线程池
- corePoolSize:核心池的大小
- maximumPoolSize:最大线程数
- keepAliveTime:线程没有任务时最多保持多长时间后会终止
- JDK5.0起提供了线程池相关API:ExecutorService 和 Executors
- ExecutorService:真正的线程池接口。常见的子类ThreadPoolExecutor
- void execute(Runnable command) :执行任务/命令,没有返回值,一般用来执行Runnable
- Futuresubmit(Callabletask):执行任务,有返回值,一般又来执行Callable
- void shutdown():关闭连接池
- Executors:工具类,线程池的工厂类,用于创建并返回不同类型的线程池
使用线程池
package com.senior;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
// 测试线程池
public class TestPool {
public static void main(String[] args) {
// 1.创建服务,创建线程池
// newFixedThreadPool:参数为线程池大小
ExecutorService service = Executors.newFixedThreadPool(10);
// 执行
service.execute(new MyThread());
service.execute(new MyThread());
service.execute(new MyThread());
service.execute(new MyThread());
// 2.关闭连接
service.shutdown();
}
}
class MyThread implements Runnable{
@Override
public void run() {
System.out.println(Thread.currentThread().getName());
}
}