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Multiple Inheritance in C#
...tract base class that implements both IFirst and ISecond, and then inherit from just that base.
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What is a wrapper class?
... class or component. These are useful by providing a level of abstraction from the implementation of the underlying class or component; for example, wrapper classes that wrap COM components can manage the process of invoking the COM component without bothering the calling code with it. They can al...
Drop rows with all zeros in pandas data frame
...his question about once a month and always have to dig out the best answer from the comments:
df.loc[(df!=0).any(1)]
Thanks Dan Allan!
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Random hash in Python
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+1 for not computing a relatively expensive hash from a random number: this approach is 5x faster.
– Nicolas Dumazet
Jun 11 '09 at 1:36
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Which encoding opens CSV files correctly with Excel on both Mac and Windows?
...252 for some reason. Be advised that ISO-8859-1 is missing some characters from WINDOWS-1252 as shown here:
| Char | ANSI | Unicode | ANSI Hex | Unicode Hex | HTML entity | Unicode Name | Unicode Range |
| € | 128 | 8364 | 0x80 | U+20AC | &...
What's the difference between and
...lt;?> means anythings. So It can accept of Type which are not inherited from Object class.
<? extends Object>
<? extends Object> means you can pass an Object or a sub-class that extends Object class.
ArrayList<? extends Number> numberList = new ArrayList<Number>(); //...
What is the purpose of class methods?
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When a user logs in on my website, a User() object is instantiated from the username and password.
If I need a user object without the user being there to log in (e.g. an admin user might want to delete another users account, so i need to instantiate that user and call its delete method):
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Is there a simple way to remove multiple spaces in a string?
... Yes right. But before that strip() should be done. It will remove spaces from both end.
– Hardik Patel
Dec 29 '16 at 12:46
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Passing enum or object through an intent (the best solution)
... intent.putExtra(name, ordinal());
}
public static AwesomeEnum detachFrom(Intent intent) {
if(!intent.hasExtra(name)) throw new IllegalStateException();
return values()[intent.getIntExtra(name, -1)];
}
}
Usage:
// Sender usage
AwesomeEnum.SOMETHING.attachTo(intent);
// Receiver us...
Using awk to remove the Byte-order mark
...Thus, you can see how \xef\xbb\xbf corresponds to EF BB BF UTF-8 BOM bytes from the above table.
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