How to pass an argument into a non-static method?

Question

so I want to call this method from another class which is a non-static method that requires an argument of a string. However when I try to enter an argument into the parameter for the book.borrow method it says that I "cannot make a static reference to a non-static method". What am I doing wrong here?

import java.util.Scanner;

public class LibrarySystem{
    public static void main(String[]args){
        book book1 = new book("Divergent", "Veronica Roth", "B001", null);
        book book2 = new book("Green Eggs and Ham", "Dr Seuss", "B002", null);
        System.out.printf("%s\n", book1.title.toString()+ " " + (book1.bookID.toString()));
        System.out.printf("%s\n", book2.title.toString()+ " "  + (book2.bookID.toString()));

        Scanner students = new Scanner(System.in);
        String student  = String.valueOf(students);
        book.borrow(student);
    }
}

Underneath has the method that I want to call

public boolean borrow(String borrowerID) {
    if (bookID != null) {
        this.borrowerID = borrowerID;
        return true;
    } else {
        return false;
    }
}

call the method on a instance of book, so instead of `book.borrow(student)` use `book1.borrow(student)` — SteelToe, Mar 26 '18 at 13:45
Oh my lord. Thank you so much, I actually had no idea, I thought I had to call the method from the book class so I put book instead.... — Steven Jeffs, Mar 26 '18 at 13:49

score 0 · Accepted Answer · answered Mar 26 '18 at 13:48

0

book.borrow(student);

above code snippet would have been valid if borrow method was a static method.

Since its not-static, you can only call it on an instance of book class.

book1.borrow(student);

answered Mar 26 '18 at 13:48

Yousaf

27,861
6
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score 0 · Answer 2 · answered Mar 26 '18 at 13:49

0

If a method is not declared static, the method must be called on an instance of the object, not a static reference. You must initialize the class containing the method, then run borrow().

answered Mar 26 '18 at 13:49

Bradley H

339
1
7

How to pass an argument into a non-static method?

2 Answers2