這個(gè)算實(shí)現(xiàn)多態(tài)了嗎？
package?text;
public?class?Vehicle?{
public?String?name;
public?String?tWay;
public?int?tNum;
public?void?show()?{
System.out.println("父類方法不會(huì)執(zhí)行！");
}
}
package?text;
public?class?Steamship?extends?Vehicle?{
public?Streamship(){
name?=?"輪船";
tNum?=?400;
tWay?=?"海上";
}
public?void?show()?{
System.out.println(name?+?"在"?+?tWay?+?",可以運(yùn)輸"?+?tNum?+?"人。");
}
}
package?text;
public?class?InitialVehicle?{
public?static?void?main(String[]?args)?{
Vehicle?s=new?Steamship();
s.show();
}
}另外兩個(gè)飛機(jī)和公車的子類是一樣的就不貼上來了。
2019-08-07
是的，在main方法中，
Vehicle?s=new?Steamship();父類引用指向子類對(duì)象，即引用多態(tài)；s.show(); 創(chuàng)建了子類對(duì)象后調(diào)用了子類重寫的方法，即方法多態(tài)。