Question

嗨，有人可以告诉我如何实例化下面给出的单例类的正确方法吗？

    public class BillPughSingleton {

    private BillPughSingleton(){}

    private static class SingletonHelper{
        private static final BillPughSingleton INSTANCE = new BillPughSingleton();
    }

    public static BillPughSingleton getInstance(){
        return SingletonHelper.INSTANCE;
    }
}

Answer 1

尝试：

BillPughSingleton bill = BillPughSingleton.getInstance();

Answer 2

你可以像这样重写你的课程，不再需要SingletonHelper课程

public class BillPughSingleton {

private static BillPughSingleton INSTANCE;
private BillPughSingleton(){}

public static BillPughSingleton getInstance(){
    if (INSTANCE==null) {
        INSTANCE = new BillPughSingleton();
    }
    return INSTANCE;
}

}

对于instansiate你可以试试这个：

BillPughSingleton instance = BillPughSingleton.getInstance();

您可以找到更多其他示例here

如何实例化Bill Pugh方法中实现的单例类？

2 个答案: