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Library management system
2022-07-06 14:16:00 【One skim and one cross】
Preface
I've just started to learn Java, The basic functions of the whole system have been realized , But in terms of code , The code of the whole program is more complex , You can also optimize and improve the code , Yes IO The understanding and mastery of flow is not proficient . In addition, there are many deficiencies in this program and the author's handwriting , Welcome your comments and suggestions .
Text
There are four classes in one package
Overall functional composition and implementation 
UI Class to call the method of system startup
BookInfo Class storage below Book information
ReaderInfo Class storage below Reader information
BookBorrow Class storage below Borrowing query information
Menu and system startup
// Create three classes Arraylist
static ArrayList<BookInfo> booklist = new ArrayList<>();
static ArrayList<ReaderInfo> readlist = new ArrayList<>();
static ArrayList<BookBorrow> borrowlist = new ArrayList<>();
public static void Show()// menu
{
System.out.println("****************************************************************");
System.out.println("——————————————————————— The system starts ———————————————————————————————————");
System.out.println("——————0、 Exit the system ————————————————————————————————————————————————");
System.out.println("——————1、 Add book information （ Book number 、 Title 、 author 、 Press. 、 Number of Libraries 、 pricing ）——————————");
System.out.println("——————2、 Book information inquiry （ According to the book title 、 The author's name 、 Press, etc ———————————————");
System.out.println("——————3、 Book information sorting （ By book number 、 Book titles are sorted in ascending order ）————————————————————");
System.out.println("——————4、 Book information modification 、 Delete （ Modify and delete books by book number or title ）————————————");
System.out.println("——————5、 Add reader information （ Including student ID 、 full name 、 college 、 Professional classes, etc ）—————————————————");
System.out.println("——————6、 Reader information query （ According to the student id 、 full name 、 Professional classes, etc ）—————————————————");
System.out.println("——————7、 Reader information sorting （ According to the student id 、 Colleges, etc. are sorted in ascending order ）—————————————————————");
System.out.println("——————8、 Reader information modification 、 Delete （ According to the student id + Name to modify and delete reader information ）——————————");
System.out.println("——————9、 Book borrowing （ Enter the student id + Book number ）————————————————————————————————————");
System.out.println("——————10、 Book return （ Enter the student id + Book number ）———————————————————————————————————");
System.out.println("——————11、 Book borrowing inquiry （ By student number 、 Title 、 Colleges and so on ）————————————————");
System.out.println("——————————————————————— Please select function items ————————————————————————————");
System.out.println("*****************************************************************");
}
public static void main(String[] args) throws Exception {
Scanner sc = new Scanner(System.in);
InBookInfoFile();
InReaderFile();
InBorrowFile();
while (true) {
Show();
int flag = sc.nextInt();
switch (flag) {
case 0:
OutReader();
OutBookBorrow();
OutBookInformation();
System.out.println(" Exit the book borrowing system ");
System.exit (0);
case 1:
AddBook(); // Add book information
break;
case 2:
PrintBook(booklist);// Book information inquiry
break;
case 3:
SortBook(booklist);// Book information sorting
break;
case 4:
ChangeBook(booklist);// Book information modification
break;
case 5:
AddReader(); // Student information added
break;
case 6:
PrintReader(); // Student information inquiry
break;
case 7:
SortStu();// Student information ranking
break;
case 8:
ChaReStu(); // Modification of student information 、 Delete
break;
case 9:
BorrowBook(); // Book borrowing
break;
case 10:
BackBook();// Book return
break;
case 11:PriBookReader();// Book borrowing 、 Inquire about
break;
default:
System.out.println(" The data is wrong , Please re-enter ");
break;
}
}
}
Refer to the following to establish the corresponding class , Then call the function through the above
The book
Create a Book Class
public class BookInfo {
String BookNum; // Book number
String BookName;// Title
String BookAuthor; // author
String Publisher; // Press.
