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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...
Get host domain from URL?
how to get host domain from a string URL?
9 Answers
9
...
Storing Objects in HTML5 localStorage
... in HTML5 localStorage , but my object is apparently being converted to a string.
22 Answers
...
Assert equals between 2 Lists in Junit
...it's easy to just do this:
@Test
public void test_array_pass()
{
List<String> actual = Arrays.asList("fee", "fi", "foe");
List<String> expected = Arrays.asList("fee", "fi", "foe");
assertThat(actual, is(expected));
assertThat(actual, is(not(expected)));
}
If you have a recent v...
Spring Test & Security: How to mock authentication?
...ller {
@Secured("ROLE_MANAGER")
@GetMapping("/salute")
public String saluteYourManager(@AuthenticationPrincipal User activeUser)
{
return String.format("Hi %s. Foo salutes you!", activeUser.getUsername());
}
}
Here we have a get mapped function to the route /foo/salute ...
New line in text area
...
I've found String.fromCharCode(13, 10) helpful when using view engines.
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/fromCharCode
This creates a string with the actual newline characters in i...
What are the “standard unambiguous date” formats for string-to-date conversion in R?
...
This is documented behavior. From ?as.Date:
format: A character string. If not specified, it will try
'"%Y-%m-%d"' then '"%Y/%m/%d"' on the first non-'NA' element,
and give an error if neither works.
as.Date("01 Jan 2000") yields an error because the format isn'...
Converting a column within pandas dataframe from int to string
...
@DmitryKonovalov in python strings are immutable, so whenever you manipulating the data, you have to put the result back in to the variable.
– Sriram Arvind Lakshmanakumar
Jan 10 '19 at 10:36
...
How to convert enum value to int?
...ze it fails myEnumValue = MyEnum.valueOf(myInt); the arg has to be of type String - or is there something I am missing?
– likejudo
Sep 10 '14 at 22:58
...
The ViewData item that has the key 'MY KEY' is of type 'System.String' but must be of type 'IEnumera
...
Try adding a string for the name of your dropdown list as the first parameter, and get the item out of your viewdata:
<%= Html.DropDownList("SomeDropdownName", (IEnumerable<SelectListItem>)ViewData["basetype"]) %>
Here is ...