Java setter不更新值

Question

我正在尝试制作一个菜单系统，其中某些属性的值将在另一个类中更新。

第一种方法

 public static void startmenu(){ 
        int path;
        Scanner startscan = new Scanner(System.in); 
        System.out.println("-----------------------");
        System.out.println("Enter Shop : 1"); 
        System.out.println("Enter house : 2"); 
        System.out.println("Enter town square : 3"); 
        System.out.println("Leave town : 4"); 
        System.out.println("Check stats : 5"); 
        System.out.println("Chosen path: "); 
        System.out.println("update defence : "); 
        path = startscan.nextInt(); 
        SouthValley(path); 
    }

第二种方法与上面相同，案例6应将防御更新为50并重新启动菜单，但当我在打印25后选择案例5时

public static void SouthValley(int selectedPath){
    MainChar Stats = new MainChar();
    do {
        switch(selectedPath){
            case 1: 
                System.out.println("You Entered shop");
                System.out.println("-----------------------------");
                break;
            case 2: 
                System.out.println("You Entered you house");
                break;
            case 3: 
                System.out.println("You Entered Town Square");
                break;
            case 4:
                System.out.println("You left the town");
                FirstPath();
                break;
            case 5:
                System.out.println("--------------------------------");
                System.out.println("Defence: " + Stats.getDefence());
                System.out.println("Strength: " + Stats.getStrength());
                System.out.println("Mana: " + Stats.getMana());
                System.out.println("Health: " + Stats.gethealth());
                startmenu();
                break;
            case 6:
                Stats.setDefence(50);
                System.out.println(Stats.getDefence());
                startmenu();
                break;
            default:
                startmenu();
                break;
        }
    }
    while(selectedPath < 7);
}

具有定义变量的类

public class MainChar {
    private int health = 100;
    private int defence = 25;
    private int strength = 15;
    private int mana = 10;

    public int gethealth(){
        return health;
    }

    public int getStrength() {
        return strength;
    }

    public int getDefence() {
        return defence;
    }

    public int getMana() {
        return mana;
    }

    public void setDefence(int Newdefence) {
        this.defence = Newdefence;
    }

    public void setHealth(int Newhealth) {
        this.health = Newhealth;
    }

    public void setMana(int Newmana) {
        this.mana = Newmana;
    }

    public void setStrength(int Newstrength) {
        this.strength = Newstrength;
    }
}

我已经尝试了很多谷歌搜索，但没有找到解决方案。这段代码只是试图让值更新工作。

Answer 1

循环每次都会创建一个新的主字符。这些对象中的每一个都有自己的 int 存储作为防御。如果您创建一个新的而不是使用您之前创建的那个，它将创建一个默认值为 25 的新 Mainchar。这就是为什么你得到 25 而不是 50。