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Give examples of functions which demonstrate covariance and contravariance in the cases of both over
...ce:
class Super {
Object getSomething(){}
}
class Sub extends Super {
String getSomething() {}
}
Sub#getSomething is covariant because it returns a subclass of the return type of Super#getSomething (but fullfills the contract of Super.getSomething())
Contravariance
class Super{
void doSom...
Is the ternary operator faster than an “if” condition in Java [duplicate]
...plied for a parameter value.
For example:
public void myMethod(int par1, String optionalPar2) {
String par2 = ((optionalPar2 == null) ? getDefaultString() : optionalPar2)
.trim()
.toUpperCase(getDefaultLocale());
}
In the above example, passing null as the String par...
How would you make a comma-separated string from a list of strings?
What would be your preferred way to concatenate strings from a sequence such that between every two consecutive pairs a comma is added. That is, how do you map, for instance, ['a', 'b', 'c'] to 'a,b,c' ? (The cases ['s'] and [] should be mapped to 's' and '' , respectively.)
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Why doesn't Python have multiline comments?
OK, I'm aware that triple-quotes strings can serve as multiline comments. For example,
17 Answers
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How can I open a URL in Android's web browser from my application?
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URLUtil is a great way to check on user entered "url" Strings
– Dan
Jun 21 '11 at 19:30
94
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javascript window.location in new tab
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window.open('https://support.wwf.org.uk', '_blank');
The second parameter is what makes it open in a new window. Don't forget to read Jakob Nielsen's informative article :)
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How to use localization in C#
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Add a Resource file to your project (you can call it "strings.resx") by doing the following: Right-click Properties in the project, select Add -> New Item... in the context menu, then in the list of Visual C# Items pick "Resources file" and name it strings.resx.
Add a string ...
Remove ALL styling/formatting from hyperlinks
...ting it, you COULD use !important, but you shouldn't. It's a bad habit to fall into.
.nav a { color:green !important; } /*I'm a bad person and shouldn't use !important */
Then it'll always be green, irrelevant of any other rule.
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Sending JWT token in the headers with Postman
...en. I just tried it out and it works for me.
Authorization: Bearer TOKEN_STRING
Each part of the JWT is a base64url encoded value.
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Javascript: Round up to the next multiple of 5
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const fn = _num =>{
return Math.round(_num)+ (5 -(Math.round(_num)%5))
}
reason for using round is that expected input can be a random number.
Thanks!!!
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