String PublishTime; // Publication date
int BookCount; // Number of books stored
double Price;// pricing
public BookInfo(String bookNum, String bookName, String bookAuthor, String publisher, String publishTime, int bookCount, double price) {
BookNum = bookNum;
BookName = bookName;
BookAuthor = bookAuthor;
Publisher = publisher;
PublishTime = publishTime;
BookCount = bookCount;
Price = price;
}
public void setBookInfo(String bookNum, String bookName, String bookAuthor, String publisher, String publishTime, int bookCount, double price) {
BookNum = bookNum;
BookName = bookName;
BookAuthor = bookAuthor;
Publisher = publisher;
PublishTime = publishTime;
BookCount = bookCount;
Price = price;
}
public String getBookNum() {
return BookNum;
}
public void setBookNum(String bookNum) {
BookNum = bookNum;
}// The rest can be constructed directly through the editor （ I won't repeat ）
public String toString()// Output entry
{
return (" Book number ：" + BookNum + "\t" + " Title :" + BookName
+ "\t" + " author ：" + BookAuthor + "\t" + " Press. ：" + Publisher
+ "\t" + " Publication date ：" + PublishTime + "\t" + " Number of Libraries ：" + BookCount
+ "\t" + " pricing :" + Price);
}
}
Book information adding function
Including book number 、 Title 、 author 、 Press. 、 Number of Libraries 、 Pricing, etc .
public static void AddBook()// Add book information
{
while (true) {
System.out.println(" At present, there is " + booklist.size() + " A Book of sorts !");
Scanner sc = new Scanner(System.in);
System.out.println(" Please enter the book number ");
String ID = sc.next();
System.out.println(" Please enter the title of the book 、 author 、 Press. 、 Publication date ");
String bookname = sc.next();
String author = sc.next();
String publisher = sc.next();
String publishTime = sc.next();
System.out.println(" Please enter the storage quantity ");
int BookCount = sc.nextInt();
System.out.println(" Please enter the pricing ");
double Price = sc.nextDouble();
BookInfo book = new BookInfo(ID, bookname, author, publisher, publishTime, BookCount, Price);
booklist.add(book);
System.out.println(" Book added successfully ");
System.out.println("1、 Continue to add \t2、 End adding ");
int chioce = sc.nextInt();
if (chioce == 1) {
continue;
}
if (chioce == 2) {
break;
}
}
}
Book information inquiry function
According to the book title , By author's name , Query by publishing house .
public static void PrintBook(ArrayList<BookInfo> booklist)// Book information inquiry
{
Scanner sc = new Scanner(System.in);
while (true) {
int flag = 0;// Mark
System.out.println(" Please select the query method ");
System.out.println("1、 Search by title 2、 Search by author name 3、 Query by publishing house ");
int num1 = sc.nextInt();
switch (num1) {
case 1:
System.out.println(" Please enter the title of the book you are looking for ：");
String bookname = sc.next();
for (int i = 0; i < booklist.size(); i++) {
BookInfo B = booklist.get(i);
if (B.getBookName().equals(bookname)) {
System.out.println(" Book number ：" + B.getBookNum() + "\t" + " Title :" + B.BookName
+ "\t" + " author ：" + B.getBookAuthor() + "\t" + " Press. ：" + B.getPublisher()
+ "\t" + " Publication date ：" + B.getPublishTime() + "\t" + " Number of Libraries ：" + B.getBookCount()
+ "\t" + " pricing :" + B.getPrice());
flag = 1;
}
}
if (flag == 0) {
System.out.println(" There is no such book , Please re-enter ");
