作业2 future实现

shibo · shibo · commit b350b022e7ca · 2021-10-17T22:38:59.000+08:00
diff --git a/03concurrency/0301/src/main/java/java0/conc0303/homework03/Homework1.java b/03concurrency/0301/src/main/java/java0/conc0303/homework03/Homework1.java
@@ -0,0 +1,34 @@
+package java0.conc0303.homework03;
+
+
+import java.util.concurrent.Callable;
+import java.util.concurrent.ExecutionException;
+import java.util.concurrent.FutureTask;
+
+public class Homework1 {
+
+    public static void main(String[] args) throws InterruptedException, ExecutionException {
+        long start = System.currentTimeMillis();
+
+        Homework1 demo = new Homework1();
+
+        FutureTask<Integer> task = new FutureTask<>(new Callable<Integer>() {
+            @Override
+            public Integer call() throws Exception {
+                return demo.sum();
+            }
+        });
+        new Thread(task).start();
+        System.out.println(Thread.currentThread().getName() + "异步计算的结果为：" + task.get());
+        System.out.println(Thread.currentThread().getName() + "使用时间：" + (System.currentTimeMillis() - start) + " ms");
+    }
+
+    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);
+    }}
