Java 扫描仪与用户输入不一致

我正在开发一个具有EditBook方法的库应用程序，但目前我在让它做我想做的事情方面遇到了问题。这是我到目前为止所拥有的

editBook（）方法

下面是switch语句中的代码

case 2: //Edit a Book

            System.out.println("You have chosen to edit a book.");
            System.out.println("Enter the ID of the book you would like to edit: ");
            int ID = sc.nextInt();
            int i = ID;

            System.out.println("You are about to edit: " + mcClay.getBooks().get(i).getTitle() + " by " + 
                    mcClay.getBooks().get(i).getAuthor() );

            System.out.println("Please enter the book's new title: ");
            title = sc.nextLine();
            sc.next();

            System.out.println("Please enter the book's new author: ");
            author = sc.nextLine();
            sc.next();

            System.out.println("How many books do you have?: ");
            while (!sc.hasNextInt()) {
                System.out.println("Enter an integer!");
                sc.nextLine();
                }
            quantity = sc.nextInt();

            System.out.println("How many books currently on loan? (Enter 0 if none): ");
            while (!sc.hasNextInt()) {
                System.out.println("Enter an integer!");
                sc.nextLine();
                }
            numOnLoan = sc.nextInt();

            System.out.println("How many times has this book been loaned out? (Enter 0 if never): ");
            while (!sc.hasNextInt()) {
                System.out.println("Enter an integer!");
                sc.nextLine();
            }
            numTimesLoaned = sc.nextInt();

我用以下输入测试了它，这就是我得到的

You have chosen to edit a book.
Enter the ID of the book you would like to edit: 
1
You are about to edit: Harry Potter and the Chamber of Secrets by J.K.     Rowling
Please enter the book's new title: 
Harry Potter
Please enter the book's new author: 
J.K Rowling
How many books do you have?: 
Enter an integer!
1
How many books currently on loan? (Enter 0 if none): 
0
How many times has this book been loaned out? (Enter 0 if never): 
0
The new details of this book are: ID: 0Title:  Author:  Potter  Quantity: 1 No. on Loan: 0 No. of times loaned: 0    

这显然是错误的，因为没有存储正确的ID、标题或作者，即使我没有输入任何内容，“数量”的输入也会抛出错误

---

我还是编程新手，这让我很困惑。

尝试为

字符串和
int
s创建单独的
Scanner
s。Java
扫描器在使用它进行多种类型的读取时，往往会表现出奇怪的行为。
请记住，如果通过
nextLine（）进行读取，则不需要使用剩余的换行符
-换行符是此实例中的分隔符，它是consumedUse
next
而不是
nextLine
来使用无效令牌
nextLine
尝试读取数据，直到下一行分隔符或流结束，但
nextLine
不使用行分隔符。
You have chosen to edit a book.
Enter the ID of the book you would like to edit: 
1
You are about to edit: Harry Potter and the Chamber of Secrets by J.K.     Rowling
Please enter the book's new title: 
Harry Potter
Please enter the book's new author: 
J.K Rowling
How many books do you have?: 
Enter an integer!
1
How many books currently on loan? (Enter 0 if none): 
0
How many times has this book been loaned out? (Enter 0 if never): 
0
The new details of this book are: ID: 0Title:  Author:  Potter  Quantity: 1 No. on Loan: 0 No. of times loaned: 0