}
if (flag == 1) {
System.out.println("1、 Continue checking 2、 sign out ");
int choice = sc.nextInt();
if (choice == 1) {
break;
}
if (choice == 2) {
return;
}
}
break;
case 2:
System.out.println(" Please enter the author name you want to find ：");
String author = sc.next();
for (int i = 0; i < booklist.size(); i++) {
BookInfo B = booklist.get(i);
if (B.getBookAuthor().equals(author)) {
System.out.println(" Book number ：" + B.getBookNum() + "\t" + " Title :" + B.BookName
+ "\t" + " author ：" + B.getBookAuthor() + "\t" + " Press. ：" + B.getPublisher()
+ "\t" + " Publication date ：" + B.getPublishTime() + "\t" + " Number of Libraries ：" + B.getBookCount()
+ "\t" + " pricing :" + B.getPrice());
flag = 1;
}
if (flag == 0) {
System.out.println(" There is no such book , Please re-enter ");
}
if (flag == 1) {
System.out.println("1、 Continue checking 2、 sign out ");
int choice = sc.nextInt();
if (choice == 1) {
break;
}
if (choice == 2) {
return;
}
}
}
break;
case 3:
System.out.println(" Please enter the name of the publisher you are looking for ：");
String publisher = sc.next();
for (int i = 0; i < booklist.size(); i++) {
BookInfo B = booklist.get(i);
if (B.getPublisher().equals(publisher)) {
System.out.println(" Book number ：" + B.getBookNum() + "\t" + " Title :" + B.BookName
+ "\t" + " author ：" + B.getBookAuthor() + "\t" + " Press. ：" + B.getPublisher()
+ "\t" + " Publication date ：" + B.getPublishTime() + "\t" + " Number of Libraries ：" + B.getBookCount()
+ "\t" + " pricing :" + B.getPrice());
flag = 1;
}
if (flag == 0) {
System.out.println(" There is no such book , Please re-enter ");
}
if (flag == 1) {
System.out.println("1、 Continue checking 2、 sign out ");
int choice = sc.nextInt();
if (choice == 1) {
break;
}
if (choice == 2) {
return;
}
}
}
break;
default:
System.out.println(" Incorrect input , Please re-enter ");
break;
}
}
}
Book information sorting
By book number 、 Book titles are sorted in ascending order .
static void SortBook(ArrayList<BookInfo> booklist)// Book information sorting
{
System.out.println(" Please select sort by ");
System.out.println("1、 Sort by book number " + "\t" + "2、 Sort by title ");
Scanner sc = new Scanner(System.in);
int num1 = sc.nextInt();
if (num1 == 1) {
Collections.sort(booklist, ((o1, o2) -> o1.getBookNum().compareTo(o2.getBookNum())));
System.out.println(" Sorting by book number succeeded ");
System.out.println(" The list of books is ：");
for (int i = 0; i < booklist.size(); i++) {
BookInfo B = booklist.get(i);
System.out.println(" Book number ：" + B.getBookNum() + "\t" + " Title :" + B.BookName
+ "\t" + " author ：" + B.getBookAuthor() + "\t" + " Press. ：" + B.getPublisher()
+ "\t" + " Publication date ：" + B.getPublishTime() + "\t" + " Number of Libraries ：" + B.getBookCount()
+ "\t" + " pricing :" + B.getPrice());
}
System.out.println(" Please enter 0 Exit sort ");
if (sc.nextInt() == 0) {
return;
}
}
if (num1 == 2) {
Collections.sort(booklist, ((o1, o2) -> o1.getBookName().compareTo(o2.getBookName())));
System.out.println(" Sorting by book title succeeded ");
System.out.println(" The list of books is ：");
for (int i = 0; i < booklist.size(); i++) {
System.out.println(booklist.get(i).toString());
}
System.out.println(" Please enter 0 Exit sort ");
if (sc.nextInt() == 0) {
return;
}
}
}
Modification of book information 、 Delete
Modify and delete books by book number or title .
