如何在Java中实现桥接模式

// 1. 定义实现接口 (Implementor)
interface Device {
    void turnOn();
    void turnOff();
    void setChannel(int channel);
    String getName();
}

// 2. 实现接口的具体类 (Concrete Implementor)
class TV implements Device {
    private boolean isOn = false;
    private int channel = 1;

    @Override
    public void turnOn() {
        isOn = true;
        System.out.println("TV: ON");
    }

    @Override
    public void turnOff() {
        isOn = false;
        System.out.println("TV: OFF");
    }

    @Override
    public void setChannel(int channel) {
        if (isOn) {
            this.channel = channel;
            System.out.println("TV: Channel set to " + this.channel);
        } else {
            System.out.println("TV: Cannot set channel, TV is off.");
        }
    }

    @Override
    public String getName() {
        return "TV";
    }
}

class Radio implements Device {
    private boolean isOn = false;
    private int volume = 0; // 假设收音机没有频道，只有音量

    @Override
    public void turnOn() {
        isOn = true;
        System.out.println("Radio: ON");
    }

    @Override
    public void turnOff() {
        isOn = false;
        System.out.println("Radio: OFF");
    }

    @Override
    public void setChannel(int frequency) { // 这里借用setChannel表示设置频率
        if (isOn) {
            this.volume = frequency; // 简单模拟，实际可能是设置频率
            System.out.println("Radio: Frequency set to " + this.volume + " MHz");
        } else {
            System.out.println("Radio: Cannot set frequency, Radio is off.");
        }
    }

    @Override
    public String getName() {
        return "Radio";
    }
}

// 3. 定义抽象类 (Abstraction)
abstract class RemoteControl {
    protected Device device; // 抽象层持有实现层的引用

    public RemoteControl(Device device) {
        this.device = device;
    }

    public abstract void powerOn();
    public abstract void powerOff();
    public abstract void changeChannel(int channel);
}

// 4. 实现抽象的具体类 (Refined Abstraction)
class BasicRemote extends RemoteControl {
    public BasicRemote(Device device) {
        super(device);
    }

    @Override
    public void powerOn() {
        System.out.println("BasicRemote: Powering on " + device.getName());
        device.turnOn();
    }

    @Override
    public void powerOff() {
        System.out.println("BasicRemote: Powering off " + device.getName());
        device.turnOff();
    }

    @Override
    public void changeChannel(int channel) {
        System.out.println("BasicRemote: Changing channel on " + device.getName());
        device.setChannel(channel);
    }
}

class AdvancedRemote extends RemoteControl {
    public AdvancedRemote(Device device) {
        super(device);
    }

    @Override
    public void powerOn() {
        System.out.println("AdvancedRemote: Powering on " + device.getName() + " with advanced settings.");
        device.turnOn();
    }

    @Override
    public void powerOff() {
        System.out.println("AdvancedRemote: Powering off " + device.getName() + " with advanced settings.");
        device.turnOff();
    }

    @Override
    public void changeChannel(int channel) {
        System.out.println("AdvancedRemote: Changing channel on " + device.getName() + " to " + channel + " (advanced operation).");
        device.setChannel(channel);
    }

    public void mute() { // 高级遥控器特有的功能
        System.out.println("AdvancedRemote: Muting " + device.getName());
        // 假设设备有静音功能，这里简化处理
        System.out.println(device.getName() + " is now muted.");
    }
}

// 5. 客户端代码
public class BridgePatternDemo {
    public static void main(String[] args) {
        Device tv = new TV();
        RemoteControl basicRemoteForTV = new BasicRemote(tv);
        basicRemoteForTV.powerOn();
        basicRemoteForTV.changeChannel(5);
        basicRemoteForTV.powerOff();

        System.out.println("---");

        Device radio = new Radio();
        RemoteControl advancedRemoteForRadio = new AdvancedRemote(radio);
        advancedRemoteForRadio.powerOn();
        advancedRemoteForRadio.changeChannel(98); // 这里是设置频率
        ((AdvancedRemote) advancedRemoteForRadio).mute(); // 调用高级遥控器特有功能
        advancedRemoteForRadio.powerOff();

        System.out.println("---");

        // 另一个例子：用高级遥控器控制TV
        RemoteControl advancedRemoteForTV = new AdvancedRemote(tv);
        advancedRemoteForTV.powerOn();
        advancedRemoteForTV.changeChannel(10);
        ((AdvancedRemote) advancedRemoteForTV).mute();
        advancedRemoteForTV.powerOff();
    }
}

BasicTVRemote

AdvancedTVRemote

BasicRadioRemote

AdvancedRadioRemote