Closed. This question does not meet Stack Overflow guidelines. It is not currently accepting answers.
We don’t allow questions seeking recommendations for books, tools, software libraries, and more. You can edit the question so it can be answered with facts and citations.
Closed 8 years ago.
Improve this question
I just started learning java and came across something that I havent seen before in one of the examples I was looking at, can anyone tell me how is this int variable defined? and is this used only in java or can be used in other languages? a link or document explaining it would be nice too, thanks in advance
int a = 10;
int b = (a >> 24) & 255;
b is defined to b the result of the bit operations (a >> 24) & 255
you can read about this operations here
This is shift operator in java
int a = 10;
it it represented in binary 1010
int b = (a >> 1);
This means 1010 one bit shifted and new binary will be 0101 and it is 5 in decimal
Related
Closed. This question does not meet Stack Overflow guidelines. It is not currently accepting answers.
We don’t allow questions seeking recommendations for books, tools, software libraries, and more. You can edit the question so it can be answered with facts and citations.
Closed 4 years ago.
Improve this question
I am looking for Opensource Java library which could help me in expanding all the possible values out of Numeric Regex, for example: if I give a range 1234[7-9] as input, it should output 12347,12348, 12349, similarly taking care of 123[4-6][7-9], which would translate to 12347, 12357, 12367 so on. Instead of reinventing wheel I would like to know if there are any libraries which could do this. This is only for Numeric regex with defined range.
I have once tried out Xeger which was good enough for such simple expressions similar to yours above. You will also need automaton jar package, that you can download as a library in order to use Xeger.
Example how to use:
String regex = "123[4-6][7-9]";
Xeger generator = new Xeger(regex);
Set<String> generated = new HashSet<>();
for (int i = 0; i < 100; i++) {
generated.add(generator.generate());
}
System.out.println(generated);
//[12367, 12348, 12359, 12349, 12357, 12368, 12369, 12347, 12358]
Closed. This question does not meet Stack Overflow guidelines. It is not currently accepting answers.
We don’t allow questions seeking recommendations for books, tools, software libraries, and more. You can edit the question so it can be answered with facts and citations.
Closed 6 years ago.
Improve this question
I was wondering is there a kind of algorithm or pattern which allows you to compare and find similar words
It will be easier if I use example, here it is:
Supposing that we have a strig:
String keywords = "Mummy's girl";
ArrayList = "Mom, cat, dog, girlfriend, house, mum, girls, fire";
I want to get in result those words (cause they're similar or the same in writing) = "Mom, girlfriend, mum, girls, girl"
Your question is little bit unclear. But in java you can use substring function.
String n = in.next();
String a = n.substring(0,3);
Here, a = Mum . Then go through all elements in the arraylist and find the similar word. In substring 0 is starting point and 3 is ending point.
Closed. This question does not meet Stack Overflow guidelines. It is not currently accepting answers.
We don’t allow questions seeking recommendations for books, tools, software libraries, and more. You can edit the question so it can be answered with facts and citations.
Closed 7 years ago.
Improve this question
I have some questions on collision detection. I am using LWJGL for my game in java. I have no experience in this subject and have been following the thin matrix OpenGL tutorials for the core of the game. I have experience in html, css, c++ and, of course, java.
I have been searching all over the web and have not found anything useful.
What is the simplest way to implement 3D collision detection in my games?
I would suggest using a 3d engine that recognizes collision for you like jMonkey. jMonkey can use LWJGL. There is an awesome tutorial here : http://wiki.jmonkeyengine.org/doku.php/jme3:beginner:hello_collision
If you want to roll your own like I do, I create a hash of the 3d points in space. If another object has the same hash it has near collision.
import static java.lang.System.out;
public class App {
public static int hash(float x, float y, float z) {
double hash = (((x * 31) + (y * 37) + (z * 41)));//31,37 and 41 are prime numbers
return (int) (hash);//multiplying the hash by 1000 for example may increase the accuracy significantly. Depends on the size of your space
}
public static void main(String[] args) {
for (float count = 0; count < 2; count += 0.01) {
out.println(hash(0, 0, count));
}
}
}
As you can see the hashes in the output show close collision as count increments by 0.01.
0
0
0
1
1
2
2
2
3
3
4
4
4
5
5
6
6
6
You can modify the prime numbers for higher accuracy.
Closed. This question does not meet Stack Overflow guidelines. It is not currently accepting answers.
We don’t allow questions seeking recommendations for books, tools, software libraries, and more. You can edit the question so it can be answered with facts and citations.
Closed 7 years ago.
Improve this question
While comparing two XML objects considering the following constraints :
1)Ignore white spaces
2)Ignore the array order
3)ignoring some elements containing date
Please help me consider the 3rd constraint
The following is the code that I tried :
XMLUnit.setIgnoreWhitespace(true);
XMLUnit.setIgnoreAttributeOrder(true);
DetailedDiff diff = new DetailedDiff(XMLUnit.compareXML(expectedXML, actualXML));
List<?> allDifferences = diff.getAllDifferences();
if(allDifferences.size() == 0)
System.out.println("Test Passed");
else
System.out.println("Test failed due to following differences: ");
for(int differences = 0; differences < allDifferences.size(); differences++) {
System.out.println(allDifferences.get(differences));
Closed. This question does not meet Stack Overflow guidelines. It is not currently accepting answers.
We don’t allow questions seeking recommendations for books, tools, software libraries, and more. You can edit the question so it can be answered with facts and citations.
Closed 7 years ago.
Improve this question
Is there a way in java we can convert an expression (xml or any other) to logical operations.
for example I have a property
prop01=Achivment:APPCom,done&&TODO:getforecast,!done;Achivement done
is there a way I convert it to java code like
Map userData = getUserData();
Map achivements = userData.get("achivements");
Map TODOs = userData.get("TODOs");
String achiv = achivements.get("APPCom");
String todo = TODOs.get("getforecast");
if(achiv == "done" && todo != "done")
system.out.println("Achivement done"); // part after ; in expression
any third party available for this kind of task?
I don't think this can be done with any third party library directly. You may need to use some library like Antlr to write a translator to translate from your expression to your Java code.