Java 多态，接口

package traffic;

public class traffictool {
	
public void go()
{
  System.out.println();	///子类将重写之，不能省去
}
///public abstract void go();
}
/**********************抽象类
package traffic;
abstract public class traffictool
{
	public abstract void go();
}

*************************/



package traffic;

public class bike extends traffictool {
	public void go()
	{
		System.out.println("骑自行车去火车站");
	}
}

package traffic;

public class bus extends traffictool{
	public void go()
	{
		
		System.out.println("坐公交车去火车站");
	}
}
package traffic;
//接口文件
public interface enter //只能写抽象方法
{
	
	public void go();///在接口中默认为抽象方法，不需要加abstract
}


package traffic;

public class highway extends traffictool {
	public void go()
	{
	
		System.out.println("坐高铁去火车站");	
	}
}


package traffic;

public class taxi implements enter //"必须"要"重写"接口中"所有"的抽象方法
{
	public void go()
	{
		System.out.println("打出租去火车站");
	}
}

package traffic;
public class test2 {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		traffictool tt =new bus();
		tt.go();
     //用接口实现多态
	enter e1=new taxi();
	e1.go();
	}
}