补交作业

Author: tanshuai

Week_04/周六/JAVA并发编程（谭帅总结）.xmind

@@ -0,0 +1,53 @@
+package week04;
+
+import java.util.concurrent.*;
+
+/**
+ * 思考有多少种方式，在 main 函数启动一个新线程，
+ * 运行一个方法，拿到这个方法的返回值后，退出主线程？
+ */
+public class HomeWork {
+
+    public static void main(String[] args) throws ExecutionException, InterruptedException {
+        int result = 0;
+        result = method1();
+        System.out.println(result);
+        result = method2();
+        System.out.println(result);
+    }
+
+    private static int sum() {
+        return fibo(36);
+    }
+
+    private static int fibo(int a) {
+        if ( a < 2)
+            return 1;
+        return fibo(a-1) + fibo(a-2);
+    }
+
+    public static int method1() throws ExecutionException, InterruptedException {
+        // 创建线程池
+        ExecutorService executorService = Executors.newFixedThreadPool(1);
+        // 获取结果
+        Future<Integer> future = executorService.submit(new Callable<Integer>() {
+            @Override
+            public Integer call() throws Exception {
+                return HomeWork.sum();
+            }
+        });
+        executorService.shutdown();
+        return future.get();
+    }
+
+    public static int method2() throws ExecutionException, InterruptedException {
+        FutureTask<Integer> futureTask = new FutureTask<>(new Callable<Integer>() {
+            @Override
+            public Integer call() throws Exception {
+                return HomeWork.sum();
+            }
+        });
+        new Thread(futureTask).start();
+        return futureTask.get();
+    }
+}