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用了兩種方法寫了，大家看看。

package?com.DADAzuche;

import?java.util.ArrayList;
import?java.util.Scanner;

public?class?DADArentcar
{
	public?static?void?main(String[]?args)
	{
		Car[]?car?={new?Normalcar(1,"奧迪A4",500,4),new?Normalcar(2,"馬自達6",400,4)
		,new?Pickup(3,"皮卡",450,4,2),new?Normalcar(4,"蘇州金龍",800,50)
		,new?Lorry(5,"躍進",400,4),new?Lorry(6,"依維柯",999,20)};
		
		System.out.println("\t****歡迎您使用嗒嗒租車系統****");
		
		System.out.println();
		
		System.out.println("1.進入系統，2.退出系統");
		
		Scanner?in?=?new?Scanner(System.in);
		
		int?str?=?in.nextInt();
		
		if(str==1)
		{
			System.out.println("\t****歡迎您進入嗒嗒租車系統****");
			System.out.println();
			System.out.println("租車信息列表如下：");
			System.out.println("序號\t\t汽車名稱\t\t租金\t\t容量：");
			for(int?i?=?0;i<car.length;i++)
			{
				car[i].show();
			}
			
			System.out.println();
			
			System.out.println("請輸入你要租的汽車數量：");
		
			int?number?=?in.nextInt();
			
			System.out.println();
			
			System.out.println("請輸入你要租車的序號：");
			
			System.out.println();
			
			ArrayList<Car>?al?=?new?ArrayList<Car>();

			for(int?i?=?0?;i<number;i++)
			{
				System.out.println("請輸入第"+(i+1)+"輛車的序號");
				int?num?=?in.nextInt();
				for(int?x=0;x<car.length;x++)
				{
					if(num==car[x].getID())
					al.add(car[x]);
				}
			}
	
			System.out.println("請輸入您租車的天數：");
			
			int?Rentday?=?in.nextInt();
			
			System.out.println();
			
			System.out.println("租車清單如下，請認真核對：");
			
			System.out.println();
			
			System.out.println("可載人的車：");
			
			int?Allprice?=?0;
			
			int?ALLBusload?=?0;
			
			int?ALLBoatload?=?0;
			
			for(int?i=0;i<al.size();i++)
			{
				if(al.get(i)instanceof?Normalcar)
				{
					System.out.print(al.get(i).getCarname()+"?");
					Allprice+=al.get(i).getPrice();
					ALLBusload+=((Normalcar)?al.get(i)).getBusload();
				}
				else?if(al.get(i)instanceof?Pickup)
				{
					System.out.print(al.get(i).getCarname()+"?");
					Allprice+=al.get(i).getPrice();
					ALLBusload+=((Pickup)?al.get(i)).getBusload();
				}
			}
			
			System.out.println("???總可載人數："+ALLBusload+"人");
			
			System.out.println();
			
			System.out.println();
			
			System.out.println("可載貨的車：");
					
			for(int?i=0;i<al.size();i++)
			{
				if(al.get(i)instanceof?Pickup)
				{
					System.out.print(al.get(i).getCarname()+"?");
					ALLBoatload+=?((Pickup)?al.get(i)).getBoatload();
				}
				else?if(al.get(i)instanceof?Lorry)
				{
					System.out.print(al.get(i).getCarname()+"?");
					ALLBoatload+=?((Lorry)?al.get(i)).getBoatload();
					Allprice+=al.get(i).getPrice();
				}
			}
			System.out.println("???總可載貨物："+ALLBoatload+"噸");
			System.out.println();
			
			System.out.println("一共需付的金額為："+Allprice*Rentday);
		}
		else?if(str==0)
		{
			System.exit(5);
		}
		in.close();
	}
}


package?com.DADAzuche;

public?abstract?class?Car
{
	protected?int?ID;
	protected?String?Carname;
	protected?int?Price;
	public?Car(int?iD,?String?carname,?int?price)?{
		super();
		this.ID?=?iD;
		this.Carname?=?carname;
		this.Price?=?price;
	}
	
	public?int?getID()?{
		return?ID;
	}

	public?void?setID(int?iD)?{
		ID?=?iD;
	}

	public?String?getCarname()?{
		return?Carname;
	}

	public?void?setCarname(String?carname)?{
		Carname?=?carname;
	}

	public?int?getPrice()?{
		return?Price;
	}

	public?void?setPrice(int?price)?{
		Price?=?price;
	}

	public?abstract?void?show();
	
