Java设计模式之桥接模式

/**
 * 奔驰品牌类
 * @author tcy
 * @Date 05-08-2022
 */
public interface BenzBrand {
    void showInfo();
}

/**
 * @author tcy
 * @Date 05-08-2022
 */
public class BenzE implements BenzBrand{
    @Override
    public void showInfo() {
        System.out.print("【奔驰E】颜色是:");
    }
}

/**
 * @author tcy
 * @Date 05-08-2022
 */
public class BenzG implements BenzBrand{
    @Override
    public void showInfo() {
        System.out.print("【奔驰G】颜色是:");

    }
}

/**
 * 抽象奔驰类
 * @author tcy
 * @Date 05-08-2022
 */
public abstract class Benz {
    // 将品牌组合进来
    protected BenzBrand benzBrand;

    public Benz(BenzBrand benzBrand) {
        this.benzBrand = benzBrand;
    }

    public void showInfo(){
        benzBrand.showInfo();
    }
}

/**
 * @author tcy
 * @Date 05-08-2022
 */
public class BlackBenz extends Benz {
    public BlackBenz(BenzBrand benzBrand) {
        super(benzBrand);
    }

    @Override
    public void showInfo() {
        super.showInfo();

        System.out.println("黑色...");
    }
}

/**
 * @author tcy
 * @Date 05-08-2022
 */
public class RedBenz extends Benz {
    public RedBenz(BenzBrand benzBrand) {
        super(benzBrand);
    }
    @Override
    public void showInfo() {
        super.showInfo();
        System.out.println("红色...");
    }
}

/**
 * @author tcy
 * @Date 05-08-2022
 */
public class Client {

    public static void main(String[] args) {
        // 黑色奔驰E
        Benz benz1 = new BlackBenz(new BenzE());
        benz1.showInfo();
        // 黑色奔驰G
        Benz benz2 = new BlackBenz(new BenzG());
        benz2.showInfo();
        // 红色奔驰E
        Benz benz3 = new RedBenz(new BenzE());
        benz3.showInfo();
        // 红色奔驰G
        Benz benz4 = new RedBenz(new BenzG());
        benz4.showInfo();
    }
}

public class Driver extends NonRegisteringDriver implements java.sql.Driver {
    public Driver() throws SQLException {
    }

    static {
        try {
            DriverManager.registerDriver(new Driver());
        } catch (SQLException var1) {
            throw new RuntimeException("Can't register driver!");
        }
    }
}

    public class DriverManager {
    
    public static Connection getConnection(String url,
        String user, String password) throws SQLException {
        java.util.Properties info = new java.util.Properties();
    if (user != null) {
        info.put("user", user);
    }
    if (password != null) {
        info.put("password", password);
    }

    return (getConnection(url, info, Reflection.getCallerClass()));
}

private static Connection getConnection(
    String url, java.util.Properties info, Class<?> caller) throws SQLException {
    /*
     * When callerCl is null, we should check the application's
     * (which is invoking this class indirectly)
     * classloader, so that the JDBC driver class outside rt.jar
     * can be loaded from here.
     */
    ClassLoader callerCL = caller != null ? caller.getClassLoader() : null;
    synchronized(DriverManager.class) {
        // synchronize loading of the correct classloader.
        if (callerCL == null) {
            callerCL = Thread.currentThread().getContextClassLoader();
        }
    }

    if(url == null) {
        throw new SQLException("The url cannot be null", "08001");
    }

    println("DriverManager.getConnection(\""   url   "\")");

    // Walk through the loaded registeredDrivers attempting to make a connection.
    // Remember the first exception that gets raised so we can reraise it.
    SQLException reason = null;

    for(DriverInfo aDriver : registeredDrivers) {
        // If the caller does not have permission to load the driver then
        // skip it.
        if(isDriverAllowed(aDriver.driver, callerCL)) {
            try {
                println("    trying "   aDriver.driver.getClass().getName());
                Connection con = aDriver.driver.connect(url, info);
                if (con != null) {
                    // Success!
                    println("getConnection returning "   aDriver.driver.getClass().getName());
                    return (con);
                }
            } catch (SQLException ex) {
                if (reason == null) {
                    reason = ex;
                }
            }

        } else {
            println("    skipping: "   aDriver.getClass().getName());
        }

    }

    // if we got here nobody could connect.
    if (reason != null)    {
        println("getConnection failed: "   reason);
        throw reason;
    }

    println("getConnection: no suitable driver found for "  url);
    throw new SQLException("No suitable driver found for "  url, "08001");
}
}
}