增加-线程池测试案例

src/test/java/ThreadPoolTest.java

+import java.util.ArrayList;
+import java.util.List;
+import java.util.concurrent.Callable;
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.Executors;
+import java.util.concurrent.Future;
+
+/**
+ * 线程池测试案例
+ */
+public class ThreadPoolTest {
+
+    public static void main(String[] args) throws Exception {
+        // 开始时间
+        long start = System.currentTimeMillis();
+        List<String> list = new ArrayList<String>();
+        for (int i = 1; i <= 3000; i++) {
+            list.add(i + "");
+        }
+        // 每500条数据开启一条线程
+        int threadSize = 500;
+        // 总数据条数
+        int dataSize = list.size();
+        // 线程数
+        int threadNum = dataSize / threadSize + 1;
+        // 定义标记,过滤threadNum为整数
+        boolean special = dataSize % threadSize == 0;
+        // 创建一个线程池
+        ExecutorService exec = Executors.newFixedThreadPool(threadNum);
+        // 定义一个任务集合
+        List<Callable<Integer>> tasks = new ArrayList<Callable<Integer>>();
+        Callable<Integer> task = null;
+        List<String> cutList = null;
+        // 确定每条线程的数据
+        for (int i = 0; i < threadNum; i++) {
+            if (i == threadNum - 1) {
+                if (special) {
+                    break;
+                }
+                cutList = list.subList(threadSize * i, dataSize);
+            } else {
+                cutList = list.subList(threadSize * i, threadSize * (i + 1));
+            }
+            final List<String> listStr = cutList;
+            task = new Callable<Integer>() {
+                @Override
+                public Integer call() throws Exception {
+                    System.out.println(Thread.currentThread().getName() + "线程：" + listStr);
+                    return 1;
+                }
+            };
+            // 这里提交的任务容器列表和返回的Future列表存在顺序对应的关系
+            tasks.add(task);
+        }
+        List<Future<Integer>> results = exec.invokeAll(tasks);
+        for (Future<Integer> future : results) {
+            System.out.println(future.get());
+        }
+        // 关闭线程池
+        exec.shutdown();
+        System.out.println("线程任务执行结束");
+        System.err.println("执行任务消耗了 ：" + (System.currentTimeMillis() - start) + "毫秒");
+    }
+}