信 息 工 程 学 院
《Java语言程序设计》实验报告
学院: | 班级: | 姓名: | 学号: | 成绩: |
1、实习目标
(1) 掌握 Java 多线程的概念和实现
(2) 掌握使用继承 Thread 产生线程
(3) 实现 Runnable 接口产生线程
(4) 掌握 wait-notify 机制
2、实验过程
任务一：多线程输出字符串（继承 Thread 类）
创建两个独立的线程，一个线程打印 20 次“A”，另一个线程打
印 20 次“B”，输出结果类似于：
ABBABAABBA….
/* 两个独立线程，分别输出 A 和 B */
要求：使用继承 Thread 类的方式实现线程对象
代码截图：
PrintA类：
![](https://wkrtcs.bdimg.com/rtcs/image?w=471&md5sum=260acb29fa7d5f1a7765560a0eae3614&sign=a3f1b14820&rtcs_flag=1&rtcs_ver=3&l=webapp&bucketNum=170&ipr={"t":"img","w":"471","h":"393","dataType":"png","c":"word/media/image1.png","imgOriW":471,"imgOriH":393})
PrintB类：
![](https://wkrtcs.bdimg.com/rtcs/image?w=481&md5sum=260acb29fa7d5f1a7765560a0eae3614&sign=a3f1b14820&rtcs_flag=1&rtcs_ver=3&l=webapp&bucketNum=170&ipr={"t":"img","w":"481","h":"400","dataType":"png","c":"word/media/image2.png","imgOriW":481,"imgOriH":400})
PrintTest类：
![](https://wkrtcs.bdimg.com/rtcs/image?w=459&md5sum=260acb29fa7d5f1a7765560a0eae3614&sign=a3f1b14820&rtcs_flag=1&rtcs_ver=3&l=webapp&bucketNum=170&ipr={"t":"img","w":"459","h":"246","dataType":"png","c":"word/media/image3.png","imgOriW":459,"imgOriH":246})
运行结果：
![](https://wkrtcs.bdimg.com/rtcs/image?w=441&md5sum=260acb29fa7d5f1a7765560a0eae3614&sign=a3f1b14820&rtcs_flag=1&rtcs_ver=3&l=webapp&bucketNum=170&ipr={"t":"img","w":"441","h":"290","dataType":"png","c":"word/media/image4.png","imgOriW":441,"imgOriH":290})
任务二：多个线程共同执行目标对象的任务（实现 Runnable）
有一批零件（Part）的生产任务，总量是 800 个，生产一个零
件耗时 10ms。有 4 个车间（Workshop）共同完成这一批任务。
（选做）分别统计每个车间各自生产了多少个零件并输出。
代码截图：
Part类：
![](https://wkrtcs.bdimg.com/rtcs/image?w=546&md5sum=260acb29fa7d5f1a7765560a0eae3614&sign=a3f1b14820&rtcs_flag=1&rtcs_ver=3&l=webapp&bucketNum=170&ipr={"t":"img","w":"546","h":"387","dataType":"png","c":"word/media/image5.png","imgOriW":853,"imgOriH":604})
WorkShop类：
![](https://wkrtcs.bdimg.com/rtcs/image?w=549&md5sum=260acb29fa7d5f1a7765560a0eae3614&sign=a3f1b14820&rtcs_flag=1&rtcs_ver=3&l=webapp&bucketNum=170&ipr={"t":"img","w":"549","h":"320","dataType":"png","c":"word/media/image6.png","imgOriW":584,"imgOriH":340})
运行结果：
![](https://wkrtcs.bdimg.com/rtcs/image?w=320&md5sum=260acb29fa7d5f1a7765560a0eae3614&sign=a3f1b14820&rtcs_flag=1&rtcs_ver=3&l=webapp&bucketNum=170&ipr={"t":"img","w":"320","h":"381","dataType":"png","c":"word/media/image7.png","imgOriW":320,"imgOriH":381})
