java代码练习 work188

work188.java

package test10;

public class work188
{

  public static void main(String[] args)
  {
    CableModem01 surfBoard = new CableModem01();
    DslModem gateway = new DslModem();
    surfBoard.speed = 500000;
    gateway.speed = 400000;
    System.out.println("尝试连接：");
    surfBoard.displaySpeed();
    surfBoard.connect();
    System.out.println("尝试连接:");
    gateway.displaySpeed();
    gateway.connect();

  }

}

class Modem01
{
  int speed;

  public void displaySpeed()
  {
    System.out.println("速率：" + speed );
  }
}

class CableModem01 extends Modem01
{
  String method = "电缆调制解调器";

  public void connect()
  {
    System.out.println("使用" + method);
    System.out.println("正在连接互联网...");
  }
}

class DslModem extends Modem01
{
  String method = "数字线路调制解调器";

  public void connect()
  {
    System.out.println("使用" + method);
    System.out.println("正在连接互联网...");
  }
}