//父類
package?com.sc;

public?abstract?class?Car?{
	public?String?carName;
	public?float?carPrice;
	public?int?carWeight;
	public?int?carPerson;
	
	public?String?getCarName()?{
		return?carName;
	}
	public?void?setCarName(String?carName)?{
		this.carName?=?carName;
	}
	public?float?getCarPrice()?{
		return?carPrice;
	}
	public?void?setCarPrice(float?carPrice)?{
		this.carPrice?=?carPrice;
	}
	public?int?getCarWeight()?{
		return?carWeight;
	}
	public?void?setCarWeight(int?carWeight)?{
		this.carWeight?=?carWeight;
	}
	public?int?getCarPerson()?{
		return?carPerson;
	}
	public?void?setCarPerson(int?carPerson)?{
		this.carPerson?=?carPerson;
	}
	public?abstract?void?info();
}

//小汽車客車
package?com.sc;
public?class?PassgerCar?extends?Car?{
public?PassgerCar(String?carName,float?carPrice,int?carPerson){
this.carName?=?carName;
this.carPerson?=?carPerson;
this.carPrice?=?carPrice;
}?
@Override
public?void?info()?{
System.out.println(getCarName()?+?'\t'?+getCarPrice()?+"元/天"?+?'\t'?+?"載人："+getCarPerson()?+"人");
}
}

//貨車
package?com.sc;
public?class?TrunkCar?extends?Car?{
public?TrunkCar(String?carName,float?carPrice,int?carWeight)?{
this.carName?=?carName;
this.carWeight?=?carWeight;
this.carPrice?=?carPrice;
}
@Override
public?void?info()?{
//?TODO?自動生成的方法存根
System.out.println(getCarName()?+?'\t'?+getCarPrice()?+"元/天"?+?'\t'?+?"載重："+getCarWeight()?+"噸");
}
}

//皮卡
package?com.sc;

public?class?PickupCar?extends?Car?{
	public?PickupCar(String?carName,float?carPrice,int?carPerson,int?carWeight)?{
		this.carName?=?carName;
		this.carPerson?=?carPerson;
		this.carWeight?=?carWeight;
		this.carPrice?=?carPrice;
	}
	
	@Override
	public?void?info()?{
		//?TODO?自動生成的方法存根
		System.out.println(getCarName()?+?'\t'?+getCarPrice()?+"元/天"?+?'\t'?+?
				"載人："+getCarPerson()?+"人"+?"??載貨："+getCarWeight()?+"噸");
	}

}

//測試代碼
package?com.sc;

import?java.util.*;

public?class?DiDi?{

	public?static?void?main(String[]?args)?{
		Car[]?allCar?=?{new?PassgerCar("奧迪A4",500,4),new?PassgerCar("馬自達6",400,4),new?PickupCar("皮卡雪6",450,4,2)
		,new?PassgerCar("金龍??",800,20),new?TrunkCar("松花江",400,4),new?TrunkCar("依維河",1000,20)};
		System.out.println("歡迎使用XX租車系統！！");
		System.out.println("您是否需要租車：1.是?|2.否");
		
		Scanner?scanner?=?new?Scanner(System.in);
		int?num?=?scanner.nextInt();
		
		while?(num?!=?1?||?num?!=2)?{
			if?(num?==?1)?{
				System.out.println("***************************");
				System.out.println("我們為您準備的車輛類型和價格如下：");
				System.out.println("序號"?+?'\t'?+?"汽車名稱"?+?'\t'?+?"租金"?+?'\t'?+"容量");
				for?(int?j?=?0;?j?<allCar.length?;?j++)?{
					System.out.print((j+1)?+?".\t"?);
					allCar[j].info();
				}
				break;
			}?else?if?(num?==?2)?{
				System.out.println("謝謝您的使用，再見！");
				System.exit(0);
			}else?{
				System.out.println("輸入不正確,請重新輸入！");
				System.out.println("您是否需要租車：1.是?|2.否"+'\n');
				num?=?scanner.nextInt();
			}		
		}
		System.out.println("請輸入您要租車的序號：");
		int?num1?=?scanner.nextInt();
		while(num1?>?0){
			if?(num1?>?0?&&?num1?<=?allCar.length)?{
				System.out.println("您選擇的是第"+?num1?+"輛車,"+?allCar[num1-1].getCarName()?+
							",租金為："+allCar[num1-1].getCarPrice()+?"元/天。");	
				System.out.println("請輸入你想租車的天數：");
				int?day?=?scanner.nextInt();
				float?rentPrice?=?allCar[num1-1].getCarPrice()?*?day;
				System.out.println("您應付的租金為："?+?rentPrice?+?"元。"?);	
				System.exit(0);
			}?else{
				System.out.println("輸入車輛序號不正確，請重新輸入！");
				System.out.println("請輸入您要租車的序號："+'\n');
				num1?=?scanner.nextInt();
			}
		}
			
			
	
		
	}


}

求指導，第一次寫，費勁，很多含糊的地方。