如何让用户在代码中设置自己的订单号？

Question

I am a beginner programmer and I don't understand why I can not set the orderNum in my driver. I want the user to be able to set the orderNum on their own because there is no orderNum the is predisposed.

public class Cafe 
{
    private int orderNum;
    private String cafeName, cafeID;

    public Cafe()
    {
        int orderNum;
        String cafeName = null, cafeID;
    }
    public String setName(String cafeID)
    {
        if(cafeID.equals("101"))
            cafeName = "Essex Cafe";
        else if(cafeID.equals("252"))
            cafeName = "White Marsh Cafe";
        else
            cafeName = "Towson Cafe";
        return cafeName;
    }
    public String toString()
    {

        return "\t" + cafeName + "\nOrder Number = " + orderNum;
    }
}

import java.util.Scanner;
public class CafeProject 
{
    public static void main(String[] args)
    {
    Scanner scan = new Scanner(System.in);
    Cafe Emp = new Cafe();

    System.out.print("Enter Cafe Identifier:    ");
    Emp.setName(scan.next());




    System.out.print(Emp);
    }
}

Answer 1

Change your program like this you can set order no manually

import java.util.Scanner;
class Cafe
{
    private int orderNum;
    private String cafeName, cafeID;

    public Cafe()
    {        int orderNum;
        String cafeName = null, cafeID;
    }
    public String setName(String cafeID)
    {
        if(cafeID.equals("101"))
            cafeName = "Essex Cafe";
        else if(cafeID.equals("252"))
            cafeName = "White Marsh Cafe";
        else
            cafeName = "Towson Cafe";
        return cafeName;
    }
    public void setOrderNo(int orderNo){
        orderNum=orderNo;
    }
    public String toString()
    {

        return "\t" + cafeName + "\nOrder Number = " + orderNum;
    }
}

public class CafeProject
{
    public static void main(String[] args)
    {
    Scanner scan = new Scanner(System.in);
    Cafe Emp = new Cafe();

    System.out.print("Enter Cafe Identifier:    ");
    Emp.setName(scan.next());
    System.out.print("Enter Order No:    ");
    Emp.setOrderNo(scan.nextInt());



    System.out.print(Emp);
    }
}

You just need a function to set order