线程池demo

package test;

import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.Callable;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.Future;

public class Test1 {
    public static void main(String[] args) {
        test2();
    }

    public static void test1(){
        int count = Runtime.getRuntime().availableProcessors();
        ExecutorService service = Executors.newFixedThreadPool(count);

        A a = new A();

        try {
            for(int i = 0;i<count;i++){
                service.execute(a);
            }
        } catch (Exception e) {
            e.printStackTrace();
        } finally{
            if(!service.isShutdown()){
                service.shutdown();
            }
        }
    }

    public static void test2(){
        int count = Runtime.getRuntime().availableProcessors();
        ExecutorService service = Executors.newFixedThreadPool(count);

        B b = new B();

        List<Future<String>> list = new ArrayList<Future<String>>();
        try {
            for(int i = 0;i<count;i++){
                Future<String> f = service.submit(b);
                list.add(f);
            }
        } catch (Exception e) {
            e.printStackTrace();
        } finally{
            if(!service.isShutdown()){
                service.shutdown();
            }
        }

        try {
            String a = list.get(0).get();
            System.out.println("a:"+a);
        } catch (InterruptedException e) {
            e.printStackTrace();
        } catch (ExecutionException e) {
            e.printStackTrace();
        }

        System.out.println("next");

    }
}

class B implements Callable<String>{

    @Override
    public String call() throws Exception {
        String a = "call";
        Thread.sleep(10000);
        System.out.println(a);
        return a;
    }

}

class A implements Runnable {
    private int ticketNum = 1;
    private Object o = new Object();

    @Override
    public void run() {

        while(true){

            synchronized (o) {
                if(ticketNum>500000){
                    break;
                }

                System.out.println(Thread.currentThread().getName()+"出售了第"+ticketNum+"张票");

                ticketNum++;
            }

        }

    }

}