Why one list give me a value while another don't?

[RozenKristal]

import java.util.*;

public class List
{
    public static INode head;
    public List()
    {
        head = new INode(8);

    }
    public static void main (String[] args)
    {
        INode a = new INode(8);
        int data = a.getValue();
        System.out.println(data);
        System.out.println(head.getValue());
    }


}

And my Node class:

public class INode
    {
        private int value;
        private INode right, down;
        private int row, col;

        public INode(int value)
        {
            this.value = value;
        }

        public int getValue() 
        {
            return value;
        }

        public void setValue(int value) 
        {
            this.value = value;
        }

        public INode getRight() 
        {
            return right;
        }

        public void setRight(INode right) 
        {
            this.right = right;
        }

        public INode getDown() 
        {
            return down;
        }

        public void setDown(INode down)
        {
            this.down = down;
        }

        public int getRow() 
        {
            return row;
        }

        public void setRow(int row) 
        {
            this.row = row;
        }

        public int getCol() 
        {
            return col;
        }

        public void setCol(int col) 
        {
            this.col = col;
        }


    }

Yea, head give me null, while a give me 8... can someone explains it to me?

[stultuske]

because you haven't called the constructor of your class, which means that your head list never gets instantiated either.

[jalpesh_007]

you haven't make object(instantiated) your class List, so your head variable is not initialized.

make object of that class with constructor.