java線程池

java1.5之後追加了一個并發通路的程式包： java.util.concurrent。對于此線程池操作的核心類和接口就定義在此包中。

這裡有2個核心的接口：

1、普通的執行線程池定義： java.util.concurrent.ExecutorService;

2、排程線程池：java.util.concurrent.ScheduledExecutorService;

一般可以使用 java.util.concurrent.Executors類完成線程池的建立

3、建立無大小限制的線程池： java.util.concurrent.ExecutorService newCachedThreadPool();

4、建立固定大小的線程池：java.util.concurrent.ExecutorService newFixedThreadPool(int nThreads);

5、建立單線程池：java.util.concurrent.ExecutorService newSingleThreadScheduledExecutor();

6、建立定時排程池：newScheduledThreadPool()

import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.TimeUnit;
import org.junit.Test;

public class testThreadPool {

    @Test
    public void test1() {
        //建立一個線程池的模型
        //ExecutorService executorService = Executors.newCachedThreadPool();  //建立無大小限制的線程池
        ExecutorService executorService = Executors.newFixedThreadPool(3);  //建立固定大小的線程池
        for(int x=0;x<10;x++){
            final int index=x;
            executorService.submit(new Runnable() {
                @Override
                public void run() {
                    System.out.println(Thread.currentThread().getName()+", x="+index);
                }
            });
        }
        executorService.shutdown();
    }

    public static void main(String[] args) {
        ScheduledExecutorService executorService = Executors.newScheduledThreadPool(1);  //建立定時排程池
        for(int x=0;x<10;x++){
            final int index=x;
            executorService.scheduleAtFixedRate(new Runnable() {
                @Override
                public void run() {
                    System.out.println(Thread.currentThread().getName()+", x="+index);
                }
            }, 3, 2, TimeUnit.SECONDS);
        }
    }
}