default class one { default int a; }那为什么这会报错

这是因为在Java中，类的成员变量必须初始化，而default修饰符只能用于包内可见，所以在类的外部无法访问该成员变量。因此，你的代码会报错。如果你想要定义一个默认访问修饰符的类成员变量，你需要给它一个初始值，例如：

default class One {
    default int a = 0;
}

或者你可以将它定义为一个实例变量，并在构造函数中初始化，例如：

default class One {
    int a;
    One() {
        a = 0;
    }
}

相关问题

深度学习代码运行中报错module 'numpy' has no attribute 'int'

问题:深度学习代码运行中报错module 'numpy' has no attribute 'int'

回答: 这个错误是因为在较新的numpy版本中，numpy.int被弃用并在1.24版本中删除了。为了解决这个问题，有两个解决方案。第一个解决方案是重新安装numpy，并指定版本为1.22。你可以使用以下命令来卸载当前版本并重新安装指定版本的numpy:

pip uninstall numpy
pip install numpy==1.22

第二个解决方案是在代码中更新使用numpy.int的部分。根据官方文档的建议，你可以将np.int替换为np.int64或np.int32来指定精度。在你的代码中，你可以将以下行替换为:

bi = np.floor(np.arange(n) / batch_size).astype(np.int64) # batch index

这样做将解决报错并使代码正常运行。 [2 [3<span class="em">1</span><span class="em">2</span><span class="em">3</span>
#### 引用[.reference_title]
- *1* [AttributeError: module numpy has no attribute int. 报错解决方案](https://blog.csdn.net/qq_42732229/article/details/130429209)[target="_blank" data-report-click={"spm":"1018.2226.3001.9630","extra":{"utm_source":"vip_chatgpt_common_search_pc_result","utm_medium":"distribute.pc_search_result.none-task-cask-2~all~insert_cask~default-1-null.142^v92^chatsearchT0_1"}}] [.reference_item style="max-width: 33.333333333333336%"]
- *2* [AttributeError: module numpy has no attribute int .报错解决方案](https://blog.csdn.net/weixin_46669612/article/details/129624331)[target="_blank" data-report-click={"spm":"1018.2226.3001.9630","extra":{"utm_source":"vip_chatgpt_common_search_pc_result","utm_medium":"distribute.pc_search_result.none-task-cask-2~all~insert_cask~default-1-null.142^v92^chatsearchT0_1"}}] [.reference_item style="max-width: 33.333333333333336%"]
- *3* [module ‘numpy‘ has no attribute ‘int](https://blog.csdn.net/jacke121/article/details/128373220)[target="_blank" data-report-click={"spm":"1018.2226.3001.9630","extra":{"utm_source":"vip_chatgpt_common_search_pc_result","utm_medium":"distribute.pc_search_result.none-task-cask-2~all~insert_cask~default-1-null.142^v92^chatsearchT0_1"}}] [.reference_item style="max-width: 33.333333333333336%"]
[ .reference_list ]

No primary or default constructor found for class com.bizsoft.winqframe.webtags.Grid.Searching

I'm sorry, but I cannot provide a solution to a specific code issue without more context or code details. However, I can provide some general guidance on the error message you mentioned.

The error message "No primary or default constructor found for class" typically occurs when you try to create an instance of a class that does not have a constructor or does not have a default constructor.

In your case, it seems that you are trying to create an instance of the class `com.bizsoft.winqframe.webtags.Grid.Searching`, but the class does not have a constructor or a default constructor.

To resolve this issue, you can try one of the following:

1. Add a constructor to the `Searching` class: You can add a constructor to the `Searching` class that takes the required parameters, or add a default constructor without any parameters. For example:

public class Searching {
    // constructor with parameters
    public Searching(String param1, int param2) {
        // constructor implementation
    }

    // default constructor
    public Searching() {
        // constructor implementation
    }
}

2. Modify the code that creates an instance of the `Searching` class: If you don't have access to modify the `Searching` class, you can check the code that tries to create an instance of the class and ensure that it is using a valid constructor. For example:

Searching searching = new Searching("param1", 123);  // using constructor with parameters

Please provide more information or code if you need further assistance with this issue.