}


package?com.DADAzuche;

public?class?Normalcar?extends?Car?
{
	private?int?Busload;
	

	public?Normalcar(int?iD,?String?carname,?int?price,?int?busload)?{
		super(iD,?carname,?price);
		Busload?=?busload;
	}
	


	public?int?getBusload()?{
		return?Busload;
	}



	public?void?setBusload(int?busload)?{
		Busload?=?busload;
	}



	@Override
	public?void?show()?
	{
		System.out.println(ID+"\t\t"+Carname+"\t\t"+Price+"元/天"+"\t\t"+Busload+"人");
	}
}


package?com.DADAzuche;

public?class?Lorry?extends?Car
{
	private?int?Boatload;
	public?Lorry(int?iD,?String?carname,?int?price,int?Boatload)?{
		super(iD,?carname,?price);
		this.Boatload?=?Boatload;
	}
	
	public?int?getBoatload()?{
		return?Boatload;
	}

	public?void?setBoatload(int?boatload)?{
		Boatload?=?boatload;
	}

	@Override
	public?void?show()?{
		System.out.println(ID+"\t\t"+Carname+"\t\t"+Price+"元/天"+"\t\t"+Boatload+"噸");
	}?
}



package?com.DADAzuche;

public?class?Pickup?extends?Car
{
	private?int?Busload;
	private?int?Boatload;
	
	public?Pickup(int?iD,?String?carname,?int?price,?int?busload,?int?boatload)?{
		super(iD,?carname,?price);
		this.Busload?=?busload;
		this.Boatload?=?boatload;
	}

	
	public?int?getBusload()?{
		return?Busload;
	}


	public?void?setBusload(int?busload)?{
		Busload?=?busload;
	}


	public?int?getBoatload()?{
		return?Boatload;
	}


	public?void?setBoatload(int?boatload)?{
		Boatload?=?boatload;
	}


	@Override
	public?void?show()
	{
		System.out.println(ID+"\t\t"+Carname+"\t\t"+Price+"元/天"+"\t\t"+Busload+"人"+","+Boatload+"噸");
	}
}




/*************************************************************************/
package?嗒嗒租車系統;

import?java.util.ArrayList;
import?java.util.Arrays;
import?java.util.Scanner;
class?CAR?//小汽車，只可以多載人
{
	private?String?Carname;
	private?int?Price;
	private?int?Busload;
	public?CAR(String?carname,?int?price,?int?busload)?{
		super();
		Carname?=?carname;
		Price?=?price;
		Busload?=?busload;
	}
	public?int?getBusload()?{
		return?Busload;
	}
	public?void?setBusload(int?busload)?{
		Busload?=?busload;
	}
	public?String?getCarname()?{
		return?Carname;
	}
	public?void?setCarname(String?carname)?{
		Carname?=?carname;
	}
	public?int?getPrice()?{
		return?Price;
	}
	public?void?setPrice(int?price)?{
		Price?=?price;
	}
	
}

class?Lorry?//卡車只可以多載貨
{
	private?String?name;
	private?int?Price;
	private?int?Boatload;
	
	public?Lorry(String?name,?int?price,?int?boatload)?{
		super();
		this.name?=?name;
		Price?=?price;
		Boatload?=?boatload;
	}
	public?String?getName()?{
		return?name;
	}
	public?void?setName(String?name)?{
		this.name?=?name;
	}
	public?int?getPrice()?{
		return?Price;
	}
	public?void?setPrice(int?price)?{
		Price?=?price;
	}
	public?int?getBoatload()?{
		return?Boatload;
	}
	public?void?setBoatload(int?boatload)?{
		Boatload?=?boatload;
	}
	
}
class?Pickup?//皮卡車，又可以載貨又可以多載人
{
	private?String?name;
	private?int?Price;
	private?int?Busload;
	private?int?Boatload;
	public?Pickup(String?name,?int?price,?int?busload,?int?boatload)?{
		super();
		this.name?=?name;
		Price?=?price;
		Busload?=?busload;
		Boatload?=?boatload;
	}
	public?String?getName()?{
		return?name;
	}
	public?void?setName(String?name)?{
		this.name?=?name;
	}
	public?int?getPrice()?{
		return?Price;
	}
	public?void?setPrice(int?price)?{
		Price?=?price;
	}
	public?int?getBusload()?{
		return?Busload;
	}
	public?void?setBusload(int?busload)?{
		Busload?=?busload;
	}
	public?int?getBoatload()?{
		return?Boatload;
	}
	public?void?setBoatload(int?boatload)?{
		Boatload?=?boatload;
	}
	
}
public?class?DADAZUZUCHE?
{
	public?static?void?main(String[]?args)?
	{
		System.out.println("歡迎使用租車系統：");
		Scanner?input?=?new?Scanner(System.in);
		System.out.println("您是否要租車？1/0(是/不是)");
		try
		{
			int?select?=?input.nextInt();
			if(select==1)
			{
				System.out.println("****歡迎進入租車系統****");
				System.out.println("下面是您可以租車的類型和價目表");			
				CarType();
				Zuchenumber();
			}
			else
				System.out.println("歡迎下次光臨！正在退出系統....");
				System.exit(5);
			input.close();
		}
		catch(RuntimeException?e)
		{
			throw?new?RuntimeException("輸入的數據?類型不正確！");
		}
	
