ScriptVariables sv = new ScriptVariables(); is creating a different instance than the one for which you previously set its fields (foodName and amount). This new instance has its foodName and amount fields still not initialized, hence the null and zero values.

Assuming your second class is ScriptVariablesAccessor, then you can include a field of type ScriptVariables in its class definition. This field would then be used to pass the previously filled instance via a constructor or a setter method.

public class ScriptVariablesAccessor {
   private ScriptVariables sv;

   public ScriptVariablesAccessor(ScriptVariables sv) {
      this.sv = sv;
   }

   // or use a setter
   public void setScriptVariables(ScriptVariables sv) {
      this.sv = sv;
   }

   public void processVariables() {
      String foodName = sv.getFoodName();
      int amount = sv.getAmount();
      // do something with foodName and amount;
   }
}

Below is how you would call this class with the prepared ScriptVariables:

ScriptVariablesAccessor svAccessor = new ScriptVariablesAccessor(sv);
svAccessor.processVariables();

I faced the same issue, Maybe you need to add one Lombok plugin, that will fix the issue at least for me or others

Could you please refer the below pages? And follow the steps to add the Lombok plugin

Solution 1

Solution 2

Solution 3

Please refer IntelliJ

Please refer Eclipse/STS

try this

ageProgram.java

import java.util.Scanner;

public class ageProgram {
    public static void main(String[]args) {
        Scanner keyboard = new Scanner(System.in);
        System.out.println("enter your birth year");
        int yearBirth = keyboard.nextInt();
        System.out.println("enter a (future) year");
        int yearTo = keyboard.nextInt();

        ageCalculator agecalculator = new ageCalculator(yearBirth, yearTo);

        if (yearBirth > yearTo) {
            System.out.format("You will be born in %s years", agecalculator.getYear());
        } else {
            System.out.format("You are %s years old", agecalculator.getYear());
        }
    }
}

ageCalculator.java

public class ageCalculator {
    String yearText;
    public ageCalculator(int yearBirth, int yearTo) {
        if (yearBirth > yearTo) {
            int year = (yearBirth - yearTo);
            yearText = String.valueOf(year);
        } else {
            int year = (yearTo - yearBirth);
            yearText = String.valueOf(year);
        }
    }
    public String getYear() {
        return yearText;
    }
}

if you don't understand it, i can explain

edit: i didn't get it at first but the above answer is also correct. you should use agecalculater.getYear() to call the method edit: you should start a class name with a capital letter. and you can use

yearText = String.valueOf(yearBirth - yearTo);

instead of

int year = (yearTo - yearBirth);
yearText = String.valueOf(year);

in all your sysout statements you are trying to access getter without () this.

please try this

 System.out.println(pers[i].getName()); //change all your getters

instead of

 System.out.println(pers[i].getName);

because getName() is a method not a Variable so always you need to use open-close braces () just after the method name (either you defining or calling) .

please change all these methods (methods which raise an compile-time Error).

System.out.println(pers[i].getName);
System.out.println(pers[i].getAddress); //all these lines are causing of Compile time error.
System.out.println(pers[i].getAge);
System.out.println(pers[i].getPhoneNumber);

You should use

sum = sum + team[i].getAverage();

Your constructor should call your setters, and you should check your logic in the setters. Do you really want to carry on with the value of 1 if the calling code passes a negative value?

difficultLvl is an instance variable, so it has a value for each instance. Every time you create a new instance of Game, it has its own diffucultLvl initialized to 0. If you set the difficultLvl in one Game, it doesn't change it for other Game instances and it doesn't affect future new Game instances.

private void btnOkMouseClicked(java.awt.event.MouseEvent evt) {                                   
        dispose();
        MainGame m2 = new MainGame(this);
        m2.setDifficulty(jComboBox1.getSelectedIndex());
}      

In this code, you create a game, MainGame m2 = new MainGame(), but it has default difficulty, which is what is printed in the constructor. Next, you set its difficulty level (if you print the difficulty after this, it will be right). Then game is thrown away: it goes out of scope - it was only a local variable.