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What is the 'instanceof' operator used for in Java?
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instanceof keyword is a binary operator used to test if an object (instance) is a subtype of a given Type.
Imagine:
interface Domestic {}
class Animal {}
class Dog extends Animal implements Domestic {}
class Cat extends Animal implements Domestic {}
Imagine a dog object, cr...
Implement Stack using Two Queues
...last enqueued element in Queue 1. But that is the last pushed element only if you had queued earlier. If you popped multiple times in succession, that need not be true.
– user127.0.0.1
Apr 24 '12 at 6:01
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How to check type of variable in Java?
...uble) these are all primitives, and there are no sub-types of them. Thus, if you declare a variable to be an int:
int x;
You can be sure it will only ever hold int values.
If you declared a variable to be a List, however, it is possible that the variable will hold sub-types of List. Examples o...
Is there a conditional ternary operator in VB.NET?
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Depends upon the version. The If operator in VB.NET 2008 is a ternary operator (as well as a null coalescence operator). This was just introduced, prior to 2008 this was not available. Here's some more info: Visual Basic If announcement
Example:
Dim ...
Singleton: How should it be used
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Answer:
Use a Singleton if:
You need to have one and only one object of a type in system
Do not use a Singleton if:
You want to save memory
You want to try something new
You want to show off how much you know
Because everyone else is doing it (Se...
Remove Last Comma from a string
Using JavaScript, how can I remove the last comma, but only if the comma is the last character or if there is only white space after the comma? This is my code.
I got a working fiddle . But it has a bug.
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Check if list contains element that contains a string and get that element
...myList
.Where(stringToCheck => stringToCheck.Contains(myString));
If you simply wish to return the first matching item:
var match = myList
.FirstOrDefault(stringToCheck => stringToCheck.Contains(myString));
if(match != null)
//Do stuff
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Fastest way to check if a string is JSON in PHP?
I need a really, really fast method of checking if a string is JSON or not. I feel like this is not the best way:
30 Answer...
When to catch java.lang.Error?
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Generally, never.
However, sometimes you need to catch specific errors.
If you're writing framework-ish code (loading 3rd party classes), it might be wise to catch LinkageError (no class def found, unsatisfied link, incompatible class change).
I've also seen some stupid 3rd-party ...
Android DialogFragment vs Dialog
...g and then call the handler as appropriate:
public void onClick(.....
if (which == DialogInterface.BUTTON_POSITIVE) {
final Message toSend = Message.obtain(okMessage);
toSend.sendToTarget();
}
}
Edit
And as Message is parcelable you can save it out in onSaveInstanceState...