM
+ */
+public class SkipList<T> {
+    private SkipListNode<T> head, tail;
+    /**
+     * 节点总数
+     */
+    private int nodes;
+    /**
+     * 层高
+     */
+    private int listLevel;
+    /**
+     * 随机函数
+     */
+    private Random random;
+    /**
+     * 向上提升一个的概率
+     */
+    private static final double PROBABILITY = 0.5;
+
+    public SkipList() {
+        random = new Random();
+        clear();
+    }
+
+    public void clear() {
+        head = new SkipListNode<T>(SkipListNode.HEAD_KEY, null);
+        tail = new SkipListNode<T>(SkipListNode.TAIL_KEY, null);
+        // TODO: 2020/8/2
+
+        listLevel = 0;
+        nodes = 0;
+    }
+
+    public boolean isEmpty() {
+        return nodes == 0;
+    }
+
+    public int size() {
+        return nodes;
+    }
+
+    /**
+     * 在最下面一层，找到要插入的位置前面的那个key
+     * @param key
+     * @return
+     */
+    private SkipListNode<T> findNode(int key) {
+        SkipListNode<T> p = head;
+        while (true) {
+            while (p.right.getKey() != SkipListNode.TAIL_KEY
+                    && p.right.getKey() <= key) {
+                p = p.right;
+            }
+            if (p.down != null) {
+                p = p.down;
+            } else {
+                break;
+            }
+        }
+        return p;
+    }
+
+    /**
+     * 查询是否存储key,存在则返回该节点，否则返回null
+     * @param key
+     * @return
+     */
+    public SkipListNode<T> search(int key) {
+        SkipListNode<T> p = findNode(key);
+        if (key == p.getKey()) {
+            return p;
+        } else {
+            return null;
+        }
+    }
+
+    public void put(int k, T v) {
+        SkipListNode<T> p = findNode(k);
+        //如果key值相同，替换原来的value即可结束
+        if (k == p.getKey()) {
+            p.setValue(v);
+            return;
+        }
+    }
+}
diff --git a/java-base-demo/src/main/java/com/jay/skiplist/SkipListNode.java b/java-base-demo/src/main/java/com/jay/skiplist/SkipListNode.java
new file mode 100644
index 0000000..94052db
--- /dev/null
+++ b/java-base-demo/src/main/java/com/jay/skiplist/SkipListNode.java
@@ -0,0 +1,70 @@
+package com.jay.skiplist;
+
+/**
+ * 跳跃表的节点，包括key-value和上下左右4个指针
+ * @author xiang.wei
+ * @date 2020/8/2 3:34 PM
+ */
+public class SkipListNode<T> {
+    private int key;
+    private T value;
+    /**
+     * 上下左右 四个指针
+     */
+    public SkipListNode<T> up,down,left, right;
+
+    /**
+     * 负无穷
+     */
+    public static final int HEAD_KEY = Integer.MIN_VALUE;
+    /**
+     * 正无穷
+     */
+    public static final int TAIL_KEY = Integer.MAX_VALUE;
+
+    public SkipListNode(int key, T value) {
+        this.key = key;
+        this.value = value;
+    }
+
+    public int getKey() {
+        return key;
+    }
+
+    public void setKey(int key) {
+        this.key = key;
+    }
+
+    public T getValue() {
+        return value;
+    }
+
+    public void setValue(T value) {
+        this.value = value;
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (this == obj) {
+            return true;
+        }
+        if (obj == null) {
+            return false;
+        }
+        if (!(obj instanceof SkipListNode<?>)) {
+            return false;
+        }
+        SkipListNode<T> ent;
+        try {
+            ent = (SkipListNode<T>) obj;
+        } catch (Exception e) {
+            return false;
+        }
+        return (ent.getKey() == key) && (ent.getValue() == value);
+    }
+
+    @Override
+    public String toString() {
+        return super.toString();
+    }
+}
diff --git a/java-base-demo/src/main/java/com/jay/skiplist/SkipListTest.java b/java-base-demo/src/main/java/com/jay/skiplist/SkipListTest.java
new file mode 100644
index 0000000..4695cee
--- /dev/null
+++ b/java-base-demo/src/main/java/com/jay/skiplist/SkipListTest.java
@@ -0,0 +1,8 @@
+package com.jay.skiplist;
+
+/**
+ * @author xiang.wei
+ * @date 2020/8/2 3:22 PM
+ */
+public class SkipListTest {
+}