Changing variables using user input

I have to write a code for class. These are the requirements:

One class should be the Controller with the main method.

The other class should:

• do some action
• pass in variables
• use at least one if statement
• have private methods
• have some getters and setters.

I have done most of this. I ran into a problem where I want the user to type 'Go Forward' and then for the stamina to be decreased by five and have a message appear in the sonsole saying, "You lose 5 stamina." And also I'd like for the user to be able to type 'Rest' and for the stamina to increase by 5 (capping at 100, and for the console to say, "Stamina increased to #."

I don't know how to increase/decrease the stamina though. Whenever I try something, I get an error.

If there'es something I have that I don't need, then tell me what it is and why I should remove it. If there is something that's public and doesn't need to be, tell me why it shouldn't be. My teacher says that later on, there will be a 5 point deduction for every time something is public that doesn't need to be.

Here's the code:

Controller Class:

import java.io.*;
import java.util.Scanner;

public class Controller {
  public static void main(String[] args){

    System.out.println("Type your name here:");
    Scanner scan = new Scanner(System.in);
    String input = scan.nextLine();         
    Player playerOne = new Player(input);
          playerOne.setStrength(78);
          playerOne.setHealth(99);
          playerOne.setStamina(67);
          playerOne.printplayer();

          System.out.println("Type 'Go Forward' to move forward");
          Scanner mscan = new Scanner(System.in);
          //mscan = movement scan   
          String minput = scan.nextLine();
                if(minput.equals("Go Forward"))
                    //minput = movement input
                    System.out.println("You lose 5 stamina.");
                    //Getting an error here : 'stamina cannot be resolved to a variable'
                    System.out.println("Stamina: " + stamina);
                if(minput.equals("Rest"))   
                //Getting an error here : 'stamina cannot be resolved to a variable'
                    System.out.prinln("Stamina has been increased to " + stamina);
                     scan.close(); 
                     }
}

And the Player Class:

import java.util.Scanner;

public class Player{

        public String name; 
        private String input;
        private double health;


        public double strength;

        public double stamina;

        //Player Name
         public Player (String input){
          name = input;
       }

       //Player Health
         public void setHealth(double playHp){
             health = playHp;
       }
       //Player Strength
       public void setStrength(double playStrn){
          strength = playStrn;
       }
       //Player Stamina
       public void setStamina(double playStam){
          stamina = playStam;
       }

       public void printplayer(){
          System.out.println("name  : " + name );
          System.out.println("Health :" + health);
          System.out.println("Strength :" + strength);
          System.out.println("Stamina :" + stamina);

            }

       private void reduceStamina() {
           int stamina;

         }
    public int getStamina() {

        return 0;
    }
}

          System.out.println("Type 'Go Forward' to move forward");
          Scanner mscan = new Scanner(System.in);
          //mscan = movement scan   
          String minput = scan.nextLine();
                if(minput.equals("Go Forward"))
                    //minput = movement input
                    System.out.println("You lose 5 stamina.");
                    //Getting an error here : 'stamina cannot be resolved to a variable'
                    System.out.println("Stamina: " + stamina);
                if(minput.equals("Rest"))   
                //Getting an error here : 'stamina cannot be resolved to a variable'
                    System.out.prinln("Stamina has been increased to " + stamina);
                     scan.close(); 
                     }
}