把 Type an action (total:1 add:2 get:3 more:4 less:5 quit:6)转换为java代码

时间: 2024-01-07 09:02:51 浏览: 98
以下是将 "Type an action (total:1 add:2 get:3 more:4 less:5 quit:6)" 转换为 Java 代码的示例: ``` Scanner scanner = new Scanner(System.in); System.out.println("Type an action (total:1 add:2 get:3 more:4 less:5 quit:6)"); int action = scanner.nextInt(); switch (action) { case 1: // do something for "total" break; case 2: // do something for "add" break; case 3: // do something for "get" break; case 4: // do something for "more" break; case 5: // do something for "less" break; case 6: // do something for "quit" break; default: System.out.println("Invalid action, please try again."); } ```
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Action 4: increasing the number of books of a given user. When the user of the software specifies action 4, your program must ask the user to type the name of a user, and a number of books, and the program then uses that number to increase the number of books lent or borrowed by the user. Then the program goes back to the main menu. For example: Type an action (total:1 add:2 get:3 more:4 less:5 quit:6): 3 Enter the name of the user: Anna Anna borrows -5 book(s). Type an action (total:1 add:2 get:3 more:4 less:5 quit:6): 4 Enter the name of the user: Anna Enter the number of books: 2 Type an action (total:1 add:2 get:3 more:4 less:5 quit:6): 3 Enter the name of the user: Anna Anna borrows -7 book(s). Type an action (total:1 add:2 get:3 more:4 less:5 quit:6): 3 Enter the name of the user: Bob Bob borrows 10 book(s). Type an action (total:1 add:2 get:3 more:4 less:5 quit:6): 4 Enter the name of the user: Bob Enter the number of books: 2 Type an action (total:1 add:2 get:3 more:4 less:5 quit:6): 3 Enter the name of the user: Bob Bob borrows 12 book(s). Type an action (total:1 add:2 get:3 more:4 less:5 quit:6): If the name of the user is wrong, then an UnknownUserException exception will be thrown by the Library object. The code of the main method of your CLI class must catch this exception, print the error message from the exception object, and then it just goes back to printing the menu of actions (by just going back to the beginning of the while loop). For example (where 4, aaaa, and 2 are inputs from the user): Type an action (total:1 add:2 get:3 more:4 less:5 quit:6): 4 Enter the name of the user: aaaa Enter the number of books: 2 User aaaa unknown. Type an action (total:1 add:2 get:3 more:4 less:5 quit:6): Note that, even if a consumer is a borrower, the readPosInt method prevents the typed number of books from being negative. This means a borrower will never throw a NotALenderException. Nevertheless the code of the main method of your CLI class must handle this exception by printing the error message "BUG! This must never happen!" and immediately terminating the program using System.exit(1). For example (where 3, Bob, 4, Bob, and -15 are inputs from the user): Type an action (total:1 add:2 get:3 more:4 less:5 quit:6): 3 Enter the name of the user: Bob Bob borrows 12 book(s). Type an action (total:1 add:2 get:3 more:4 less:5 quit:6): 4 Enter the name of the user: Bob Enter the number of books: -15 Positive integers only! Enter the number of books:

Action 2: adding a new user to the library. When the user of the software specifies action 2, your program must add a new user to the library. To add a new user, your program needs to ask the user three things: the role of user (an integer read using readPosInt: the integer 1 represents lender, the integer 2 represents borrower, any other integer must result in an error message "Unknown user role!" being printed and the software going immediately back to the main menu), the name of the user (a string read using readLine), and the initial number of books that the user lends (for a lender) or borrows (for a borrower). You program must then create the correct user, add it to the library, and print an information message. The program then goes back to the menu. For example (where 2, 3, 2, 1, Anna, 5, 2, 2, Bob, and 10 are inputs from the user): Type an action (total:1 add:2 get:3 more:4 less:5 quit:6): 2 Type the user role (lender:1 borrower:2): 3 Unknown user role! Type an action (total:1 add:2 get:3 more:4 less:5 quit:6): 2 Type the user role (lender:1 borrower:2): 1 Enter the name of the user: Anna Enter the initial number of borrowed books: 5 Lender "Anna" lending 5 book(s) has been added. Type an action (total:1 add:2 get:3 more:4 less:5 quit:6): 2 Type the user role (lender:1 borrower:2): 2 Enter the name of the user: Bob Enter the initial number of borrowed books: 10 Borrower "Bob" borrowing 10 book(s) has been added. Type an action (total:1 add:2 get:3 more:4 less:5 quit:6): Note that the readPosInt method prevents the initial number of books from being negative, so the constructor for the Borrower class will never throw a NotALenderException when you create a borrower object. Nevertheless the code of the main method of your CLI class must handle this exception by printing the error message "BUG! This must never happen!" and immediately terminating the program using System.exit(1);