public static void ChangeBook(ArrayList<BookInfo> booklist)// Book information modification
{
while (true) {
int flag = 1;// Mark whether there is a corresponding book
System.out.println(" Please select the modification type ");
System.out.println("1、 By book number " + "\t" + "2、 By title ");
Scanner sc = new Scanner(System.in);
int Num1 = sc.nextInt();
if (Num1 == 1) {
System.out.println(" Please enter the book number to be queried ");
String Num2 = sc.next();
for (int i = 0; i < booklist.size(); i++) {
BookInfo B = booklist.get(i);
if (Num2.equals(booklist.get(i).BookNum)) {
flag = 0;// Marked with corresponding books
System.out.println(" The original title of the book is " + booklist.get(i).BookName);
System.out.println(" Please enter the revised book number 、 Title 、 author 、 Press. 、 Number of Libraries 、 pricing ");
B.setBookInfo(sc.next(), sc.next(), sc.next(), sc.next(), sc.next(), sc.nextInt(), sc.nextDouble());
System.out.println(" Modification successful ");
System.out.println("1、 Continue to modify \t2、 End modification ");
int chioce = sc.nextInt();
if (chioce == 1) {
break;
} else if (chioce == 2) {
return;
} else {
System.out.println(" Incorrect input , Continue to modify by default ");
}
}
}
if (flag == 1)
System.out.println(" There is no such book , Please re-enter ");
} else if (Num1 == 2) {
System.out.println(" Please enter the title of the book to be queried ");
String Bookname = sc.next();
for (int i = 0; i < booklist.size(); i++) {
BookInfo B = booklist.get(i);
if (Bookname.equals(booklist.get(i).BookName)) {
flag = 0;
System.out.println(" The original title of the book is " + booklist.get(i).BookName);
System.out.println(" Please enter the revised book number 、 Title 、 author 、 Press. 、 Number of Libraries 、 pricing ");
B.setBookInfo(sc.next(), sc.next(), sc.next(), sc.next(), sc.next(), sc.nextInt(), sc.nextDouble());
System.out.println(" Modification successful ");
System.out.println("1、 Continue to modify \t2、 End modification ");
int chioce = sc.nextInt();
if (chioce == 1) {
break;
} else if (chioce == 2) {
return;
} else {
System.out.println(" Incorrect input , Continue to modify by default ");
}
}
}
if (flag == 1)
System.out.println(" There is no such book , Please re-enter ");
} else {
System.out.println(" Incorrect input , Please re-enter ");
}
}
}
Student
Create a student class
public class ReaderInfo {
public ReaderInfo(String ID, String readerName, String college, String aClass) {
this.ID = ID;
ReaderName = readerName;
College = college;
Class = aClass;
}
public void setReader(String ID, String readerName, String college, String aClass)
{
this.ID = ID;
ReaderName = readerName;
College = college;
Class = aClass;
}
public String toString() {
return " Student ID：" + ID + "\t" + " The student's name ：" + ReaderName + "\t" +
" college ：" + College + "\t" + " class ：" + Class ;
}
public String ID; // Student number
public String ReaderName; // full name
public String College; // college
public String Class; // Professional class
}
Student information adding function
Including student ID 、 full name 、 college 、 Professional classes, etc
public static void AddReader()// Student information added
{
Scanner sc = new Scanner(System.in);
while (true) {
System.out.println(" At present, there is " + readlist.size() + " A reader !");
System.out.println(" Please enter the student id number 、 full name 、 college 、 Professional class ");
ReaderInfo R = new ReaderInfo(sc.next(), sc.next(), sc.next(), sc.next());
readlist.add(R);
System.out.println(" Student information added successfully ");
System.out.println("1、 Continue to add \t2、 End adding ");
int chioce = sc.nextInt();
if (chioce == 1) {
continue;
