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Should switch statements always contain a default clause?
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This is an important observation! It applies even more in Java because it doesn't allow you to cast ints to enums.
– Lii
Sep 21 '15 at 7:42
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The apk must be signed with the same certificates as the previous version
...nal APK and update APK were signed with by using these commands, using the Java keytool:
keytool -list -printcert -jarfile original.apk
keytool -list -printcert -jarfile update.apk
This shows you detailed information about the how an APK was signed, for example:
Owner: CN=My App, O=My Company,...
Math.random() versus Random.nextInt(int)
...s : time:328 milesecond.
usingMathsRandom : time:187 milesecond.
package javaFuction;
import java.util.Random;
public class RandomFuction
{
static int array[] = new int[9999];
static long sum = 0;
public static void usingMathsRandom() {
for (int i = 0; i < 9999; i++) {
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Can I use my existing git repo with openshift?
... wrote a jboss tools blog which was demonstrating how to use the openshift-java-client some months ago: https://community.jboss.org/wiki/Enable-openshift-ciFullExampleUsingOpenshift-java-client . You'll spot the above steps in the last paragraph "We're almost there".
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Why would you use String.Equals over ==? [duplicate]
...'s entirely likely that a large portion of the developer base comes from a Java background where using == to compare strings is wrong and doesn't work.
In C# there's no (practical) difference (for strings) as long as they are typed as string.
If they are typed as object or T then see other answers...
What is the best algorithm for overriding GetHashCode?
...something like the implementation given in Josh Bloch's fabulous Effective Java. It's fast and creates a pretty good hash which is unlikely to cause collisions. Pick two different prime numbers, e.g. 17 and 23, and do:
public override int GetHashCode()
{
unchecked // Overflow is fine, just wrap...
When to use Hadoop, HBase, Hive and Pig?
...natively you can write sequential programs using other HBase APIs, such as Java, to put or fetch the data. But we use Hadoop, HBase etc to deal with gigantic amounts of data, so that doesn't make much sense. Using normal sequential programs would be highly inefficient when your data is too huge.
Co...
How do you properly use namespaces in C++?
I come from a Java background, where packages are used, not namespaces. I'm used to putting classes that work together to form a complete object into packages, and then reusing them later from that package. But now I'm working in C++.
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Under what conditions is a JSESSIONID created?
...about one more source of the JSESSIONID cookie:
I was just debugging some Java code that runs on a tomcat server. I was not calling request.getSession() explicitly anywhere in my code but I noticed that a JSESSIONID cookie was still being set.
I finally took a look at the generated Java code corr...
Explaining Apache ZooKeeper
...eady present, but can be written above the ZooKeeper primitives.
If the C/Java API is too unwieldy for your purposes, you should rely on libraries built on ZooKeeper such as cages and especially curator.
Where to read more
Official documentation apart, which is pretty good, I suggest to read Chap...