修改代码public class CLI { private static Scanner input = new Scanner(System.in); public static void main(String[] args){ Library library = new Library("UIC Library"); String names; int number ; int borrow; int totalBorrowedBooks = 50; // initial value int action = 0; Scanner scanner = new Scanner(System.in); while (action != 6) { System.out.print("Type an action (total:1 add:2 get:3 more:4 less:5 quit:6): "); String input = scanner.nextLine(); try { action = Integer.parseInt(input); } catch (NumberFormatException e) { System.out.println("You must type an integer!"); continue; } Object bookCounts; switch (action) { case 4: System.out.println("Enter the name of the user: "); names = scanner.next(); System.out.println("Enter the number of books: "); number = scanner.nextInt(); if(!names.equals("Anna") && !names.equals("Bob")) { System.out.println("User "+ names +" unknown."); break;//add break to end this operation. } System.out.println("Type an action (total:1 add:2 get:3 more:4 less:5 quit:6):"); borrow = scanner.nextInt(); System.out.print("Enter the name of the user:"); names = scanner.next(); if (names.equals("Anna")) { number -= borrow; if (number < -5) { System.out.println("You can't borrow more books. Return some books first."); } else { System.out.println(names+" borrows " + (-5 + number -1) + "book(s)."); } }else if(names.equals("Bob")) { number -= borrow; if (number > 10) { System.out.println("You can't borrow more books. You have reached the maximum limit."); } else if(number>0||number<10){ System.out.println(names+" borrows " + (10 - number +1) + " book(s)."); } else if(number<0){ System.out.println("Positive integers only!"); System.out.println("Enter the number of books:"); number = scanner.nextInt(); System.out.println(names+" borrows " + (10 - number +1) + " book(s)."); // Directly output the result after modification. } }else { System.out.println("User "+ names +" unknown."); } break;

帮我修改一下我的代码错误:帮我看看我这段代码有什么错误:int choice = readPosInt("Type an action (total:1 add:2 get:3 more:4 less:5 quit:6): "); // Perform the selected action while (choice != 6) { switch (choice) { case 1: System.out.println("Total number of borrowed books: " + Library.totalBorrowedBooks(null)); break; case 2: System.out.print("Type the user role (lender:1 borrower:2): "); int role = readPosInt(null); if (role == 1) { System.out.print("Enter the name of the user: "); String name = readLine(name); System.out.print("Enter the initial number of lent books: "); int numBooks = readPosInt(null); Lender lender = new Lender(name, numBooks); Library.addUser(lender); System.out.println("Lender "" + name + "" lending " + numBooks + " book(s) has been added."); } else if (role == 2) { System.out.print("Enter the name of the user: "); String name = readLine(name); System.out.print("Enter the initial number of borrowed books: "); int numBooks = readPosInt(null); Borrower borrower = new Borrower(name, numBooks); Library.addUser(borrower); System.out.println("Borrower "" + name + "" borrowing " + numBooks + " book(s) has been added."); } else { System.out.println("Unknown user role!"); } break; case 3: System.out.print("Enter the name of the user: "); String username = input.nextLine(); try { int numBorrowed = Library.totalBorrowedBooks(username); System.out.println(username + " borrows " + numBorrowed + " book(s)."); } catch (UnknownUserException e) { System.out.println("User " + username + " unknown."); } break; case 4: try { System.out.print("Enter the name of the user: "); String name = input.nextLine(); System.out.print("Enter the number of books: "); int num = input.nextInt(); input.nextLine(); library.moreBook(username, role); } catch (UnknownUserException e) { System.out.println("User " + username + " unknown."); } break; case 5: System.out.print("Enter the name of the user: "); username = input.next(); System.out.print("Enter the number of books: "); int numBooks = input.nextInt(); library.moreBook(username, -numBooks); // simulate decreasing books break; case 6: System.out.println("Goodbye!"); System.exit(0); break; }

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