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桥接模式（Bridge Pattern）是一种结构型设计模式，它将抽象部分与实现部分分离，使它们可以独立地变化。桥接模式通过将抽象部分与实现部分分离，使得它们可以独立地变化，从而提高了系统的灵活性和可扩展性。

下面是一个简单的桥接模式的示例：

首先，我们定义一个抽象类 Shape，它有一个 draw() 方法：

public abstract class Shape {
    protected DrawAPI drawAPI;
    protected Shape(DrawAPI drawAPI) {
        this.drawAPI = drawAPI;
    }
    public abstract void draw();
}

然后，我们定义一个实现类 DrawAPI，它有一个 drawCircle() 方法：

public interface DrawAPI {
    public void drawCircle(int radius, int x, int y);
}

接下来，我们定义两个实现类 RedCircle 和 GreenCircle，它们实现了 DrawAPI 接口：

public class RedCircle implements DrawAPI {
    public void drawCircle(int radius, int x, int y) {
        System.out.println("Drawing Circle[ color: red, radius: " + radius + ", x: " + x + ", y: " + y + "]");
    }
}
public class GreenCircle implements DrawAPI {
    public void drawCircle(int radius, int x, int y) {
        System.out.println("Drawing Circle[ color: green, radius: " + radius + ", x: " + x + ", y: " + y + "]");
    }
}

最后，我们定义两个继承自 Shape 的实体类 Circle 和 Square，它们分别使用 RedCircle 和 GreenCircle 来绘制圆形和正方形：

public class Circle extends Shape {
    private int x, y, radius;
    public Circle(int x, int y, int radius, DrawAPI drawAPI) {
        super(drawAPI);
        this.x = x;
        this.y = y;
        this.radius = radius;
    }
    public void draw() {
        drawAPI.drawCircle(radius, x, y);
    }
}
public class Square extends Shape {
    private int x, y, side;
    public Square(int x, int y, int side, DrawAPI drawAPI) {
        super(drawAPI);
        this.x = x;
        this.y = y;
        this.side = side;
    }
    public void draw() {
        System.out.println("Drawing Square[ color: " + drawAPI.getClass().getSimpleName() + ", side: " + side + ", x: " + x + ", y: " + y + "]");
    }
}

现在，我们可以使用桥接模式来绘制不同颜色的圆形和正方形：

public class BridgePatternDemo {
    public static void main(String[] args) {
        Shape redCircle = new Circle(100, 100, 10, new RedCircle());
        Shape greenCircle = new Circle(100, 100, 10, new GreenCircle());
        Shape redSquare = new Square(100, 100, 10, new RedCircle());
        Shape greenSquare = new Square(100, 100, 10, new GreenCircle());
        redCircle.draw();
        greenCircle.draw();
        redSquare.draw();
        greenSquare.draw();
    }
}

输出结果如下：

Drawing Circle[ color: red, radius: 10, x: 100, y: 100]

Drawing Circle[ color: green, radius: 10, x: 100, y: 100]

Drawing Square[ color: RedCircle, side: 10, x: 100, y: 100]

Drawing Square[ color: GreenCircle, side: 10, x: 100, y: 100]

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