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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...
How can I open a URL in Android's web browser from my application?
...
URLUtil is a great way to check on user entered "url" Strings
– Dan
Jun 21 '11 at 19:30
94
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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
...
jquery-ui sortable | How to get it work on iPad/touchdevices?
...
Tom,
I have added following code to mouseProto._touchStart event:
var time1Sec;
var ifProceed = false, timerStart = false;
mouseProto._touchStart = function (event) {
var self = this;
// Ignore the event if another widget is already being handled
if (touchH...
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...
Go Error Handling Techniques [closed]
...ome would disagree for sure, but I would argue that this is the style seen all over the standard libraries in Golang. In other words, Go authors write error handling in this way.
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File Upload in WebView
...roid 3.0+
public void openFileChooser( ValueCallback uploadMsg, String acceptType ) {
mUploadMessage = uploadMsg;
Intent i = new Intent(Intent.ACTION_GET_CONTENT);
i.addCategory(Intent.CATEGORY_OPENABLE);
i.setType("*/*");
MyWb.this.s...
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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Xcode Debugger: view value of variable
...reached during the execution of your program you will see on the left side all your variables available at that breakpoint.
You can expand the left arrows on the variable for a greater detail. And even use the search field to isolate that variable you want and see it change on real time as you "S...
Building big, immutable objects without using constructors having long parameter lists
...method on a case class. Here's some example code:
case class Person(name: String, age: Int, children: List[Person] = List()) {
def addChild(p: Person) = copy(children = p :: this.children)
}
val parent = Person(name = "Bob", age = 55)
.addChild(Person("Lisa", 23))
.addChild(Person("Peter", 1...