}
if (chioce == 2) {
break;
}
}
}
Student information inquiry
By student number 、 full name 、 Professional classes, etc
public static void PrintReader()// Student information inquiry
{
Scanner sc = new Scanner(System.in);
OUT1:
while (true) {
System.out.println(" Enter the student number or name or class of the student to be queried ");
int flag = 1;
String Info = sc.next();
for (int i = 0; i < readlist.size(); i++) {
if (Info.equals(readlist.get(i).ReaderName) || Info.equals(readlist.get(i).ID) || Info.equals(readlist.get(i).Class)) {
flag = 0;
System.out.println(readlist.get(i).toString());
System.out.println("1、 Continue query " + "\t" + "2、 The end of the query ");
int choice = sc.nextInt();
if (choice == 1) {
break;
}
if (choice == 2) {
break OUT1;
}
}
}
if (flag == 1) {
System.out.println(" This person... Is not found , Please re-enter ");
}
}
}
Student information ranking
According to the student id 、 Colleges, etc. are sorted in ascending order
public static void SortStu()// Student information ranking
{
System.out.println("1、 Sort by student number " + "\t" + "2、 Sort by College ");
Scanner sc = new Scanner(System.in);
int choice = sc.nextInt();
if (choice == 1) {
Collections.sort(readlist, (o1, o2) -> o1.ID.compareTo(o2.ID));
System.out.println(" Sort success ");
System.out.println(" Student list :");
for (int i = 0; i < readlist.size(); i++) {
System.out.println(readlist.get(i).toString());
}
System.out.println(" Please enter 0 Exit sort ");
if (sc.nextInt() == 0) {
return;
}
}
if (choice == 2) {
Collections.sort(readlist, (o1, o2) -> o1.College.compareTo(o2.College));
System.out.println(" Sort success ");
System.out.println(" Student list :");
for (int i = 0; i < readlist.size(); i++) {
System.out.println(readlist.get(i).toString());
}
System.out.println(" Please enter 0 Exit sort ");
if (sc.nextInt() == 0) {
return;
}
}
}
Modification of student information 、 Delete
According to the student id + Name to modify and delete reader information
public static void ChaReStu()// Modification of student information 、 Delete
{
Scanner sc = new Scanner(System.in);
while (true) {
int flag = 1;// Mark
System.out.println(" According to the student id + Name to modify and delete student information ");
System.out.println(" Please enter student number and student name ");
String Id = sc.next();
String StuName = sc.next();
for (int i = 0; i < readlist.size(); i++) {
if (readlist.get(i).ID.equals(Id) && readlist.get(i).ReaderName.equals(StuName)) {
flag = 0;
System.out.println("1、 Make changes " + "\t" + "2、 To delete ");
int chioce = sc.nextInt();
if (chioce == 1) {
ReaderInfo R1 = readlist.get(i);
System.out.println(" Please enter new student information （ Student ID、 full name 、 college 、 class ）");
R1.setReader(sc.next(), sc.next(), sc.next(), sc.next());
System.out.println(" Modification successful ");
System.out.println("1、 Continue to operate the student information " + "\t" + "2、 End operation ");
int Op = sc.nextInt();
if (Op == 1) {
break;
}
if (Op == 2) {
return;
}
}
if (chioce == 2) {
readlist.remove(i);
System.out.println(" Delete successful ");
System.out.println("1、 Continue to operate the student information " + "\t" + "2、 End operation ");
int Op = sc.nextInt();
if (Op == 1) {
break;
}
if (Op == 2) {
return;
}
}
}
}
if (flag == 1) {
System.out.println(" The student information is wrong , Please re-enter ");
}
}
}
Book borrowing
Create information classes for book borrowers
public class BookBorrow {
public BookBorrow(String ID, String name, String College, String bookNum, String bookName, String lendTime, String legalTime) {
this.ID = ID;
Name = name;
this.College = College;
BookNum = bookNum;
BookName = bookName;
