JAVA基础-多线程同步
需要处理一万条上数据,每条数据都需要执行一个耗时任务,开启10个线程进行处理
import java.util.concurrent.ExecutorService; import java.util.concurrent.Executors; import java.util.concurrent.TimeUnit; public class Main { private static final int NUM_THREADS = 10; private static final int NUM_TASKS = 10000; public static void main(String[] args) throws InterruptedException { // 创建一个线程池 ExecutorService executor = Executors.newFixedThreadPool(NUM_THREADS); // 提交任务 for (int i = 0; i < NUM_TASKS; i++) { final int taskId = i; executor.submit(new Runnable() { @Override public void run() { // 调用耗时任务的接口 // TODO: 处理数据的逻辑 System.out.println("任务" + taskId + "完成"); } }); } // 关闭线程池 executor.shutdown(); // 等待所有任务完成 executor.awaitTermination(Long.MAX_VALUE, TimeUnit.NANOSECONDS); // 所有任务完成后打印完成 System.out.println("所有任务已完成"); } }
如果需要每个耗时任务都需要间隔5秒执行,代码如下:
import java.util.concurrent.ExecutorService; import java.util.concurrent.Executors; import java.util.concurrent.TimeUnit; public class Main { private static final int NUM_THREADS = 10; private static final int NUM_TASKS = 10000; public static void main(String[] args) throws InterruptedException { // 创建一个线程池 ExecutorService executor = Executors.newFixedThreadPool(NUM_THREADS); // 提交任务 for (int i = 0; i < NUM_TASKS; i++) { final int taskId = i; executor.submit(new Runnable() { @Override public void run() { // 调用耗时任务的接口 // TODO: 处理数据的逻辑 try { Thread.sleep(5000); } catch (InterruptedException e) { e.printStackTrace(); } System.out.println("任务" + taskId + "完成"); } }); } // 关闭线程池 executor.shutdown(); // 等待所有任务完成 executor.awaitTermination(Long.MAX_VALUE, TimeUnit.NANOSECONDS); // 所有任务完成后打印完成 System.out.println("所有任务已完成"); } }