CODEWITHSUNDEEP
java
Miles Roberts
Miles Roberts

Reputation: 405

How to reference non-static variable name from static context?

I am trying to write a code that lets the user enter a team name. Here is my code:

public class Team {
    public String name;

    public static void main(String[] args) {
        System.out.println("Enter name team");
        Scanner tn = new Scanner(System.in);
        name = tn.nextLine();     
    }
}

I understand that "non-static variable name cannot be referenced from a static context". I know that if I take the "static" away from the main then it will work, but:

a) How can I reference it without taking the "static" out?

b) Is there a way to get the users input and assign it straight to the variable "name" i.e. without the: 

Scanner tn = new Scanner(System.in);
name = tn.nextLine();

Basic questions I know, but I am still a beginner! Many thanks, Miles

Upvotes: 3

Views: 9562

Answers (5)

Marcin Szymczak
Marcin Szymczak

Reputation: 11433

Static methods/variables are bound to class. They have no access to non-static variables ( they have no idea on which instance of class they should call the method). You have to create object, and then call the non-static method.

Upvotes: 0

Ruchira Gayan Ranaweera
Ruchira Gayan Ranaweera

Reputation: 35557

You can use reflection as follows to access that non static field.

    System.out.println("Enter name team");
    Scanner tn = new Scanner(System.in);
    Team team=new Team();
    Field field=Team.class.getField("name");
    field.set(team,tn.next());
    System.out.println((String) field.get(team));

Live demo for reflection.

Or you can try as follows.

   Team team = new Team();
   team.name = tn.nextLine();

Live demo

Upvotes: 2

AbhinavRanjan
AbhinavRanjan

Reputation: 1646

Create a Team object if you want.

Team team = new Team();
team.name = tn.nextLine();

Upvotes: 0

Juned Ahsan
Juned Ahsan

Reputation: 68715

static methods do not allow to use the non-static variables directly because non-static/instance variables are initialized in memory on object creation. Hence you need to create an object of the the class and then use the variable. Do something like this:

Team teamObj = new Team();
//now access name variable using teabObj instance
teamObj.name = tn.nextLine();

Upvotes: 4

Arnaud
Arnaud

Reputation: 7439

name is a team name. So you need to instantiate a new Team object and set its name :

public static void main(String[] args) {
    System.out.println("Enter name team");
    Scanner tn = new Scanner(System.in);
    Team team = new Team();
    team.name = tn.nextLine();     
}

Upvotes: 4

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