Java多线程的实战应用

一.实现 Callable<String>接口，重写call()方法

import com.google.common.collect.Lists;
import java.util.List;
import java.util.concurrent.Callable;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.Future;

public class JustTest2 {
    public static void main(String[] args) {
        Callable<String> callable = null;
        //创建大小为5的线程池
        ExecutorService executor = Executors.newFixedThreadPool(5);
        List<Future<String>> results = Lists.newArrayList();

        for (int i = 0; i < 10; i++) {
            callable = new TestCallable("data1", "data2",String.valueOf(i));
            Future<String> result = executor.submit(callable);
            //把结果都放入results集合中
            results.add(result);
        }
        //关闭线程池
        executor.shutdown();

        for (Future<String> result : results) {
            try {
                //get()获取 返回的结果
                System.out.println(result.get());
            } catch (Exception e) {
            }
        }
    }

}

/**
 * 内部类：实现Callable接口
 * 重写call()方法
 */
class TestCallable implements Callable<String> {
    private String data1;
    private String data2;
    private String flag;

    public TestCallable(String data1, String data2,String flag) {
        this.data1 = data1;
        this.data2 = data2;
        this.flag = flag;
    }

    @Override
    public String call() {
        if(flag.equals("1")){
            return data1;
        }
        return data2;
    }
}

二，运行结果为