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Why use a prime number in hashCode?
...e number of buckets is unlikely to be divisible by it (and in fact, modern java HashMap implementations keep the number of buckets to a power of 2).
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Tomcat startup logs - SEVERE: Error filterStart how to get a stack trace?
....level = INFO
org.apache.catalina.core.ContainerBase.[Catalina].handlers = java.util.logging.ConsoleHandler
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How can I use tabs for indentation in IntelliJ IDEA?
...changed a little:
File > Settings... > Editor > Code Style > Java > Tabs and Indents > Use tab character
File > Other Settings > Default Settings... > Editor > Code Style > Java > Tabs and Indents > Use tab character
File > Settings... > Editor > Co...
Clear android application user data
...tring result = stdoutReader.getResult();
The class StreamReader:
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.concurrent.CountDownLatch;
class StreamReader extends Thread {
private InputStream is;
private StringBuffer mBuffer;...
Virtual member call in a constructor
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The rules of C# are very different from that of Java and C++.
When you are in the constructor for some object in C#, that object exists in a fully initialized (just not "constructed") form, as its fully derived type.
namespace Demo
{
class A
{
public A()
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Do I need to close() both FileReader and BufferedReader?
...
no.
BufferedReader.close()
closes the stream according to javadoc for BufferedReader and InputStreamReader
as well as
FileReader.close()
does.
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LinkedBlockingQueue vs ConcurrentLinkedQueue
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This question deserves a better answer.
Java's ConcurrentLinkedQueue is based on the famous algorithm by Maged M. Michael and Michael L. Scott for non-blocking lock-free queues.
"Non-blocking" as a term here for a contended resource (our queue) means that regardle...
IntelliJ IDEA jump from interface to implementing class in Java
Is there some shortcut that would allow me after creating method in an interface, select and jump to implementing class of that interface?
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Jackson how to transform JsonNode to ArrayNode without casting?
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In Java 8 you can do it like this:
import java.util.*;
import java.util.stream.*;
List<JsonNode> datasets = StreamSupport
.stream(datasets.get("datasets").spliterator(), false)
.collect(Collectors.toList())
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How many double numbers are there between 0.0 and 1.0?
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Java doubles are in IEEE-754 format, therefore they have a 52-bit fraction; between any two adjacent powers of two (inclusive of one and exclusive of the next one), there will therefore be 2 to the 52th power different double...