一開始看到不止的題目沒有頭緒，參照了前輩們的答案才做出來，修修改改了好久總算達成了跟課程老師的題目差不多的要求，和自己加的一些交互代碼。

幫小弟提下意見或者建議 謝謝啦

package?com.imooc;
/*車?父類*/
public?class?Car?{?
	protected??String?carName;?//車名
	protected??int?money;?//價格
	protected??int?seatNum;?//座位數(shù)
	protected??double?weigthNum;?//載貨量?直接用了double類型
	private??double?toMoney=0;?//總價格
	private??int?toSeat=0;?//總座位
	private??int?toWeigth=0;?//總載重
	private?int?day=1;?//租車天數(shù)
	
	public?Car(String?newCarName,int?newMoney,int?newSeatNum,double?NewWeigthNum)?{
????????????this.carName=newCarName;
	??this.money=newMoney;		
	??this.seatNum=newSeatNum;		
	??this.weigthNum=NewWeigthNum;
	?}
	?
	public?Car()?{
	}
	
	public?String?getCarName()?{
	????return?carName;
	}
	
	public?int?getMoney()?{
	????return?money;
	}
	
	public?int?getSeatNum()?{
	????return?seatNum;
	}
	
	public?double?getWeigthNum()?{
	????return?weigthNum;
	}
	
	public?double?getToMoney()?{
	????return?toMoney;	
	}
	
	public?int?getToSeat()?{
	????return?toSeat;	
	}
	
	public?int?getToWeigth()?{
	????return?toWeigth;
	}
	
	public?int?getDay()?{
	????return?day;	
	}
	
	public?void?show()?{
		if(weigthNum<=0)?{
			System.out.println("\t"+carName+"\t"+money+"元/天\t載人:"+seatNum+"人");
		}		
		else?if(seatNum<=0)?{
			System.out.println("\t"+carName+"\t"+money+"元/天\t載貨:"+weigthNum+"噸");
		}else?{			
		System.out.println("\t"+carName+"\t"+money+"元/天\t載人:"+seatNum+"人?載貨:"+weigthNum+"噸");		
		}	
	}	
}

package?com.imooc;
/*客車?子類*/
public?class?PassCar?extends?Car?{
	public?PassCar(String?newCarName,int?newMoney,int?newSeatNum){
????????????super.carName=newCarName;
????????????super.money=newMoney;
????????????super.seatNum=newSeatNum;
????????}
}

package?com.imooc;
/*皮卡車?子類*/
public?class?PickupCar?extends?Car?{
????public?PickupCar(String?newCarName,int?newMoney,int?newSeatNum,double?weigthNum){
????????super.carName=newCarName;		
????????super.money=newMoney;		
????????super.seatNum=newSeatNum;		
????????super.weigthNum=weigthNum;	
????????}	
}

package?com.imooc;
/*貨車?子類*/
public?class?TruckCar?extends?Car?{		
????public?TruckCar(String?newCarName,int?newMoney,double?weigthNum){		
????????super.carName=newCarName;		
????????super.money=newMoney;		
????????super.weigthNum=weigthNum;	
????????}
}?	

1. package com.imooc;

2. import java.util.*;

3. /*運行類*/

4. public class Initail {

5. public static void main(String[] args) {

6. Scanner input = new Scanner(System.in);

7. System.out.println("***歡迎使用答答租車系統(tǒng)***");

8. System.out.println("您是否要租車？輸入數(shù)字\t1是，2否"); //判斷是否要租車

9. Car carVa=new Car();

10. int toSeat=carVa.getToSeat(); //定義車總座位數(shù)

11. double toWeigth=carVa.getWeigthNum(); //定義值車總載重數(shù)

12. double toMoney=carVa.getMoney(); //定義總價格?

13. int day=carVa.getDay();

14. int carType=0; //定義選擇的車序號

15. int maxC=999; //定義最大租車數(shù)量

16. 
    

17. for(int tf=3;tf>=0;tf--) {?

18. int confirmInt=input.nextInt(); //輸入數(shù)字判斷是否要租車

19. 
    

20. if(confirmInt==1) {

21. tf=-1; //結(jié)束外層租車需求循環(huán)判斷 18行

22. 
    

23. Car car[]={

25. new PassCar("奧迪A4",500,4),

26. new PassCar("馬自達6",400,4),

27. new PassCar("金龍",800,20),

28. new PickupCar("皮卡雪6",450,4,2),

29. new TruckCar("松花江",400,4),

30. new TruckCar("依維柯",1000,20),

31. };

32. 
    

33. System.out.println("序號"+"\t"+"汽車名稱"+"\t"+"租金"+"\t"+"容量");

34. for(int c=0,d=1;c<car.length;c++,d++) { //顯示租車列表

35. System.out.print(d+".");

36. car[c].show();

37. }

38. 
    

39. int carNum=3; //定義租車數(shù)量

40. System.out.println("請輸入您要租車的數(shù)量");

41. for(int tfNum=3;tfNum>=0;tfNum--) { //循環(huán)最大租車數(shù)量

42. carNum=input.nextInt();?

43. String carN[]=new String[carNum]; //定義數(shù)組,保存選擇后的車輛-車名

44. int carS[]=new int[carNum]; //定義數(shù)組,保存選擇后的車輛-座位數(shù)

45. double carW[]=new double[carNum]; //定義數(shù)組,保存選擇后的車輛-載重數(shù)

46. List<String> listS = new ArrayList<String>();?

47. List<String> listW = new ArrayList<String>();?

48. if(carNum>0&&carNum<=maxC) { //判斷租車數(shù)量.小于max=999, 進入選車循環(huán)

49. tfNum=-1;

50. 
    

