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How will I know when to create an interface?
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You don't have to cast, as opposed to 50 different classes with a Process method. C# doesn't use "duck typing", so just because A has Process() and B has Process() doesn't mean there is any generic way to call either. You need an Interface for...
Dynamic SELECT TOP @var In SQL Server
...sql nvarchar(200), @count int
set @count = 10
set @sql = N'select top ' + cast(@count as nvarchar(4)) + ' * from table'
exec (@sql)
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How should equals and hashcode be implemented when using JPA and Hibernate
... Cat {
...
public boolean equals(Object other) {
//Basic test / class cast
return this.catId==other.catId;
}
public int hashCode() {
int result;
return 3*this.catId; //any primenumber
}
}
In Python, how do I read the exif data for an image?
...any changes
in the output image.
As stated, the Exif output can simply be casted to a dict with the EXIF data accessible as regular key-value pairs. The keys are 16-bit integers that can be mapped to their string names using the ExifTags.TAGS module.
from PIL import Image, ExifTags
img = Image.ope...
Get margin of a View
...iewGroup and the parent was a ViewGroup as well. In most cases, you should cast your layout params to the parent's View class LayoutParams (in this case it's ViewGroup and RelativeLayout)
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Callback to a Fragment from a DialogFragment
...try {
callback = (Callback) getParentFragment();
} catch (ClassCastException e) {
throw new ClassCastException("Calling fragment must implement Callback interface");
}
}
Only thing left is to call your callback method after these steps.
For more information about the issue...
正确重置MySQL密码 - 爬虫/数据库 - 清泛IT社区，为创新赋能！
谁都不想弄丢家门钥匙，但不管多么小心，时间长了，这样的事情总会发生几次。MySQL密码也是一样，把它写在文档上不太安全，记在脑子里又难免会忘记。如果你忘记了MySQL密码，如何重置它呢？
下面是错误答案：首先停止MyS...
解决IIS发布时global_asax的dll 的CS0433冲突问题 - 环境配置 - 清泛IT社区，为创新赋能！
Server Error in '/' Application.Compilation ErrorDescription: An error occurred during the compilation of a resource required to service this request. Please review the following specific error details and modify your source code appropriately.
Compiler Error Message: CS0433: The type 'ASP.globa...
自定义下载器扩展：个性化下载进度展示 - App Inventor 2 拓展 - 清泛IT社...
Customdownloader Extension
Documentation
Event triggered when an error occurs during download.
Successful Download downloadId, filePath, fileSize, fileName
Event triggered to report download progress, speed, eta, fileSize, and downloadedSize
Download the file of given URL to t...
mobile location - App应用开发 - 清泛IT社区，为创新赋能！
通过android studio实现: 在屏幕上输入手机号码，点击确定开始查找，用gps数据确定手机的当前精确位置，精确度5米，找到后把经纬度写在两个文字框里，并在百度地图上标注出位置,并移动到屏幕中央，放大地图。
Imple...