父類traffic
package?cn.edu.aufe.trafficdemol;

public?class?Traffic?{
	public?int?useage;
	public?String?usename;
	
	public?Traffic(){
		useage=10;
		usename="xiaoming";
	}
	public?void?traffic(){
		System.out.println("交通工具具有運輸的功能。其使用者為"+usename+";使用年限為"+useage);
	}
}
子類1：Car類
package?cn.edu.aufe.trafficdemol;

public?class?Car?extends?Traffic?{
	public?void?traffic(){
		System.out.println("Car在陸地上運輸。其使用者為"+usename+";使用年限為"+useage);
	}
}
子類2：Ship類
package?cn.edu.aufe.trafficdemol;

public?class?Ship?extends?Traffic?{
	public?void?traffic(){
		System.out.println("Ship在海洋上運輸。其使用者為"+usename+";使用年限為"+useage);
	}
}
子類3：AIplane類
package?cn.edu.aufe.trafficdemol;

public?class?Airplane?extends?Traffic?{
	public?void?traffic(){
		System.out.println("Airplane在天空中運輸。其使用者為"+usename+";使用年限為"+useage);
	}
}
主函數：
package?cn.edu.aufe.trafficdemol;

public?class?Initial?{

	public?static?void?main(String[]?args)?{
		//?TODO?Auto-generated?method?stub
		Traffic?tf=new?Traffic();
		tf.traffic();
		Traffic?car=new?Car();
		car.useage=20;
		car.usename="benyl";
		car.traffic();
		Ship?ship=new?Ship();
		ship.useage=40;
		ship.traffic();
		Traffic?airplane=new?Airplane();
		airplane.usename="alexwang";
		airplane.traffic();
	}

}