![](https://wkrtcs.bdimg.com/rtcs/image?w=383&md5sum=260acb29fa7d5f1a7765560a0eae3614&sign=a3f1b14820&rtcs_flag=1&rtcs_ver=3&l=webapp&bucketNum=170&ipr={"t":"img","w":"383","h":"366","dataType":"png","c":"word/media/image8.png","imgOriW":383,"imgOriH":366})
此处“workshop * 生产零件 * 个”的意思是该线程执行了第 * 次，而不是说该线程共执行了 * 次。
最后四行指出了每条线程执行命令的总数。
值得注意的是，同样的程序，在机房运行，与在我自己的电脑上运行，结果各个线程交替执行的情况差别很大，这也许与CPU的型号有关。
机房是 Intel i7-4790 4核8线程
我的是AMD R5-1600X 6核12线程
任务三：生产者-消费者问题（线程间通信）
有一种商品 Product 类，一个货架类（GoodsShelf）:拥有
一个容量为 size（可根据需要设定大小）的 Product 数组。生产
者（Producer）往货架上放置商品，消费者（Consumer）从货
架上消费商品。二者是并发执行的。（货架空的时候只能生产，货架
满的时候只能消费。）使用多线程并发机制和线程间通信，模拟商品
编号从 1 到 100 的生产和消费过程。
要求：
（必做）只模拟一个生产者和一个消费者的情况；
（选作）模拟 2 个生产者和 3 个消费者的情况，生产商品的时间和
消费商品的时间可以调整 Thread.sleep(整型值)。
代码截图：
Consumer类：
![](https://wkrtcs.bdimg.com/rtcs/image?w=517&md5sum=260acb29fa7d5f1a7765560a0eae3614&sign=a3f1b14820&rtcs_flag=1&rtcs_ver=3&l=webapp&bucketNum=170&ipr={"t":"img","w":"517","h":"521","dataType":"png","c":"word/media/image9.png","imgOriW":517,"imgOriH":521})
Producer类：
![](https://wkrtcs.bdimg.com/rtcs/image?w=552&md5sum=260acb29fa7d5f1a7765560a0eae3614&sign=a3f1b14820&rtcs_flag=1&rtcs_ver=3&l=webapp&bucketNum=170&ipr={"t":"img","w":"552","h":"484","dataType":"png","c":"word/media/image10.png","imgOriW":587,"imgOriH":515})
Product类：
![](https://wkrtcs.bdimg.com/rtcs/image?w=425&md5sum=260acb29fa7d5f1a7765560a0eae3614&sign=a3f1b14820&rtcs_flag=1&rtcs_ver=3&l=webapp&bucketNum=170&ipr={"t":"img","w":"425","h":"317","dataType":"png","c":"word/media/image11.png","imgOriW":425,"imgOriH":317})
GoodsShelf类：
![](https://wkrtcs.bdimg.com/rtcs/image?w=546&md5sum=260acb29fa7d5f1a7765560a0eae3614&sign=a3f1b14820&rtcs_flag=1&rtcs_ver=3&l=webapp&bucketNum=170&ipr={"t":"img","w":"546","h":"474","dataType":"png","c":"word/media/image12.png","imgOriW":910,"imgOriH":790})
JustFuckingBuyIt类：
![](https://wkrtcs.bdimg.com/rtcs/image?w=530&md5sum=260acb29fa7d5f1a7765560a0eae3614&sign=a3f1b14820&rtcs_flag=1&rtcs_ver=3&l=webapp&bucketNum=170&ipr={"t":"img","w":"530","h":"572","dataType":"png","c":"word/media/image14.png","imgOriW":530,"imgOriH":572})
运行结果：
![](https://wkrtcs.bdimg.com/rtcs/image?w=452&md5sum=260acb29fa7d5f1a7765560a0eae3614&sign=a3f1b14820&rtcs_flag=1&rtcs_ver=3&l=webapp&bucketNum=170&ipr={"t":"img","w":"452","h":"818","dataType":"png","c":"word/media/image15.png","imgOriW":452,"imgOriH":818})
代码解释见代码中的注释。
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