CODEWITHSUNDEEP
javaclassmethods
Dozar
Dozar

Reputation: 71

Difficulty running method from different Class

I am making a simple program that sets the title and name of an object: book1. Eventually, the goal is to have several books under the Patron class that will use the Book class to assign values. However, I am running into difficulty simply getting the Patron class to acknowledge the Book class methods.

Basic Tester/Main method:

import java.util.Scanner;

public class ProjectFiveSix {

    public static void main(String[] args) {


        String title = "Bob";
        String name = "Hugo";       // name of patron (class assigning book)
        String author = "Rodrigo";

    Patron patronOne = new Patron();
    patronOne.setName(name);

Patron Class :

public class Patron {

    private String name;
    private Book book1;
    private Book book2;
    private Book book3;

    public Patron(){
        name = "";
        book1 = null;
        book2 = null;
        book3 = null;
    }
    public String setName(String name){
        return name;
    }
    public String borrowBook(String book1, String titleFinal, String authorFinal, String title, String author){
        if (book1 == null){
            book1.setTitle(titleFinal);    //**
            book1.setAuthor(authorFinal);  //***
    }
}
}

Book Class: 

public class Book {

    private String titleFinal;
    private String authorFinal;

    public Book(){
        titleFinal = "";
        authorFinal = "";
    }

    public String setTitle(String title){
        titleFinal = title;
        return titleFinal;
    }
    public String setAuthor(String author){
        authorFinal = author;
        return authorFinal;
    }

}

Here I am getting "Cannot find Symbol" on both lines book1.settitle and book1.setauthor. The book has been instantiated and I cannot figure out the problem.

Thanks in advance!

Upvotes: 0

Views: 93

Answers (1)

rgettman
rgettman

Reputation: 178363

You declared your parameter book1 (a String) as the same name as your instance variable book1 (a Book). To reference the instance variable, either name the parameter a different variable name, or use this. to specify the instance variable:

this.book1.setTitle(titleFinal);    //**
this.book1.setAuthor(authorFinal);  //***

Either way, you'll need to create an actual Book instance, or else your instance variable book1 will remain null and you'll get a NullPointerException.

Upvotes: 1

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