51. for(int i=1,tfNo=3;i<=carNum;) {

52. System.out.println("請輸入第"+i+"輛車的序號,輸入"+"[ 0 ]"+"直接進入下一步租車天數(shù)界面");

53. carType=input.nextInt(); //選擇車序號

54. if(carType<=car.length&&carType>0) { //如果輸入的車序號小于車輛數(shù)據(jù)總長度

55. tfNo=3;

56. toMoney=toMoney+car[carType-1].getMoney(); //計算總價格?

57. toSeat=toSeat+car[carType-1].getSeatNum(); //計算總座位/載人數(shù)

58. toWeigth=toWeigth+car[carType-1].getWeigthNum(); //計算總載重數(shù)

59. carS[i-1]=car[carType-1].getSeatNum(); //保存我們選擇的車座位數(shù)為數(shù)組

60. carW[i-1]=car[carType-1].getWeigthNum();//保存我們選擇的車載重為數(shù)組

61. carN[i-1]=car[carType-1].getCarName(); //保存我們選擇的車名為數(shù)組

62. i++;

63. if(i<carNum) {

64. //顯示租車列表

65. System.out.println("序號"+"\t"+"汽車名稱"+"\t"+"租金"+"\t"+"容量");

66. for(int c=0,d=1;c<car.length;c++,d++) {?

67. System.out.print(d+".");

68. car[c].show();

69. }

70. }

71. }

72. else {

73. if(tfNo>0&&carType!=0) {

74. //顯示租車列表

75. System.out.println("序號"+"\t"+"汽車名稱"+"\t"+"租金"+"\t"+"容量");

76. for(int c=0,d=1;c<car.length;c++,d++) {?

77. System.out.print(d+".");

78. car[c].show();

79. }

82. System.out.println();

83. System.out.println("輸入錯誤！此序號的車輛不存在,還可輸入"+tfNo+"次。");

84. tfNo--;

85. }

86. else if(tfNo<=0) {

87. System.out.println("輸入的租車數(shù)量,錯誤次數(shù)已達3次,退出租車界面");

88. break;

89. }

90. }

92. //判斷車輛完選擇之后

93. if(i>carNum||carType==0) {?

94. 
    

95. System.out.println("請輸入租車天數(shù):");

96. day=input.nextInt();

97. if(day>0) { //判斷租車天數(shù)

98. System.out.println("您的賬單:");

99. System.out.println("***可載人的車有:");

100. for(int s=0;s<carN.length;s++) {

101. if(!listS.contains(carN[s])) { //判斷重復(fù)值

102. if(carS[s]>0) { //判斷座位數(shù)大于0

103. listS.add(carN[s]); //加到list

104. }

105. }

106. }

107. System.out.print(listS); //輸出去重復(fù)值后的車

109. if(toSeat<=0) { //判斷有沒有選擇客車

110. System.out.println("無");

111. }else {

112. System.out.println("\t總載人:"+toSeat+"人");

113. }

114. System.out.println("***可載貨的車有:");

115. for(int w=0;w<carN.length;w++) {

116. if(!listW.contains(carN[w])) { //判斷重復(fù)值

117. if(carW[w]>0) { //判斷座位數(shù)大于0

118. listW.add(carN[w]); //加到list

119. }

120. }

121. }

122. System.out.print(listW); //輸出 去重復(fù)值 后的車

124. if(toWeigth<=0) { //判斷有沒有選擇貨車

125. System.out.println("無");

126. }else {

127. System.out.println("\t總載貨:"+toWeigth+"噸");

128. }

129. System.out.println("租車總價格:"+toMoney*day+"元");

130. }else {

131. int tfDay=3;

132. System.out.println("租車天數(shù)錯誤,請重新輸入：");

133. while(tfDay>=0) {

134. day=input.nextInt();

135. tfDay--;

136. }

137. if(tfDay<=0) {

138. System.out.println("輸入租車天數(shù)錯誤次數(shù)已達最大值,默認給您選擇租車天數(shù)為1天");

139. day=1;

140. }

141. }

142. if(carType==0) {

143. break;

144. }

145. }

147. }

148. }

149. else{

150. if(tfNum>0) {

151. System.out.println("輸入錯誤！租車數(shù)量需要在1-"+maxC+"之間，還可輸入"+tfNum+"次。");

152. System.out.println("請重新輸入租車數(shù)量：");

153. }

154. else if(tfNum<=0) {

155. System.out.println("輸入的租車數(shù)量,錯誤次數(shù)已達3次,退出租車界面");

156. break;

157. }

159. }

160. }

161. }

162. else if(confirmInt==2) {

163. System.out.println("您選擇了否,感謝使用!");

164. break;

166. }

167. else if(confirmInt!=1||confirmInt!=2){

168. if(tf>0) {

169. System.out.println("輸入錯誤！還可輸入"+tf+"次。");

170. System.out.println("輸入數(shù)字選擇您是否要租車？ 1是，2否");

171. }

172. else if(tf<=0) {

173. System.out.println("輸入需求錯誤次數(shù)已到達3次,退出租車界面。");

175. }

176. }

177. }

178. }

179. 
     

180. }