课程提问

Author: CPU-Code

pattern/README.md

@@ -126,9 +126,9 @@
 - [x] [课程模板模式](src/main/java/com/cpucode/pattern/behavior/template/course/NetworkCourseTest.java)
 - [x] [Jdbc模板模式](src/main/java/com/cpucode/pattern/behavior/template/jdbc/MemberDaoTest.java)
 
-## [观察者模式]()
+## [观察者模式](src/main/java/com/cpucode/pattern/behavior/observer)
 
-- [] []()
+- [x] [课程提问](src/main/java/com/cpucode/pattern/behavior/observer/course/advice/ObserverTest.java)
 
 ---------------
 

pattern/src/main/java/com/cpucode/pattern/behavior/observer/course/advice/Course.java

@@ -0,0 +1,37 @@
+package com.cpucode.pattern.behavior.observer.course.advice;
+
+import java.util.Observable;
+
+/**
+ * @author : cpucode
+ * @date : 2021/7/11
+ * @time : 23:26
+ * @github : https://github.com/CPU-Code
+ * @csdn : https://blog.csdn.net/qq_44226094
+ */
+public class Course extends Observable {
+    private String name = "课程";
+    private static Course course = null;
+
+    private Course(){}
+
+    public static Course getInstance(){
+        if (null == course){
+            course = new Course();
+        }
+
+        return course;
+    }
+
+
+    public String getName(){
+        return name;
+    }
+
+    public void publishQuestion(Question question){
+        System.out.println(question.getUserName() + "在" + this.name + "上提交了一个问题。");
+
+        setChanged();
+        notifyObservers(question);
+    }
+}

pattern/src/main/java/com/cpucode/pattern/behavior/observer/course/advice/ObserverTest.java

@@ -0,0 +1,25 @@
+package com.cpucode.pattern.behavior.observer.course.advice;
+
+/**
+ * @author : cpucode
+ * @date : 2021/7/11
+ * @time : 23:37
+ * @github : https://github.com/CPU-Code
+ * @csdn : https://blog.csdn.net/qq_44226094
+ */
+public class ObserverTest {
+    public static void main(String[] args){
+        Course course = Course.getInstance();
+        Teacher cpucode = new Teacher("cpucode");
+        Teacher tom = new Teacher("tom");
+
+        Question question = new Question();
+        question.setUserName("露露");
+        question.setContent("观察者设计模式适用于哪些场景？");
+
+        course.addObserver(cpucode);
+        course.addObserver(tom);
+        course.publishQuestion(question);
+    }
+
+}

pattern/src/main/java/com/cpucode/pattern/behavior/observer/course/advice/Question.java

@@ -0,0 +1,30 @@
+package com.cpucode.pattern.behavior.observer.course.advice;
+
+/**
+ * @author : cpucode
+ * @date : 2021/7/11
+ * @time : 23:29
+ * @github : https://github.com/CPU-Code
+ * @csdn : https://blog.csdn.net/qq_44226094
+ */
+public class Question {
+    private String userName;
+    private String content;
+
+    public String getUserName(){
+        return userName;
+    }
+
+    public void setUserName(String userName){
+        this.userName = userName;
+    }
+
+    public String getContent(){
+        return  content;
+    }
+
+    public void setContent(String content){
+        this.content = content;
+    }
+
+}

pattern/src/main/java/com/cpucode/pattern/behavior/observer/course/advice/Teacher.java

@@ -0,0 +1,33 @@
+package com.cpucode.pattern.behavior.observer.course.advice;
+
+import java.util.Observable;
+import java.util.Observer;
+import java.util.Queue;
+
+/**
+ * @author : cpucode
+ * @date : 2021/7/11
+ * @time : 23:33
+ * @github : https://github.com/CPU-Code
+ * @csdn : https://blog.csdn.net/qq_44226094
+ */
+public class Teacher implements Observer {
+    private String name;
+
+    public Teacher(String name){
+        this.name = name;
+    }
+
+    @Override
+    public void update(Observable o, Object arg) {
+        Course course = (Course) o;
+        Question question = (Question) arg;
+
+        System.out.println("=========================");
+        System.out.println(name + "老师，你好！\\n 您收到了一个来自“" +
+                course.getName() + "”的提问，希望您解答，问题内容如下：\n" +
+                question.getContent() + "\n 提问者：" +
+                question.getUserName());
+
+    }
+}