public class ComputerHomework02 {
    public static void main(String[] args) {
        // TODO Auto-generated method stub

        Computer pravec = new Computer();
        pravec.year = 1998;
        pravec.price = 1000;
        pravec.isNotebook = false;
        pravec.hardDiskMemory = 40;
        pravec.freeMemory = 15;
        pravec.operationalSystem = "windows";


    void changeOperationSystem(String newOperationSystem){
             System.out.println("Write your operational system here: " +newOperationSystem);

             }