LendTime = lendTime;
LegalTime = legalTime;
}
@Override
public String toString() {
return "ID:" + ID + "\t" + " The student's name :" + Name + "\t" +
" Book number :" + BookNum + "\t" + " Title :" + BookName +
"\n" + " Due time :" + LegalTime + '\n' +
" Return time : " + BorrowTime;
}
String ID; // Student number
String Name;// full name
String College;
String BookNum; // Book number
String BookName; // Title
String LendTime;// Borrowing time
String LegalTime;// Due time
String BorrowTime = " Borrowing "; // Return time
public void setBookReader(String ID, String name)/* Register student information */ {
this.ID = ID;
Name = name;
}
// The rest can be constructed directly through the editor （ I won't repeat ）
}
With Student number + Book number To borrow
public static void BorrowBook() // Book borrowing
{
Scanner sc = new Scanner(System.in);
int flag = 0;/* Mark */
int Br = 0;// Number of book borrowers
while (true) {
System.out.println(" Please enter the book number and personal student number of the book you want to borrow to log in ：");
String BookNum = sc.next();
String Id = sc.next();
OUT:
for (int i = 0; i < booklist.size(); i++) {
for (int i1 = 0; i1 < readlist.size(); i1++) {
if (BookNum.equals(booklist.get(i1).BookNum) && Id.equals(readlist.get(i1).ID)) {
flag = 1;// The tag finds the corresponding student information and book information
if (booklist.get(i).BookCount >= 1) {
booklist.get(i).BookCount -= 1;
System.out.println(" Please enter your student number 、 full name 、 College and book number of books borrowed 、 Title :");
String Id1 = sc.next();
String StuName = sc.next();
String College = sc.next();
String BookId = sc.next();
String BookName = sc.next();
String LendT = LendTime();
String LegT = LealTime();
BookBorrow B = new BookBorrow(Id1, StuName, College, BookId, BookName, LendT, LegT);
borrowlist.add(B);
System.out.println(" Student student id ：" + borrowlist.get(Br).ID + "\t" + " full name " + borrowlist.get(Br).Name +
"\t" + " Book number :" + borrowlist.get(Br).BookNum + "\t" + " Title ：" + borrowlist.get(Br).BookName);
System.out.println(" Borrowing time :" + borrowlist.get(Br).LendTime);
System.out.println(" Due time :" + borrowlist.get(Br).LegalTime);
System.out.println(" Borrowing succeeded ");
System.out.println("1、 Continue to borrow " + "\t" + "2、 Exit the system ");
int chioce = sc.nextInt();
if (chioce == 1) {
break OUT;
}
if (chioce == 2) {
return;
}
} else if (booklist.get(i).BookCount < 1) {
System.out.println(" This book has been completely borrowed , Please reselect ");
System.out.println("1、 Continue to borrow " + "\t" + "2、 Exit the system ");
int chioce = sc.nextInt();
if (chioce == 1) {
break OUT;
}
if (chioce == 2) {
return;
}
}
}
}
}
if (flag == 0) {
System.out.println(" Incorrect input , Please re-enter ");
}
}
}
Book return
With Student number + Book number The way to return books
public static void BackBook()// Book return
{
Scanner sc = new Scanner(System.in);
int flag = 1;// Mark whether the correct information is found
OUT:
while (true) {
System.out.println(" Please enter the student number and book number :");
String StuId = sc.next();
String BookId = sc.next();
for (int i = 0; i < borrowlist.size(); i++) {
if (StuId.equals(borrowlist.get(i).ID) && BookId.equals(borrowlist.get(i).BookNum)) {
flag = 0;// Mark to find the correct information
System.out.println(borrowlist.get(i).toString());
System.out.println("1、 The return 2、 return ");
int choice = sc.nextInt();
if (choice == 1) {
booklist.get(i).BookCount++;
String CurrentTime = LendTime();
borrowlist.get(i).setBorrowTime(CurrentTime);
System.out.println(" Successful return ");
System.out.println(borrowlist.get(i).toString());
