CODEWITHSUNDEEP
java
CodeConnoisseur
CodeConnoisseur

Reputation: 1909

Print out a method from one java class when called from a 2nd java class

I am new to JAVA and am attempting to call a method from a class that prints out a message using the same method within another class. I am very new to java and really want to learn.

What I want to do is call the getAllCustomerInfo() method from the CustomerInfo{} class which is being called from the Customer class. When I try to run the code I get the error:

Exception in thread "main" java.lang.Error: Unresolved compilation problem: Cannot make a static reference to the non-static field c

If I make c static (static Customer c = new Customer();) and try to run my code it only prints the commas out from the getAllCustomerInfo() method and not the getName(), getAddress etc information.

Any ideas? Thank you.

CLASS 1:

public class Customer {
    //Assume I have getters and setters and fields

    //Method I want to use in another class
    public String getAllCustomerInfo() {
        String message =
            getName() + "\n" +
            getAddress() + "\n" +
            getAge();

        System.out.println(message);

        return message;
    }

} //END OF CUSTOMER CLASS

CLASS2:

//Class I am trying to call method from
public class CustomerInfo {
    Customer c = new Customer();

    public static void main(String args[]) {

        //Code where I am trying to access the method from the Customer class


        while (choice.equalsIgnoreCase("y")) {

            System.out.print("Enter a customer number: ");
            int customerNumber = sc.nextInt();

            String customerInformation = sc.nextLine();

            // get the Product object
            Customer customer = CustomerDB.getCustomer(customerNumber);

            //Check if customer exits in DB
            if (customerNumber == 1) {
                // display the output
                System.out.println(c.getAllCustomerInfo());
            } else {
                System.out.println("There is no one like that in the DB.");
            }

            // see if the user wants to continue
            System.out.print("Continue? (y/n): ");
            choice = sc.nextLine();
            System.out.println();
       }
   }

}

Upvotes: 0

Views: 488

Answers (1)

Chathura Buddhika
Chathura Buddhika

Reputation: 2195

In the CustomerInfo class, c is a instance variable which will not exist without an object instance of CustomerInfo class. Since you are referring it from static context you will get such error. You have to make c variable static or move it inside the main method. 

public class CustomerInfo{
   static Customer c = new Customer();
   public static void main(String args[]) {
      // your implementation
   }
}

OR

public class CustomerInfo{
   public static void main(String args[]) {
      Customer c = new Customer();
      // your implementation
   }
}

Upvotes: 1

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