如何在java中创建通用单例类？

public enum Singleton<T> {
    INSTANCE;

    private T instance;

    public void setInstance(T instance) {
        this.instance = instance;
    }

    public T getInstance() {
        return instance;
    }
}

public class MyClass {
    private MyClass() {
        // 私有构造函数，防止外部实例化
    }

    public static void main(String[] args) {
        // 创建一个MyClass的实例
        MyClass myInstance = new MyClass();

        // 将MyClass的实例设置为Singleton的实例
        Singleton.INSTANCE.setInstance(myInstance);

        // 从Singleton中获取MyClass的实例
        MyClass myInstanceFromSingleton = Singleton.INSTANCE.getInstance();
    }
}