java - Carry over variable value to new method -

i'm new java , can't seem method working without having reset variable value of 'null' or new object. need have user input carry on next method.

public static void additem () {     scanner console = new scanner(system.in);      string desc, id, str="";     double price = 0, setupprice = 0, unitcost = 0, inventorycost = 0;     int stock = 0, demand = 0;     product product  = new product();       system.out.print("please enter product description between 3 10 characters...: ");     desc = console.next();     desc = desc.tolowercase();     product.setname(desc);       /*if (desc.length < 3 || desc.length > 10)     {         system.out.print("this input incorrect, please try again.");     }*/     system.out.print("please enter price in $ : ");     price = console.nextdouble();     system.out.print("please enter set price. $ : ");     setupprice = console.nextdouble();     system.out.print("please enter unit- cost. $ : ");     unitcost = console.nextdouble();     system.out.print("please enter inventory cost. $ : ");     inventorycost = console.nextdouble();     system.out.print("please enter amount in stock : ");     stock = console.nextint();     system.out.print("please enter demand of product : ");     demand = console.nextint();       // need code here repeat fuction again if y pressed.     // if n pressed need return inventory management interface.  }  public static void proddata () {     product product = new product();      system.out.println("the information product : ");     system.out.println("product description : "+product.getname()); } 

declare product var global , access follows

    public static  product product;   public static void additem () {     product  = new product();     scanner console = new scanner(system.in);      string desc, id, str="";     double price = 0, setupprice = 0, unitcost = 0, inventorycost = 0;     int stock = 0, demand = 0;      system.out.print("please enter product description between 3 10 characters...: ");     desc = console.next();     desc = desc.tolowercase();     product.setname(desc);       /*if (desc.length < 3 || desc.length > 10)     {         system.out.print("this input incorrect, please try again.");     }*/     system.out.print("please enter price in $ : ");     price = console.nextdouble();     system.out.print("please enter set price. $ : ");     setupprice = console.nextdouble();     system.out.print("please enter unit- cost. $ : ");     unitcost = console.nextdouble();     system.out.print("please enter inventory cost. $ : ");     inventorycost = console.nextdouble();     system.out.print("please enter amount in stock : ");     stock = console.nextint();     system.out.print("please enter demand of product : ");     demand = console.nextint();      // need code here repeat fuction again if y pressed.     // if n pressed need return inventory management interface.  }  public static void proddata () {     system.out.println("the information product : ");     system.out.println("product description : "+product.getname()); }