命令模式

src/main/java/top/fjy8018/designpattern/pattern/behavior/command/CloseCourseVideoCommand.java

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+package top.fjy8018.designpattern.pattern.behavior.command;
+
+/**
+ * 关闭视频命令
+ *
+ * @author F嘉阳
+ * @date 2020/7/21 15:58
+ */
+public class CloseCourseVideoCommand implements Command {
+    private final CourseVideo courseVideo;
+
+    public CloseCourseVideoCommand(CourseVideo courseVideo) {
+        this.courseVideo = courseVideo;
+    }
+
+    @Override
+    public void execute() {
+        courseVideo.close();
+    }
+}

src/main/java/top/fjy8018/designpattern/pattern/behavior/command/Command.java

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+package top.fjy8018.designpattern.pattern.behavior.command;
+
+/**
+ * 命令抽象
+ *
+ * @author F嘉阳
+ * @date 2020/7/21 15:58
+ */
+public interface Command {
+    void execute();
+}

src/main/java/top/fjy8018/designpattern/pattern/behavior/command/CourseVideo.java

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+package top.fjy8018.designpattern.pattern.behavior.command;
+
+/**
+ * 操作视频
+ *
+ * @author F嘉阳
+ * @date 2020/7/21 15:58
+ */
+public class CourseVideo {
+    private final String name;
+
+    public CourseVideo(String name) {
+        this.name = name;
+    }
+
+    public void open() {
+        System.out.println(this.name + "课程视频开放");
+    }
+
+    public void close() {
+        System.out.println(this.name + "课程视频关闭");
+    }
+}

src/main/java/top/fjy8018/designpattern/pattern/behavior/command/OpenCourseVideoCommand.java

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+package top.fjy8018.designpattern.pattern.behavior.command;
+
+/**
+ * 打开视频命令
+ *
+ * @author F嘉阳
+ * @date 2020/7/21 15:58
+ */
+public class OpenCourseVideoCommand implements Command {
+    private final CourseVideo courseVideo;
+
+    public OpenCourseVideoCommand(CourseVideo courseVideo) {
+        this.courseVideo = courseVideo;
+    }
+
+    @Override
+    public void execute() {
+        courseVideo.open();
+    }
+}

src/main/java/top/fjy8018/designpattern/pattern/behavior/command/Staff.java

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+package top.fjy8018.designpattern.pattern.behavior.command;
+
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * 命令执行人
+ *
+ * @author F嘉阳
+ * @date 2020/7/21 15:58
+ */
+public class Staff {
+    /**
+     * 保证执行顺序
+     */
+    private final List<Command> commandList = new ArrayList<Command>();
+
+    public void addCommand(Command command) {
+        commandList.add(command);
+    }
+
+    public void executeCommands() {
+        for (Command command : commandList) {
+            command.execute();
+        }
+        commandList.clear();
+    }
+
+}

src/test/java/top/fjy8018/designpattern/pattern/behavior/command/CommandTest.java

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+package top.fjy8018.designpattern.pattern.behavior.command;
+
+import org.junit.jupiter.api.Test;
+
+/**
+ * @author F嘉阳
+ * @date 2020/7/20 16:02
+ */
+class CommandTest {
+
+    @Test
+    void doTest() {
+        CourseVideo courseVideo = new CourseVideo("Java设计模式精讲");
+        OpenCourseVideoCommand openCourseVideoCommand = new OpenCourseVideoCommand(courseVideo);
+        CloseCourseVideoCommand closeCourseVideoCommand = new CloseCourseVideoCommand(courseVideo);
+
+        Staff staff = new Staff();
+
+        staff.addCommand(openCourseVideoCommand);
+        staff.addCommand(closeCourseVideoCommand);
+
+        staff.executeCommands();
+    }
+}