中介者模式

src/main/java/top/fjy8018/designpattern/pattern/behavior/mediator/StudyGroup.java

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+package top.fjy8018.designpattern.pattern.behavior.mediator;
+
+import java.util.Date;
+import java.util.Timer;
+
+/**
+ * 学习群组（中介者）
+ * <p>
+ * jdk源码 {@link Timer#schedule(java.util.TimerTask, Date)} 多个方法重载
+ * 都是调用{@link Timer#sched(java.util.TimerTask, long, long)} 实现的，由底层方法进行整体协调
+ *
+ * @author F嘉阳
+ * @date 2020/7/21 16:20
+ */
+public class StudyGroup {
+
+    public static void showMessage(User user, String message) {
+        System.out.println(new Date().toString() + " [" + user.getName() + "] : " + message);
+    }
+}

src/main/java/top/fjy8018/designpattern/pattern/behavior/mediator/User.java

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+package top.fjy8018.designpattern.pattern.behavior.mediator;
+
+/**
+ * @author F嘉阳
+ * @date 2020/7/21 16:20
+ */
+public class User {
+    private String name;
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public User(String name) {
+        this.name = name;
+    }
+
+    public void sendMessage(String message) {
+        // 只和中介者交互
+        StudyGroup.showMessage(this, message);
+    }
+}

src/test/java/top/fjy8018/designpattern/pattern/behavior/mediator/MediatorTest.java

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+package top.fjy8018.designpattern.pattern.behavior.mediator;
+
+import org.junit.jupiter.api.Test;
+
+/**
+ * @author F嘉阳
+ * @date 2020/7/21 16:25
+ */
+class MediatorTest {
+
+    @Test
+    void doTest() {
+        User fjy = new User("F嘉阳");
+        User tom = new User("Tom");
+
+        fjy.sendMessage(" Hey! Tom! Let's learn Design Pattern");
+        tom.sendMessage("OK! F嘉阳");
+    }
+}