ADD file via upload

SmartTV.java

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+/**
+ * 智能电视类
+ * 实现了Device、BrightnessAdjustable、MediaPlayable和Timable接口
+ */
+public class SmartTV implements Device, BrightnessAdjustable, MediaPlayable, Timable {
+    private String name;
+    private boolean on;
+    private int brightness;
+    private String currentMedia;
+    private String playbackStatus;
+    private int timerMinutes;
+    private boolean timerSet;
+    
+    public SmartTV(String name) {
+        this.name = name;
+        this.on = false;
+        this.brightness = 70; // 默认亮度70%
+        this.currentMedia = null;
+        this.playbackStatus = "停止";
+        this.timerMinutes = 0;
+        this.timerSet = false;
+    }
+    
+    @Override
+    public String getName() {
+        return name;
+    }
+    
+    @Override
+    public void turnOn() {
+        if (!on) {
+            on = true;
+            System.out.println(name + " 智能电视已开启");
+        }
+    }
+    
+    @Override
+    public void turnOff() {
+        if (on) {
+            on = false;
+            playbackStatus = "停止";
+            System.out.println(name + " 智能电视已关闭");
+        }
+    }
+    
+    @Override
+    public boolean isOn() {
+        return on;
+    }
+    
+    @Override
+    public void increaseBrightness(int level) {
+        if (on) {
+            brightness = Math.min(100, brightness + level);
+            System.out.println(name + " 亮度已增加到: " + brightness + "%");
+        }
+    }
+    
+    @Override
+    public void decreaseBrightness(int level) {
+        if (on) {
+            brightness = Math.max(0, brightness - level);
+            System.out.println(name + " 亮度已降低到: " + brightness + "%");
+        }
+    }
+    
+    @Override
+    public void setBrightness(int brightness) {
+        if (on) {
+            if (brightness >= 0 && brightness <= 100) {
+                this.brightness = brightness;
+                System.out.println(name + " 亮度已设置为: " + brightness + "%");
+            }
+        }
+    }
+    
+    @Override
+    public int getCurrentBrightness() {
+        return brightness;
+    }
+    
+    @Override
+    public void play(String mediaName) {
+        if (on) {
+            this.currentMedia = mediaName;
+            this.playbackStatus = "播放中: " + mediaName;
+            System.out.println(name + " 正在播放: " + mediaName);
+        }
+    }
+    
+    @Override
+    public void pause() {
+        if (on && "播放中: " + currentMedia.equals(playbackStatus)) {
+            this.playbackStatus = "暂停: " + currentMedia;
+            System.out.println(name + " 已暂停播放");
+        }
+    }
+    
+    @Override
+    public void stop() {
+        if (on) {
+            this.playbackStatus = "停止";
+            this.currentMedia = null;
+            System.out.println(name + " 已停止播放");
+        }
+    }
+    
+    @Override
+    public String getPlaybackStatus() {
+        return playbackStatus;
+    }
+    
+    @Override
+    public void setTimer(int minutes) {
+        if (on && minutes > 0) {
+            this.timerMinutes = minutes;
+            this.timerSet = true;
+            System.out.println(name + " 已设置定时器: " + minutes + " 分钟后关闭");
+        }
+    }
+    
+    @Override
+    public void cancelTimer() {
+        if (timerSet) {
+            this.timerSet = false;
+            this.timerMinutes = 0;
+            System.out.println(name + " 定时器已取消");
+        }
+    }
+    
+    @Override
+    public boolean isTimerSet() {
+        return timerSet;
+    }
+    
+    @Override
+    public int getRemainingTime() {
+        return timerMinutes;
+    }
+}