I changed three places for you:
In the 1.borrowBooks method, put System.out.println ("Do you want to borrow it?" ); Replace with:
System.out.println ("Do you want to borrow it? Enter 1 for loan, and enter other numbers without loan. ”);
When you enter, you must enter a number, otherwise you will report an error.
2. In the 2.borrowBooks method, set self [score] = all [9]; Changed to: self [score] = all [I];
If it is all [9], it will always be the information of the last book.
3. In the 3.have method, you want to print out all the information of the borrowed books. A lot of changes, the following note code is original.
void have(Books[] self) {
//for(int I = 0； I<2; i++) {
// self[i]。 showBookInfo()；
// }
for(int I = 0； I<3; i++) {
if(self[i]！ = empty)
Self [me]. showBookInfo()；
}
}
* * * * * * * * * * * * * * All codes have been attached: * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *.
Import java.util.scanner;
Public class test manual {
Public static void main(String[] args) {
Books all[] = new book [10];
Books self[] = new book [3];
All [0] = newbooks ("Java", 1, "12345", "Tom", 34.0f, "People's Publishing House");
All [1] = new book ("C", 2, "12346", TNN, 3 1.0f, "People's Publishing House");
All [2] = new book ("C++", 3, "12445", "MM", 35.0f, "People's Publishing House");
All [3] = new book (C #, 4, 12365, TT, 38.0f, People's Publishing House);
All [4] = New Books (J2SE, 5, 13345, TOSM, 3 1. 1f, People's Publishing House);
All [5] = new books (J2EE, 6, 18345, TTM, 32.0f, People's Publishing House);
All [6] = new book ("JSP", 7, "12335", "CC", 33.0f, "People's Publishing House");
All [7] = newbooks ("net ",8," 1234 1 ","bb ",36.0f," People's Publishing House ");
All [8] = new book ("IP", 9, "12343", "AA", 37.0f, "People's Publishing House");
All [9] = new book (TCP, 10, 22345, jj, 39.0f, People's Publishing House);
Reader r = new reader ("Xiao Ming", 10 1, "1", 3);
R.searchAllBooks (all);
R.borrowBooks (all, yourself);
R.have (self);
r.give(all，self)；
}
}
Class readers {
Scanner scan = new scanner (system. in);
String name;
int nums
String class;
Int grade;
Int score = 0;
//Books self[]= new book [3];
Readers(String n，int u，String c，int g) {
names = n；
nums = u；
class = c；
Grade = g；;
}
Void search all books (books [] all) {//Find books.
for(int I = 0； I< 10; i++)
All [me]. showBookInfo()；
//self[score]= all[0]；
}
Void give (books [] all，books [] self) {//
System.out.println ("Please enter the book number of the book you want to return");
int n = scan . nextint()；
for(int I = 0； I< 10; i++) {
if (n == all[i]。 num) {
for(int j = 0； j & lt3; j++) {
if (self[j] == all[i]) {
self[j]= null；
System.out.println ("Book returned successfully");
}
}
}
}
}
void have(Books[] self) {
//for(int I = 0； I<2; i++) {
// self[i]。 showBookInfo()；
// }
for(int I = 0； I<3; i++) {
if(self[i]！ = empty)
Self [me]. showBookInfo()；
}
}
void giveMoney() {
}
Books[] all, Books[] self) {
System.out.println ("Please enter the title you are looking for:");
string n = scan . next()；
int I；
for(I = 0； I< 10; i++) {
If (n n. equals (all[i]). Name)) {
All [me]. showBookInfo()；
Break;
}
}
//System.out.println ("Do you want to borrow it?" );
System.out.println ("Do you want to borrow it? Enter 1 for loan, and enter other numbers without loan. ”);
int j；
j = scan . nextint()；
if (j == 1) {
System.out.println ("successful loan");
//self[score]= all[9]；
self[score]= all[I]；
Score+=1;
}
If (score & lt4) {
System.out.println ("you can still borrow" +(3 points)+"Ben");
} Otherwise {
System.out.println ("Sorry, one person can only borrow three copies");
}
}
}
Classroom books {
String name;
int num
String ISBN
String writer;
Floating price;
String publisher;
Books (string n, int u, string I, string w, floating point p, string l) {
name = n；
num = u；
ISBN = I；
writer = w；
Price = p；;
publisher = l；
}
void showBookInfo() {
system . out . println(" * * * * * * * * * * * * * * * * * * * * * * *)；
system . out . println(" title:"+name)；
System.out.println ("call number:"+num);
System.out.println("ISBN number: "+ISBN);
system . out . println(" price:"+price)；
system . out . println(" publisher:"+publisher)；
system . out . println(" * * * * * * * * * * * * * * * * * * * * * * *)；
}
}
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