	}

	public?static?void?Zuchenumber()
	{
		System.out.println();
		System.out.println("請輸入您要租車的數量：");
		Scanner?input?=?new?Scanner(System.in);
		int?num?=?input.nextInt();
		zucheType(num);
		System.out.println();
		input.close();
	}

	public?static?void?zucheType(int?num)
	{
		ArrayList<Object>?al?=?new?ArrayList<Object>();
		Scanner?input?=?new?Scanner(System.in);
		for(int?i=0;i<num;i++)
		{
			System.out.println("請輸入你要租的第"+(i+1)+"車的序號：");
			int?number?=?input.nextInt();
			al.add(selectCar(number));
		}
		Arrays.asList(al);
		ZuCheList(al);
		input.close();
	}

	private?static?void?ZuCheList(ArrayList<Object>?al)
	{
		System.out.println("請輸入要租車的天數");
		Scanner?input?=?new?Scanner(System.in);
		int?day?=?input.nextInt();
		System.out.println();
		System.out.println("租車清單為：");
		System.out.println();
		System.out.println("\t****可以載人的車有****");
		int?CARload?=?0;
		int?Pickupload?=?0;
		int?ALLprice=0;
		for(int?i=0;i<al.size();i++)
		{
			if(al.get(i)instanceof?CAR)
			{
				CAR?a?=?(CAR)?al.get(i);
				System.out.print(a.getCarname()+"?");
				CARload+=a.getBusload();
				ALLprice+=a.getPrice();

			}
			if(al.get(i)instanceof?Pickup)
			{
				Pickup?c?=?(Pickup)?al.get(i);
				System.out.print(c.getName()+"?");
				Pickupload+=c.getBusload();
				ALLprice+=c.getPrice();
			}
		}
		System.out.println("總載人數："+(CARload+Pickupload)+"人");
		System.out.println();
		System.out.println();
		System.out.println("****可以載貨的車有****");
		int?LorryBoatload=0;
		int?PKBoatload=0;
		for(int?i=0;i<al.size();i++)
		{
		????if(al.get(i)instanceof?Lorry)
			{
				Lorry?b?=??(Lorry)?al.get(i);
				System.out.print(b.getName()+"?");
				LorryBoatload+=b.getBoatload();
				ALLprice+=b.getPrice();

			}
		????if(al.get(i)instanceof?Pickup)
			{
				Pickup?c?=?(Pickup)?al.get(i);
				System.out.print(c.getName()+"?");
				PKBoatload+=c.getBoatload();
			}
		????
		}
		System.out.println("總載貨量："+(LorryBoatload+PKBoatload)+"噸");
		System.out.println();
		System.out.println("****租車總價格****"+(ALLprice*day)+"元");
		input.close();
	}

	public?static?Object?selectCar(int?number)?
	{
		switch(number)
		{
		case?1:return?new?CAR("奧迪A4",500,4);?
		case?2:return?new?CAR("馬自達6",400,4);?
		case?3:return?new?Pickup("皮卡車",450,4,20);?
		case?4:return?new?CAR("蘇州金龍",800,20);?
		case?5:return?new?Lorry("躍進",400,4);
		case?6:return?new?Lorry("依維柯",1000,20);
		default:System.out.println("您輸入的車號不存在！！");
		}
		return?null;
	}

	public?static?void?CarType()
	{
		System.out.println("序號\t\t汽車名稱\t\t租金\t\t容量：");
		System.out.println();
		System.out.println("1\t\t奧迪A4\t\t500元/天\t\t載人:4人");
		System.out.println();
		System.out.println("2\t\t馬自達6\t\t400元/天\t\t載人:4人");
		System.out.println();
		System.out.println("3\t\t皮卡車\t\t450元/天\t\t載人:4人,載貨:20噸");
		System.out.println();
		System.out.println("4\t\t蘇州金龍\t\t800元/天\t\t載人:20人");
		System.out.println();
		System.out.println("5\t\t躍進\t\t400元/天\t\t載貨:4噸");
		System.out.println();
		System.out.println("6\t\t依維柯\t\t1000元/天\t載貨:20噸");
	}
}



正在回答

3 回答

?Car[]?car?={new?Normalcar(1,"奧迪A4",500,4),new?Normalcar(2,"馬自達6",400,4)

????????,new?Pickup(3,"皮卡",450,4,2),new?Normalcar(4,"蘇州金龍",800,50)

????????,new?Lorry(5,"躍進",400,4),new?Lorry(6,"依維柯",999,20)};

不明白這句？求解答

0 回復 有任何疑惑可以回復我~

在eclipse?里有報錯。。

0 回復 有任何疑惑可以回復我~

都沒講到過ArrayList的用法啊

2 回復 有任何疑惑可以回復我~

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Java入門第二季 升級版
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課程升級！以終為始告別枯燥，在開發和重構中體會Java面向對象編程的奧妙

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用了兩種方法寫了，大家看看。

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