update:demo9

com/study/demo9/TaskRunner.java

@@ -0,0 +1,19 @@
+package com.study.demo9;
+
+public class TaskRunner {
+    public void runTask() {
+        class LocalTask {
+            void execute() {
+                System.out.println("正在执行临时任务");
+            }
+        }
+
+        LocalTask task = new LocalTask();
+        task.execute();
+    }
+
+    public static void main(String[] args) {
+        TaskRunner runner = new TaskRunner();
+        runner.runTask();
+    }
+}