黑马程序员_多线程_生产者与消费者

android培训、java培训

 

建立Info类，用于生产的东西：

package rock.lee.thread.producer;   publicclass Info {          private String male;        private String female;          public Info() {               super();        }          public Info(String male, String female) {               super();               this.male = male;               this.female = female;        }          public String getMale() {               returnmale;        }          publicvoid setMale(String male) {               this.male = male;        }          public String getFemale() {               returnfemale;        }          @Override        public String toString() {               return"Info [male=" + male + ", female=" + female + "]";        }          publicvoid setFemale(String female) {               this.female = female;        } }

建立生产者：

package rock.lee.thread.producer;   publicclass Producer implements Runnable {          private Info info = null;          public Producer(Info info) {               super();               this.info = info;        }          /**         * 当flag标记位==true时，谢霆锋+张柏芝；flag=false时，陈冠希+钟欣桐         */        publicvoid run() {               boolean flag = false;               for (int i = 0; i < 50; i++) {                      if (flag) {                             this.info.setMale("谢霆锋");                             try {                                    Thread.sleep(100);                             } catch (InterruptedException e) {                                    e.printStackTrace();                             }                             this.info.setFemale("张柏芝");                             flag = false;// 改变标记位状态                      } else {                             this.info.setMale("陈冠希");                             try {                                    Thread.sleep(100);                             } catch (InterruptedException e) {                                    e.printStackTrace();                             }                             this.info.setFemale("钟欣桐");                             flag = true;                      }               }        } }

建立消费者：

package rock.lee.thread.producer;   publicclass Consumer implements Runnable {        private Info info = null;          public Consumer(Info info) {               super();               this.info = info;        }        /**         * 取出生产的数据         */        publicvoid run() {               for (int i = 0; i < 50; i++) {                      try {                             Thread.sleep(100);                      } catch (InterruptedException e) {                             e.printStackTrace();                      }                      System.out.println(info);               }        }   }

建立测试类：

package rock.lee.thread.producer;   publicclass TestThread {        /**         * @param args         */        publicstaticvoid main(String[] args) {               Info info = new Info();               Producer pro = new Producer(info);// 生产者               Consumer con = new Consumer(info);// 消费者               Thread tpro = new Thread(pro);               Thread tcon = new Thread(con);               tpro.start();               tcon.start();        } }

运行结果：发现谢霆锋à钟欣桐、陈冠希à张柏芝，数据发生了错误：输出内容

Info [male=谢霆锋, female=钟欣桐] Info [male=陈冠希, female=张柏芝] Info [male=谢霆锋, female=钟欣桐] Info [male=陈冠希, female=张柏芝] Info [male=谢霆锋, female=钟欣桐] Info [male=陈冠希, female=张柏芝] ….

问题解决：加入同步，使这4个人能够出现在正确的位置上。

修改Info类：

package rock.lee.thread.producer;   publicclass Info {          private String male;        private String female;          public Info() {               super();        }          public Info(String male, String female) {               super();               this.male = male;               this.female = female;        }          @Override        public String toString() {               return"Info [male=" + male + ", female=" + female + "]";        }          public synchronized void set(String male, String female) {               this.setMale(male);               try {                      Thread.sleep(100);               } catch (Exception e) {                      e.printStackTrace();               }               this.setFemale(female);        }        public synchronized void get(){               System.out.println(this.toString());        }    setter()、getter()….

修改Producer中的run()：

/**         * 当flag标记位==true时，谢霆锋+张柏芝；flag=false时，陈冠希+钟欣桐         */        publicvoid run() {               boolean flag = false;               for (int i = 0; i < 50; i++) {                      if (flag) {                             this.info.set("谢霆锋", "张柏芝"); // 设置数据                             flag = false;// 改变标记位状态                      } else {                             this.info.set("陈冠希", "钟欣桐");                             flag = true;                      }               }        }

修改Consumer中的run()：

publicvoid run() {               for (int i = 0; i < 50; i++) {                      try {                             Thread.sleep(100);                      } catch (InterruptedException e) {                             e.printStackTrace();                      }                      this.info.get();               }        }

测试后发现：谢霆锋à张柏芝被消费过度了，出现多次取出的情况：输出内容

Info [male=陈冠希, female=钟欣桐] Info [male=谢霆锋, female=张柏芝] Info [male=陈冠希, female=钟欣桐] Info [male=谢霆锋, female=张柏芝] Info [male=陈冠希, female=钟欣桐] Info [male=谢霆锋, female=张柏芝] Info [male=谢霆锋, female=张柏芝] Info [male=谢霆锋, female=张柏芝] Info [male=谢霆锋, female=张柏芝]

为了避免出现一个公众人物被过度消费的情况，加入等待唤醒，使谢霆锋和陈冠希可以同时被公众消费。

修改Info类中的set()和get()：

publicsynchronizedvoid set(String male, String female) {                 if (flag) {// true                      try {                             super.wait();// 线程等待                      } catch (InterruptedException e) {                             e.printStackTrace();                      }               }               this.setMale(male);               try {                      Thread.sleep(100);               } catch (Exception e) {                      e.printStackTrace();               }               this.setFemale(female);               flag = true;               super.notify();// 唤醒等待的线程        }          publicsynchronizedvoid get() {               if (!flag) {                      try {                             super.wait();// 线程等待                      } catch (InterruptedException e) {                             e.printStackTrace();                      }               }               try {                      Thread.sleep(100);               } catch (Exception e) {                      e.printStackTrace();               }               System.out.println(this.toString());               flag = false;               super.notify();// 唤醒等待的线程        }

解决了，谢霆锋和陈冠希某一个人被过度消费的问题，让他们两位轮换着同时被消费：输出内容

Info [male=陈冠希, female=钟欣桐] Info [male=谢霆锋, female=张柏芝] Info [male=陈冠希, female=钟欣桐] Info [male=谢霆锋, female=张柏芝] Info [male=陈冠希, female=钟欣桐] Info [male=谢霆锋, female=张柏芝] Info [male=陈冠希, female=钟欣桐]