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Does adding a duplicate value to a HashSet/HashMap replace the previous value
...f HashSet, it does NOT replace it.
From the docs:
http://docs.oracle.com/javase/6/docs/api/java/util/HashSet.html#add(E)
"Adds the specified element to this set if it is not already present. More formally, adds the specified element e to this set if this set contains no element e2 such that (e==n...
What is the difference between an abstract function and a virtual function?
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Coming from Java, I was a bit perplexed why we need to make it virtual at all, until I read this: stackoverflow.com/a/1062126/193634
– Rosdi Kasim
Apr 17 '13 at 7:18
...
ArrayList vs List in C#
...to (belatedly) add to @ScottAdams point: that blog talks about issues with Java 5's implementation of generics, which is different enough from .NET's implementation that it's just not relevant to this question. Neither of the "harmful" examples mentioned in the post are problematic in .NET, so if yo...
How to fix Hibernate LazyInitializationException: failed to lazily initialize a collection of roles,
...te from AuthenticationProvider like you suggest, I get an error Caused by: java.lang.IllegalArgumentException: Can not set com.horariolivre.security.CustomAuthenticationProvider field com.horariolivre.security.SecurityConfig.authenticationProvider to $Proxy36. I get the same error if I use the add f...
Spring @Transaction method call by the method within the same class, does not work?
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Starting from Java 8 there's another possibility, which I prefer for the reasons given below:
@Service
public class UserService {
@Autowired
private TransactionHandler transactionHandler;
public boolean addUsers(List<User...
How to profile methods in Scala?
...R) = {
def print_result(s: String, ns: Long) = {
val formatter = java.text.NumberFormat.getIntegerInstance
println("%-16s".format(s) + formatter.format(ns) + " ns")
}
var t0 = System.nanoTime()
var result = block // call-by-name
var t1 = System.nanoTime()
pri...
What languages are Windows, Mac OS X and Linux written in?
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windows: C++
linux: C
mac: Objective C
android: JAVA, C, C++
Solaris: C, C++
iOS 7: Objective-C,Swift,C, C++
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Send Email Intent
...
A late answer, although I figured out a solution which could help others:
Java version
Intent emailIntent = new Intent(Intent.ACTION_SENDTO);
emailIntent.setData(Uri.parse("mailto:abc@xyz.com"));
startActivity(Intent.createChooser(emailIntent, "Send feedback"));
Kotlin version
val emailIntent = I...
Are nested try/except blocks in python a good programming practice?
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While in Java its indeed a bad practice to use Exceptions for flow control (mainly because exceptions force the jvm to gather resources (more here)), in Python you have 2 important principles: Duck Typing and EAFP. This basically mean...
Implement Stack using Two Queues
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import java.util.*;
/**
*
* @author Mahmood
*/
public class StackImplUsingQueues {
Queue<Integer> q1 = new LinkedList<Integer>();
Queue<Integer> q2 = new LinkedList<Integer>();
public int po...