为什么薪酬租金方法不能正常运作？

Question

好的，所以我有两个类：一个用于玩家，一个用于属性。

public class Player {
int money = 1500;
Object NamePlayer;
String Names;
ArrayList properties = new ArrayList(15);

public Player(String Name) {
    Names = Name;

}      
public void recieve(int ammount){
    money = money + ammount;
}
public void payment(int ammount){
    money = money - ammount;
}
public void addProperty(Property name){
    if (name.Value > money){
        System.out.println("Sorry, You dont have enough money!");
    }else{
        money -= name.Value;
        properties.add(name.Name);
        name.setOwner(this, name);
    }    
}

和属性类

public class Property {
String Name;
int Value;
int House1Value;
int House2Value;
int House3Value;
int House4Value;
int Hotel1Value;
int Hotel2Value;
int Hotel3Value;
int Hotel4Value;
int Houses;
int Hotels;
int Rent;
Object Owner;

public Property(int value, int houses, int hotel, int rent, 
        int house1,int house2,int house3,int house4, int hotel1,
        int hotel2,int hotel3,int hotel4, String names){

    Value = value;
    Houses = houses;
    Hotels = hotel;
    Rent = rent;
    House1Value = house1;
    House2Value = house2;
    House3Value= house3;
    House4Value= house4;
    Hotel1Value= hotel1;
    Hotel2Value= hotel2;
    Hotel3Value= hotel3;
    Hotel4Value= hotel4;
    Name = names;

}
public int addHotel(int numHotel){

    if (Hotels < 4){
    Hotels += numHotel;
    return Hotels;  
    }else{
       System.out.println("Sorry, You must Purchase more Houses to do that.");
    }
    return 2;
 }
public int addHouse(int numHouse){
    if (Houses < 4){
        Houses += numHouse;
    }else{
        Houses = Houses;
    }

    return Houses;
}
public int determineRent(int numHouse, int numHotel){
    if (numHotel == 4){
        Rent += Hotel4Value;
    }else if (numHotel ==3){
        Rent += Hotel3Value;
    }else if (numHotel == 2){
        Rent += Hotel2Value;
    }else if (numHotel == 1){
        Rent += Hotel1Value;
    }else if (numHouse == 4){
        Rent += House4Value;
    }else if (numHouse == 3){
        Rent += House3Value;
    }else if (numHouse == 2){
        Rent += House2Value;
    }else{
        Rent = Rent + House1Value;
    }
    return Rent;
}
public void setOwner(Player owner, Property property){
    Owner = owner.Names;

然后我的主Java文件看起来像这样

public class Monopoly {
/**
 * @param args the command line arguments
 */
public static void main(String[] args) {       
    Player Bob = new Player("Bob");
    Player John = new Player("John");
    Property Boardwalk = new Property(400,0,0,400,600,0,0,0,0,0,0,1000,"Boardwalk");
    showMoney(Bob);
    showMoney(John);
    Bob.addProperty(Boardwalk);
    System.out.println(Boardwalk.Owner);
    showRent(Boardwalk);
    payRent(John, Bob, Boardwalk);
    showMoney(John);
    showMoney(Bob);
    showRent(Boardwalk);
}
public static void showMoney(Player player){
    System.out.println(player.Names + " 's current balance is $" + player.money);
}
public static void showProperties(Player player){
    System.out.println(player.Names + " owns " + player.properties);
}
public static void showRent(Property property){
    System.out.println(property.determineRent(property.Houses, property.Hotels));
}
public static void payRent(Player player1, Player player2, Property property){
    if(property.Owner == player2.Names){
    player1.payment(property.determineRent(property.Houses, property.Hotels));
    player2.recieve(property.determineRent(property.Houses, property.Hotels));
    }else{
        System.out.println("Sorry " + player2.Names + " does not own " + property.Name + "!");
    }
}

问题是。为什么当我运行这个程序时，我得到以下内容：

鲍勃目前的余额为1500美元 约翰目前的余额是1500美元 短发 1000 约翰目前的余额为-100美元 鲍勃目前的余额为3300美元 2800

当我将相同的号码传递给每个玩家各自的方法时？