二十三种设计模式全面解析-桥接模式的高级应用：构建灵活的跨平台UI框架

public abstract class Abstraction {
    protected Implementor implementor;
    public Abstraction(Implementor implementor) {
        this.implementor = implementor;
    }
    public abstract void operation();
}
public interface Implementor {
    void doSomething();
}

public class RefinedAbstractionA extends Abstraction {
    public RefinedAbstractionA(Implementor implementor) {
        super(implementor);
    }
    public void operation() {
        // 执行某些操作
        implementor.doSomething();
    }
}
public class RefinedAbstractionB extends Abstraction {
    public RefinedAbstractionB(Implementor implementor) {
        super(implementor);
    }
    public void operation() {
        // 执行不同的操作
        implementor.doSomething();
    }
}

public class ConcreteImplementorA implements Implementor {
    public void doSomething() {
        // 具体实现
    }
}
public class ConcreteImplementorB implements Implementor {
    public void doSomething() {
        // 具体实现
    }
}

public abstract class GUI {
    protected OS os;
    public GUI(OS os) {
        this.os = os;
    }
    public abstract void draw();
}
public interface OS {
    void render();
}

public class WindowsGUI extends GUI {
    public WindowsGUI(OS os) {
        super(os);
    }
    public void draw() {
        System.out.println("Drawing Windows-style GUI.");
        os.render();
    }
}
public class MacOSGUI extends GUI {
    public MacOSGUI(OS os) {
        super(os);
    }
    public void draw() {
        System.out.println("Drawing macOS-style GUI.");
        os.render();
    }
}