java线程池实现多线程案例
时间: 2023-11-17 21:56:22 浏览: 42
下面是一个简单的 Java 线程池实现多线程的案例:
```java
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
public class ThreadPoolExample {
public static void main(String[] args) {
ExecutorService executor = Executors.newFixedThreadPool(5);
for (int i = 0; i < 10; i++) {
Runnable worker = new WorkerThread("" + i);
executor.execute(worker);
}
executor.shutdown();
while (!executor.isTerminated()) {
}
System.out.println("Finished all threads");
}
}
class WorkerThread implements Runnable {
private String message;
public WorkerThread(String s) {
this.message = s;
}
public void run() {
System.out.println(Thread.currentThread().getName() + " (Start) message = " + message);
processMessage();
System.out.println(Thread.currentThread().getName() + " (End)");
}
private void processMessage() {
try {
Thread.sleep(2000);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
```
在这个例子中,我们使用 `Executors.newFixedThreadPool()` 方法创建了一个固定大小的线程池,大小为 5。然后我们创建了 10 个 `WorkerThread` 实例,并将它们提交给线程池执行。每个 `WorkerThread` 实例都会打印出一个消息,并在执行 `processMessage()` 方法时休眠 2 秒钟。最后,我们调用 `executor.shutdown()` 方法来关闭线程池,并等待所有线程执行完毕。