System.out.println("1、 Continue to return 2、 sign out ");
int choice1 = sc.nextInt();
if (choice1 == 1) {
break OUT;
}
if (choice1 == 2) {
return;
}
}
if (choice == 2) {
System.out.println("1、 Continue to return 2、 sign out ");
int choice1 = sc.nextInt();
if (choice1 == 1) {
break OUT;
}
if (choice1 == 2) {
return;
}
}
}
}
if (flag == 1) {
System.out.println(" Please enter the correct information ");
}
}
}
Book borrowing inquiry
public static void PriBookReader() // Book borrowing inquiry
{
Scanner sc = new Scanner(System.in);
while (true) {
int flag = 0;
System.out.println("1、 By student number 2、 Search by title 3、 Query by College ");
int chioce = sc.nextInt();
switch (chioce) {
case 1:
System.out.println(" Please enter the student number to inquire ");
String Id = sc.next();
for (int i = 0; i < borrowlist.size(); i++) {
if (Id.equals(borrowlist.get(i).ID)) {
flag = 1;
System.out.println(borrowlist.get(i).toString());
}
}
if (flag == 1) {
System.out.println("1、 Continue query 2、 sign out ");
int chioce1 = sc.nextInt();
if (chioce1 == 1) {
break;
}
if (chioce1 == 2) {
return;
}
}
if (flag == 0) {
System.out.println(" The information is wrong , Please re-enter ");
}
break;
case 2:
System.out.println(" Please enter the title of the book to be queried :");
String BN = sc.next();
for (int i = 0; i < borrowlist.size(); i++) {
if (BN.equals(borrowlist.get(i).BookName)) {
flag = 1;
System.out.println(borrowlist.get(i).toString());
}
}
if (flag == 1) {
System.out.println("1、 Continue query 2、 sign out ");
int chioce1 = sc.nextInt();
if (chioce1 == 1) {
break;
}
if (chioce1 == 2) {
return;
}
}
if (flag == 0) {
System.out.println(" The information is wrong , Please re-enter ");
}
break;
case 3:
System.out.println(" Please enter the college to be queried ");
String College = sc.next();
for (int i = 0; i < borrowlist.size(); i++) {
if (College.equals(borrowlist.get(i).College)) {
flag = 1;
System.out.println(borrowlist.get(i).toString());
}
}
if (flag == 1) {
System.out.println("1、 Continue query 2、 sign out ");
int chioce1 = sc.nextInt();
if (chioce1 == 1) {
break;
}
if (chioce1 == 2) {
return;
}
}
if (flag == 0) {
System.out.println(" The information is wrong , Please re-enter ");
}
break;
default:
System.out.println(" Incorrect input , Please reselect ");
break;
}
}
}
IO flow
Take the storage and reading of book information as an example （ Using character stream ）
Deposit in ：
public static void OutBookInformation() throws Exception{
Writer file=null;
try {
file=new FileWriter("D:\\BookInfo.txt",false);
for (int i = 0; i < booklist.size(); i++) {
BookInfo c=booklist.get(i);
file.write(String.valueOf(c));
}
} catch (Exception e) {
e.printStackTrace();
}finally {
file.close();
}
}
Read ：
public static void Print() throws Exception{
Reader re=new FileReader("D:\\BookInfo.txt");
char[] buff=new char[100];
int len;
while ((len=re.read(buff))!=-1)
{
String rs=new String(buff,0,len);
System.out.print(rs);
}
}
Add （ About the acquisition of time ）
public static String LendTime()// Get the current time
{
Calendar rightnow = Calendar.getInstance();
int year = rightnow.get(Calendar.YEAR);
int month = rightnow.get(Calendar.MONTH) + 1;
int day = rightnow.get(rightnow.DAY_OF_MONTH);
int hour = rightnow.get(rightnow.HOUR_OF_DAY);//24 hourly
int minute = rightnow.get(rightnow.MINUTE);
int second = rightnow.get(rightnow.SECOND);
int millisecond = rightnow.get(rightnow.MILLISECOND);
String TIME = year + "-" + month + "-" + day + "\t" + hour + ":" + minute+":"+second;
return TIME;
}
Other time settings reference current time The modification method of the acquisition of can be modified
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