import java.util.Scanner;
public class CLI {
public static void main(String[] args) {
Library l = new Library("UIC Library");
int i = 0;
while (i != 6) {
i = readPosInt("Type an action (total:1 add:2 get:3 more:4 less:5 quit:6):");
switch (i) {
case 1:
System.out.println("Total number of borrowed books:" +l.totalBorrowedBooks());
break;
case 2:
int j = readPosInt("Type the user role (lender:1 borrower:2):");
switch (j) {
case 1:
String str1 = readLine("Enter the name of the user:");
int k = readPosInt("Enter the initial number of borrowed books:");
System.out.println("Lender " + str1 +" lending "+ k + " book(s) has been added.");
Lender ll=new Lender(str1,k);
l.addUser(ll);
break;
case 2:
String str2 = readLine("Enter the name of the user:");
int p = readPosInt("Enter the initial number of borrowed books:");
System.out.println("Borrower " + str2 +" borrowing "+ p + " book(s) has been added.");
/*这里要怎么实现？？？？
Borrower bb = new Borrower(str2,p);
l.addUser(bb);
try {
Borrower b=new Borrower(str2,-1);
} catch (NotALenderException e) {
System.out.println("BUG!This must never happen!");
System.exit(1);
}
l.addUser(bb);*/
break;
default:
System.out.println("Unknown action!");
break;
}
break;
case 3:
System.out.println(3);
break;
case 4:
System.out.println(4);
break;
case 5:
System.out.println(5);
break;
case 6:
System.out.println("Goodbye!");
System.exit(0);
break;
default:
System.out.println("Unknown action!");
break;
}
}
}
public static String readLine(String str) {
System.out.print(str);
Scanner scanner = new Scanner(System.in);
return scanner.nextLine();
}
public static int readPosInt(String str) {
while (true) {
try {
System.out.print(str);
Scanner scanner = new Scanner(System.in);
int i = scanner.nextInt();
if (i < 0) {
System.out.println("Positive integers only!");
continue;
}
return i;
} catch (Exception e) {
System.out.println("You must type an integer!");
}
}
}
}
public class Borrower extends User {
public Borrower(String name, int book) throws NotALenderException {
super(name, book);
if (this.getBook() <= 0) {
throw new NotALenderException("A new borrower cannot lend books.");
} else {
super.setBook(super.getBook());
}
}
@Override
public void moreBook(int number) throws NotALenderException {
if (getBook() >= 0) {
super.setBook(super.getBook() + number);
} else {
throw new NotALenderException("A new borrower cannot lend" + (-(getBook() + number)) + "book(s).");
}
}
}
