我一直在尝试将我的方法更改为无效。但是每当我更改它时,它总是会打印出书名和错误消息。如何将我的方法更改为无效?
public int displayBookDetails(String bookName) {
for (int i = 0; i < classrooms.size(); i++) {
Library library = librarys.get(i);
if (library.returnBookName().equals(bookName)) {
System.out.println("Index: " + i);
System.out.println(library.returnBookName());
System.out.println(library.authorName());
return i;
}
}
return -1;
System.out.println ("Book name is not valid");
}