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Random shuffling of an array
...e function yourself, using for example the Fisher–Yates shuffle:
import java.util.*;
import java.util.concurrent.ThreadLocalRandom;
class Test
{
public static void main(String args[])
{
int[] solutionArray = { 1, 2, 3, 4, 5, 6, 16, 15, 14, 13, 12, 11 };
shuffleArray(solutionArray);
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How to make a Java class that implements one interface with two generic types?
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I'll say it: This is a flaw with Java. There's absolutely no reason we shouldn't be allowed to have multiple implementations of the same interface, provided that the implementations take different arguments.
– gromit190
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Is asynchronous jdbc call possible?
...creating millions of actors on a standard JVM setup.
If you're targeting Java, Akka Framework is an Actor model implementation that has a good API both for Java and Scala.
Aside from that, the synchronous nature of JDBC makes perfect sense to me. The cost of a database session is far higher tha...
How can we print line numbers to the log in java
... seen are slow. You are better off using a logging framework like that in java.util.logging package or log4j. Using these packages you can configure your logging information to include context down to the class name. Then each log message would be unique enough to know where it came from. As a r...
Difference between >>> and >>
What is the difference between >>> and >> operators in Java?
7 Answers
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How do I apply the for-each loop to every character in a String?
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@Pacerier No, the current Java compilers will never optimize code.
– RAnders00
Feb 11 '16 at 20:16
1
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How to view the contents of an Android APK file?
...install. It is written in perl (as opposed to APKTool, which is written in Java), and uses aapt for the actual decompilation. It also does not decompile attrib resources yet (which APKTool does).
The meaning of the name is "aapt", Android's resource compiler, shifted down one letter.
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What is the difference between getFields and getDeclaredFields in Java reflection
...tween the getFields method and the getDeclaredFields method when using Java reflection.
4 Answers
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How to get the first element of the List or Set? [duplicate]
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See the javadoc
of List
list.get(0);
or Set
set.iterator().next();
and check the size before using the above methods by invoking isEmpty()
!list_or_set.isEmpty()
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java.sql.SQLException: - ORA-01000: maximum open cursors exceeded
...n extremely common error in Oracle database development. In the context of Java, it happens when the application attempts to open more ResultSets than there are configured cursors on a database instance.
Common causes are:
Configuration mistake
You have more threads in your application querying...