1 package chapter5;
2 import java.util.*;
3
4 public class MiniDVD {
5 public static void main(String[] args){
6 //扫描器
7 Scanner input = new Scanner(System.in);
8 //重要参数及初始化
9 //Create four arrays with length of 7
10 //定义四个数组长度为7
11 int date[] = new int[7]; //borrow date
12 int count[] = new int[7]; //total count
13 String name[] =new String[7]; //name of DVDs
14 String state[] = new String[7]; //state
15 //Initiate three DVD
16 //FirstDVD
17 name[0] = "罗马假日";
18 state[0] = "已借出";
19 date[0] = 1;
20 count[0] =15;
21 //Second DVD
22 name[1] = "风声鹤唳";
23 state[1] = "可借";
24 date[1] = 0;
25 count[1] =12;
26 //Third DVD
27 name[2] = "浪漫满屋";
28 state[2] = "可借";
29 date[2] = 0;
30 count[2] =30;
31
32 //循环进入条件
33 String choice = " ";
34 boolean flag = true;
35 do{
36 //Create DVD Menu
37 System.out.println("欢迎使用迷你DVD管理器");
38 System.out.println("------------------------------------------------------");
39 System.out.println("1.新增DVD");
40 System.out.println("2.查看DVD");
41 System.out.println("3.删除DVD");
42 System.out.println("4.借出DVD");
43 System.out.println("5.归还DVD");
44 System.out.println("6.退出DVD");
45 System.out.println("------------------------------------------------------");
46 System.out.print("请选择：");
47 choice = input.next();
48
49 //Switch choice menu
50 switch (choice){
51 case "1":
52 System.out.println("--->新增DVD");
53 System.out.print("\n请输入DVD名称：");
54 boolean firstMonitor = true;
55 boolean secondMonitor = false;
56 String bookName = " ";
57 do{
58 bookName= input.next();
59 if(firstMonitor){
60 for(int i = 0; i<name.length; i++){
61 if(bookName.equals(name[i])){
62 System.out.println("货架上已经存在该DVD，请返回目录重新选择！");
63 secondMonitor = true;
64 break;
65 }
66 }
67 }
68 firstMonitor =false;
69 }while(firstMonitor);
70
71 if(!secondMonitor){
72 for (int j = 0;j<name.length; j++){
73 if((name[j])==null){
74 name[j]= bookName;
75 state[j] = "可借";
76 count[j] = 0;
77 System.out.println("新增《"+bookName+"》成功！");
78 System.out.println("***************************");
79 break;
80 }
81 if(name[name.length-2] !=null){
82 System.out.println("DVD货架已满，添加失败！");
83 System.out.println("***************************");
84 break;
85 }
86 }
87 }
88 break;
89 case "2":
90 System.out.println("--->查看DVD");
91 System.out.println("序号\t状态\t名称\t\t借出日期\t借出次数");
92 for (int i = 0; i<name.length; i++){
93 if(name[i] == null){
94 System.out.println("***************************");
95 break;
96 }
97 String myDate = " ";
98 if(date[i] != 0){
99 myDate = date[i]+"日";
100 }
101 System.out.println((i+1)+"\t"+state[i]+"\t"+"《"+name[i]+"》"+"\t"+myDate+"\t"+count[i]+"次");
102 }
103 break;
104 case "3":
105 System.out.println("--->删除DVD");
106 System.out.print("\n请输入DVD名称：");
107 String delName = input.next();
108 //define index monitor: check
109 int check = -1;
110 for(int i = 0; i < name.length; i++){
111 if(delName.equals(name[i])){
112 check = i;
113 break;
114 }
115 }
116 if(check != -1){
117 if(state[check].equals("可借")){
118 //Delete operation
119 for(int j = check; j < name.length-1; j++){
120 name[j] = name[j+1];
121 state[j] = state[j+1];
122 date[j] = date[j+1];
123 count[j] = count[j+1];
124 }
125 System.out.println("删除《"+delName+"》成功！");
126 System.out.println("***************************");
127 break;
128 }else{
129 System.out.println("DVD为借出状态，不允许删除！");
130 System.out.println("***************************");
131 }
132 }else{
133 System.out.println("没有找到匹配信息！");
134 System.out.println("***************************");
135 }
136 break;
137 case "4":
138 System.out.println("--->借出DVD");
139 System.out.print("\n请输入DVD名称：");
140 String lendName = input.next();
141 //Initiate lendDate with 1, so as to enter the do-loop
142 int lendDate = 1;
143 System.out.print("请输入借出日期：");
144 //Avoid user input wrong date
145 do{
146 lendDate = input.nextInt();
147 if((lendDate<1)||(lendDate>31)){
148 System.out.print("必须输入大于等于1且小于等于31的数字，请重新输入：");
149 }
150 }while((lendDate<1)||(lendDate>31));
151
152 //define index monitor
153 int index = -1;
154 for(int i = 0; i < name.length; i++){
155 if(lendName.equals(name[i])){
156 index = i;
157 break;
158 }
159
160 }
161 //lend operation
162 if(index != -1){
163 if(state[index].equals("可借")){
164 state[index] = "已借出";
165 count[index] +=1;
166 date[index] = lendDate;
167 System.out.println("借出《"+lendName+"》成功！");
168 System.out.println("***************************");
169 }else{
170 System.out.println("《"+lendName+"》已被借出！");
171 System.out.println("***************************");
172 }
173 }else{
174 System.out.println("没有找到匹配信息！");
175 System.out.println("***************************");
176 }
177 break;
178 case "5":
179 System.out.println("--->归还DVD");
180 System.out.print("\n请输入DVD名称：");
181 String returnName = input.next();
182 //define index monitor
183 int monitor = -1;
184 for(int i = 0; i < name.length; i++){
185 if(returnName.equals(name[i])){
186 monitor = i;
187 break;
188 }
189
190 }
191 //Initiate myLendPeriod with 0, and enter the do-loop
192 int returnDate = 0;
193 int myLendPeriod = 0;
194 do{
195 System.out.print("请输入归还日期：");
196 //Avoid user input wrong date
197 do{
198 returnDate = input.nextInt();
199 if(monitor != -1){
200 myLendPeriod = returnDate - date[monitor];
201 }
202 if(returnDate > 31){
203 System.out.print("一个月只有31天，请重新输入：");
204 }
205 if(myLendPeriod < 0){
206 System.out.println("归还日期不能小于借出日期，请重新输入：");
207 }
208 }while((returnDate>31)||(myLendPeriod<0));
209 //Return operation
210 if(monitor != -1){
211 if(state[monitor].equals("已借出")){
212 state[monitor] = "可借";
213 date[monitor] = 0;
214 System.out.println("归还《"+returnName+"》成功！");
215 System.out.println("借出日期为："+date[monitor]+"日");
216 System.out.println("归还日期为："+returnDate+"日");
217 System.out.println("应付租金（元）："+myLendPeriod);
218 System.out.println("***************************");
219 }else{
220 System.out.println("该DVD没有被借出！无法进行归还操作。");
221 System.out.println("***************************");
222 }
223 }else{
224 System.out.println("没有找到匹配信息！");
225 System.out.println("***************************");
226 }
227 break;
228 }while(myLendPeriod < 0);
229 break;
230 case "6":
231 flag = false;
232 break;
233 default:
234 }
235 if(flag){
236 System.out.print("输入任意值返回:");
237 choice = input.next();
238 }
239 }while(flag);
240
241 //program exit
242 System.out.println("程序结束");
243 }
244 }
