Project 2230026050.zip

import java.util.InputMismatchException; import java.util.Scanner; public class CIL{ private static Scanner input = new Scanner(System.in); private static String readLine(String msg) { System.out.print(msg); return input.nextLine(); } private static int readPosInt(String msg) { while (true) { System.out.print(msg); try { int num = input.nextInt(); input.nextLine(); // consume newline character if (num < 0) { System.out.println("Positive integers only!"); continue; } return num; } catch (InputMismatchException e) { System.out.println("You must type an integer!"); input.nextLine(); // consume wrong input } } } public static void main(String[] args) throws Exception { Library library=new Library("UIC Library"); while(true){ int action=readPosInt(msg); switch(action){//Show all the actions case 1: System.out.println("Total number of borrowed books: " + library.totalBorrowedBooks()); break; case 2: int qst1=0; qst1=readPosInt("Type the user role (lender:1 borrower:2): "); String name; int num; if(qst1==1) { System.out.print("Enter the name of the user: "); name=input.nextLine(); System.out.print("Enter the initial number of borrowed books: "); num=input.nextInt(); Lender ler=new Lender(name, num); l.addUser(ler); System.out.println("Lender " + "\"" + name + "\"" + "lending " + num + "book(s) has been added."); }else if(qst1==2){ System.out.print("Enter the name of the user: "); name = input.nextLine(); System.out.print("Enter the initial number of borrowed books: "); num = input.nextInt(); try { Borrower ber=new Borrower(name, num); l.addUser(ber); } catch(NotALenderException e) { System.out.println("BUG! This must never happen!"); System.exit(1); } System.out.println("Borrower \"" + name + "\" borrowing " + num + "book(s) has been added."); } else { System.out.println("Unknown user role!"); } break; //Show the borrowed books case 3: String name3; System.out.print("Enter the name of the user: "); name3 = input.nextLine(); int num3; try { num3 = l.getBook(name3); System.out.println(name3 + " borrows " + num3 + " book(s)."); } catch (UnknownUserException e){ System.out.println("User " + name3 + " unknown."); } //Lend or borrow more books. case 4: String name4; int num4 = 0; System.out.print("Enter the name of the user: "); name4=input.nextLine(); num4=readPosInt("Enter the number of books: "); try{ l.moreBook(name4, num4); int num4_1 = l.getBook(name4); System.out.println(name4 + " borrows " + num4_1 + " book(s)."); }catch(NotALenderException e) { System.out.println("BUG! This must never happen!"); System.exit(1); }catch(UnknownUserException e){ System.out.println("User " + name4 + " unknown."); } break; //Lend or borrow more books. case 5: String name5; int num5=0; System.out.print("Enter the name of the user: "); name5=input.nextLine(); num5=readPosInt("Enter the number of books: "); try { l.moreBook(name5, -num5); int num5_1=l.getBook(name5); System.out.println(name5 + " borrows " + num5_1 + " book(s)."); }catch(NotALenderException e) { System.out.println(e.getMessage()); }catch(UnknownUserException e){ System.out.println("User " + name5 + " unknown."); } break; //Quiz the menu. case 6: System.out.println("Goodbye!"); System.exit(1); default: System.out.println("Unknown action!"); break; } } } }