CompletionService接口定义了级别提交任务方法submit和获取结果方法take，poll等
package test.java.util.concurrent;
import java.util.concurrent.CompletionService;
import org.junit.Test;
/**
* CompletionService的测试类
*
* @date 2020-07-01 00:17:48
*/
public class CompletionServiceTest {
//abstract
//interface
}
