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How to sort List of objects by some property
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Either make ActiveAlarm implement Comparable<ActiveAlarm> or implement Comparator<ActiveAlarm> in a separate class. Then call:
Collections.sort(list);
or
Collections.sort(list, comparator);
In general, it's a good idea to implement Comparable<T> ...
Changing variable names in Vim
...will select the whole scope.
Press :s/ - start of the substitute command.
<C-R>/ - will insert pattern that match variable name (that name you were on before pressing gd).
/newname/gc<CR> - will initiate search and replace with confirmation on every match.
Now you have to record a macro...
Covariance, Invariance and Contravariance explained in plain English?
...if neither of the above holds
Let's consider an example. Let f(A) = List<A> where List is declared by
class List<T> { ... }
Is f covariant, contravariant, or invariant? Covariant would mean that a List<String> is a subtype of List<Object>, contravariant that a List<O...
How do I cancel form submission in submit button onclick event?
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You are better off doing...
<form onsubmit="return isValidForm()" />
If isValidForm() returns false, then your form doesn't submit.
You should also probably move your event handler from inline.
document.getElementById('my-form').onsubmit = func...
How to find the most recent file in a directory using .NET, and without looping?
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Shouldn't this use FirstOrDefault() instead of First()? The latter will cause an InvalidOperationException if the directory is empty.
– Tobias J
May 26 '15 at 22:26
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How to style the with only CSS?
How can I style <option> s of a <select> element with cross-browser compatibility? I know many JavaScript ways which customize the dropdown to convert into <li> , which I'm not asking about.
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How to read json file into java with simple JSON library
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Reading from JsonFile
public static ArrayList<Employee> readFromJsonFile(String fileName){
ArrayList<Employee> result = new ArrayList<Employee>();
try{
String text = new String(Files.readAllBytes(Paths.get(fileName)), Standa...
Validate that a string is a positive integer
...document.getElementById(id);
}
function test(str, expect) {
var result = isNormalInteger(str);
console.log(
str + ": " +
(result ? "Yes" : "No") +
(expect === undefined ? "" : !!expect === !!result ? " <= OK" : " <= ERROR ***")
);
}
gid("btn").addE...
Cross-browser custom styling for file upload button [duplicate]
...without restricting you to browser-defined input dimensions. Just use the <label> tag around a hidden file upload button. This allows for even more freedom in styling than the styling allowed via webkit's built-in styling[1].
The label tag was made for the exact purpose of directing any click...
CustomErrors mode=“Off”
...p to the provider. Because of the customErrors mode, all I see is the default "Runtime error" message, instructing me to turn off customErrors to view more about the error.
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