[wip]ch 21.2

yuki · yuki · commit af7cc33d45be · 2018-11-12T15:02:22.000+08:00
diff --git a/src/main/java/ch21/LiftOff.java b/src/main/java/ch21/LiftOff.java
@@ -0,0 +1,30 @@
+package ch21;
+
+/**
+ * @author yuzhe
+ * @since 11/12/18
+ */
+public class LiftOff implements Runnable {
+    protected int countDown = 10;
+    private static int taskCount=0;
+    private final int id = taskCount++;
+
+    public LiftOff(){}
+
+    public LiftOff(int countDown){
+        this.countDown = countDown;
+    }
+
+    public String status(){
+        return "#" + id + "(" + (countDown > 0 ? countDown : "liftOff!") + ")," ;
+    }
+
+    @Override
+    public void run() {
+        while (countDown-- > 0){
+            System.out.println(status());
+            Thread.yield();
+        }
+    }
+}
+
diff --git a/src/main/java/ch21/MainThread.java b/src/main/java/ch21/MainThread.java
@@ -0,0 +1,8 @@
+package ch21;
+
+public class MainThread{
+    public static void main(String[] args) {
+        LiftOff launch = new LiftOff();
+        launch.run();
+    }
+}
