diff --git a/s-day06/src/com/inmind/thread_safe_lock07/Demo08.java b/s-day06/src/com/inmind/thread_safe_lock07/Demo08.java
new file mode 100644
index 0000000..c22dcce
--- /dev/null
+++ b/s-day06/src/com/inmind/thread_safe_lock07/Demo08.java
@@ -0,0 +1,17 @@
+package com.inmind.thread_safe_lock07;
+
+/*
+Lock接口的常用实现类 ReentrantLock
+常用方法:
+lock():加锁
+unlock():释放锁
+ */
+public class Demo08 {
+    public static void main(String[] args) {
+        //创建卖票任务
+        TicketTask ticketTask = new TicketTask();
+        new Thread(ticketTask, "窗口1").start();
+        new Thread(ticketTask,"窗口2").start();
+        new Thread(ticketTask,"窗口3").start();
+    }
+}
diff --git a/s-day06/src/com/inmind/thread_safe_lock07/TicketTask.java b/s-day06/src/com/inmind/thread_safe_lock07/TicketTask.java
new file mode 100644
index 0000000..94be1c2
--- /dev/null
+++ b/s-day06/src/com/inmind/thread_safe_lock07/TicketTask.java
@@ -0,0 +1,33 @@
+package com.inmind.thread_safe_lock07;
+
+import java.util.concurrent.locks.Lock;
+import java.util.concurrent.locks.ReentrantLock;
+
+//卖票任务:就是卖100张票
+public class TicketTask implements Runnable{
+    int ticketCount = 100;//100张票
+    Lock lock = new ReentrantLock();//Lock对象
+
+    @Override
+    public void run() {
+        //有票就卖
+        while (true) {
+//            synchronized (lock){//同步代码块：只有拥有锁对象的线程才能进入同步代码块去执行
+            lock.lock();//加锁
+                //如果有票就卖
+                if (ticketCount > 0) {
+                    try {
+                        Thread.sleep(50);
+                    } catch (InterruptedException e) {
+                        e.printStackTrace();
+                    }
+                    System.out.println(Thread.currentThread().getName() + "正在卖第" + ticketCount + "张票");
+                    ticketCount--;
+                } else {
+                    break;
+                }
+                lock.unlock();//释放锁
+//            }//当线程执行完毕该同步代码块之后，锁对象就会释放
+        }
+    }
+}