an example of a Class (aka Object) with properties (aka variable) and function(ality)

JavaApplication1.java

package javaapplication1;

public class JavaApplication1 {

    public static void main(String[] args) {
       
        Double danAmt = 1.0, joshAmt = 1000.0;
        
        SlotMachine danSlots = new SlotMachine(),
                joshSlots = new SlotMachine();
        
        danSlots.setAmount(danAmt);
        joshSlots.setAmount(joshAmt);
        
        Double dWin = danSlots.playGame(),
                jWin = joshSlots.playGame();
        
        System.out.println("cool dan played $"+danAmt+" and won $"+dWin);
        System.out.println("cool josh played $"+joshAmt+" and won $"+jWin);
    }
    
} // end class

SlotMachine.java

package javaapplication1;

public class SlotMachine {
    
    // need to store partial dollars like .25 
    private Double amount = 0.0;
    
    // good default game
    private Game game = Game.BLACKJACK;

    public enum Game {
        TEXAS_HOLDEM, BLACKJACK, KINO;
    }
    
    // users need to add money
    public void setAmount(Double amount){
        this.amount = amount;
    }
    
    // users need to play the game
    public Double playGame(){
        System.out.println("you are playing "+game.name());
        Double winnings = randomWinnings();
        return winnings;
    }
    
    private Double randomWinnings(){
        Double seed = Math.random(),
                winnings = this.amount * seed * 2;
        return winnings;
    }
    
}