桥接模式

桥接模式：将实现和抽象放在两个不同的类层次中，使两个层次可以独立改变。

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public abstract class Phone {
    //组合品牌
    private Brand brand;

    //构造器
    public Phone(Brand brand) {
        super();
        this.brand = brand;
    }
    
    protected void open() {
        this.brand.open();
    }
    protected void close() {
        brand.close();
    }
    protected void call() {
        brand.call();
    }
}

public class FoldedPhone extends Phone {

    //构造器
    public FoldedPhone(Brand brand) {
        super(brand);
    }
    
    public void open() {
        super.open();
        System.out.println(" 折叠样式手机 ");
    }
    
    public void close() {
        super.close();
        System.out.println(" 折叠样式手机 ");
    }
    
    public void call() {
        super.call();
        System.out.println(" 折叠样式手机 ");
    }
}
public class UpRightPhone extends Phone {
    
    //构造器
    public UpRightPhone(Brand brand) {
        super(brand);
    }
    
    public void open() {
        super.open();
        System.out.println(" 直立样式手机 ");
    }
    
    public void close() {
        super.close();
        System.out.println(" 直立样式手机 ");
    }
    
    public void call() {
        super.call();
        System.out.println(" 直立样式手机 ");
    }
}

//接口
public interface Brand {
    void open();
    void close();
    void call();
}
public class Vivo implements Brand {
    @Override
    public void open() {
        System.out.println(" Vivo手机开机 ");
    }

    @Override
    public void close() {
        System.out.println(" Vivo手机关机 ");
    }

    @Override
    public void call() {
        System.out.println(" Vivo手机打电话 ");
    }
}
public class XiaoMi implements Brand {
    @Override
    public void open() {
        System.out.println(" 小米手机开机 ");
    }

    @Override
    public void close() {
        System.out.println(" 小米手机关机 ");
    }

    @Override
    public void call() {
        System.out.println(" 小米手机打电话 ");
    }
}

public class Client {
    public static void main(String[] args) {
        //获取折叠式手机 (样式 + 品牌 )
        Phone phone1 = new FoldedPhone(new XiaoMi());
        phone1.open();
        phone1.call();
        phone1.close();
        System.out.println("=======================");
        Phone phone2 = new FoldedPhone(new Vivo());
        phone2.open();
        phone2.call();
        phone2.close();
        System.out.println("==============");
        UpRightPhone phone3 = new UpRightPhone(new XiaoMi());
        phone3.open();
        phone3.call();
        phone3.close();
        System.out.println("==============");
        UpRightPhone phone4 = new UpRightPhone(new Vivo());
        phone4.open();
        phone4.call();
        phone4.close();
    }
}

这里面的Phone就类似于桥，调Phone的方法open方法，其实是调Brand的open方法，Phone充当桥的作用。