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Search found 96 results on 4 pages for 'kunjaan'.

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• When do you use the not-short circuit operator in Java?

  - by kunjaan

  Why would you not short circuit? What would be some of the use cases for the operators (& | ) ?

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• Writing an auto-memoizer in Scheme. Help with macro and a wrapper.

  - by kunjaan

  I am facing a couple of problems while writing an auto-memoizer in Scheme. I have a working memoizer function, which creats a hash table and checks if the value is already computed. If it has been computed before then it returns the value else it calls the function. (define (memoizer fun) (let ((a-table (make-hash))) (?(n) (define false-if-fail (?() #f)) (let ((return-val (hash-ref a-table n false-if-fail))) (if return-val return-val (begin (hash-set! a-table n (fun n)) (hash-ref a-table n))))))) Now I want to create a memoize-wrapper function like this: (define (memoize-wrapper function) (set! function (memoizer function))) And hopefully create a macro called def-memo which defines the function with the memoize-wrapper. eg. the macro could expand to (memoizer (define function-name arguments body ...) or something like that. So that I should be able to do : (def-memo (factorial n) (cond ((= n 1) 1) (else (* n (factorial (- n 1)))))) which should create a memoized version of the factorial instead of the normal slow one. My problem is that the The memoize-wrapper is not working properly, it doesnt call the memoized function but the original function. I have no idea how to write a define inside of the macro. How do I make sure that I can get variable lenght arguments and variable length body? How do I then define the function and wrap it around with the memoizer? Thanks a lot.

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• Is there a way to get the list of InnerClasses through Reflection in Java?

  - by kunjaan

  Is there a way to know the inner classes that a Class has through Reflection in Java?

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• What is the difference between <E extends Number> and <Number>?

  - by kunjaan

  What is the difference between this method declaration: public static <E extends Number> List<E> process(List<E> nums){ and public static List<Number> process(List<Number> nums){ Where would you use the former?

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• Why would you have two constructors with the same signature?

  - by kunjaan

  What are the use cases of having two constructors with the same signature?

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• Which XML-RPC library do you recommend for Android?

  - by kunjaan

  I need to make my client talk to a XML-RPC service. I found a couple of interesting ones on the web like android-xmlrpc. Have you used any such libraries in your code? Which library do you recommend?

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• Echo target description in Ant

  - by kunjaan

  <target name="compile" description="Compile the File"> <echo>Compile the File </echo> <mkdir dir="${compilation-dir}" /> <javac srcdir="." classpath="another2" destdir="${compilation-dir}" /> </target> I want to echo the description of the target. Is there a better way of doing this other than duplicating it?

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• What is the difference between quicksort and tuned quicksort?

  - by kunjaan

  What is the fundamental difference between quicksort and tuned quicksort? How does Java decide to use this instead of merge sort?

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• How do I create different Objects using Google Guice?

  - by kunjaan

  I have a Module which binds an Interface to a particular implementation. I use that module to create an object. How do I create a different kind of object with the the interface bound to a different implementation? Do I need to create a new module with the Interface bound to a different implementation?

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• Is there a way to get the list of InnerClasses throught Reflection in Java?

  - by kunjaan

  Is there a way to know the inner classes that a Class has through Reflection in Java?

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• How do I iterate over Binary Tree?

  - by kunjaan

  Right now I have private static void iterateall(BinaryTree foo) { if(foo!= null){ System.out.println(foo.node); iterateall(foo.left); iterateall(foo.right); } } Can you change it to Iteration instead of a recursion?

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• Conditionally Delete in Ant

  - by kunjaan

  I want to delete the directory if the property "delete-compiled-dir" is set to true. Right now I have <target name="deleted-after-compilation" depends="compile,jar"> <condition property="${delete-compiled-dir}" value="true"> <delete dir="${compilation-dir}" /> </condition> <echo> Deleting Compiled Directory Classes </echo> </target>

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• What is the difference between an Operator and a function in Haskell?

  - by kunjaan

  I am new to Haskell and this mixture of Infix and Prefix notation is confusing me. What is the difference between an operator like '+' and a function like head? How do I write an operator 'c' which does this 1 c 1 = 2? I found this definition a ! b = True. How does Haskell know that I am defining ! and not a function a?

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• How do I store and switch over preferences?

  - by kunjaan

  I want to store some user preferences Would Enum be a good datastructure to store them? If so, how do I do it? This is the final usage of the datastructure. main(){ int my_val = PREFERENCES.BLACK; switch(PREFERENCES){ case BLACK: ... }

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• Count the number of objects in an Image

  - by kunjaan

  I am investigating the possibility of image processing to identify certain objects and also count them in an image. I will be given a picture and I need to identify the number of boxes present in that image. Does anybody have any experience with any Machine Vision/ Image Processing libraries like ImageJ, Fiji, JAI, jMagick ,Java Vision Toolkit? Which do you think is best suited for the job? What do you guys suggest? If the APIs can be used from Java, it would be better. Thank you. Edit: I am dealing with warehouse brown boxes. Yes I am talking about regular photos. The source is usually a mobile phone picture.

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• Why should I implement toString method for my Object?

  - by kunjaan

  Besides printing stuffs for the console what other use have you found for toString() method for your objects?

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• Stuck on solving the Minimal Spanning Tree problem.

  - by kunjaan

  I have reduced my problem to finding the minimal spanning tree in the graph. But I want to have one more constraint which is that the total degree for each vertex shouldnt exceed a certain constant factor. How do I model my problem? Is MST the wrong path? Do you know any algorithms that will help me? One more problem: My graph has duplicate edge weights so is there a way to count the number of unique MSTs? Are there algorithms that do this? Thank You. Edit: By degree, I mean the total number of edges connecting the vertex. By duplicate edge weight I mean that two edges have the same weight.

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• How do I Install external APKs necessary for my app in the Eclipse ADT?

  - by kunjaan

  I need to rely on external app (Barcode scanner in my case). The eclipse emulator crashes when I try to download it from within the emulator itself. Is there a way to download it using the emulator? Or Is there a way to directly install the APK and make it available for my application?

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• Third Party Libraries and Technologies very Java Programmer must be aware of?

  - by kunjaan

  I agree that this is a very subjective question but as a student of Java , I get suggested good libraries and technologies for Java by my mentors at work. For example, I was not aware of Google Guice for Dependency Injection, awesomeness of Java Reflection APIs, ORMs like Hibernate or stuffs you could do with libraries like Hadoop. I want to collect and share some of the libraries that exemplifies good java programming (so that beginners like me could code walk and emulate the coding practice), teach unique concepts to Java (for example Dependency Injections or ORM) and/or are really interesting libraries that a student like me would get to do interesting projects on (eg. Hadoop). I redited this question 3 times to make it more specific : ). I am sorry if I am really not clear in my intentions. But some kind of a list of good concepts and third party libraries for Java could really help some of my intern friends here at work. Thank you.

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• Can I ask ANT to look into .classpath for external jars?

  - by kunjaan

  Right now I have <!-- Classpath declaration --> <path id="project.classpath"> <fileset dir="${lib.dir}"> <include name="**/*.jar" /> <include name="**/*.zip" /> </fileset> </path> <!-- Compile Java source --> <target name="compile" depends="clean"> <mkdir dir="${build.dir}" /> <javac srcdir="${src.java.dir}" destdir="${build.dir}" nowarn="on"> <classpath refid="project.classpath" /> </javac> </target> Is there someway I can tell ANT to look into the eclipse's .classpath and figure out the external jars?

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• What trick does Java use to avoid spaces in >> ?

  - by kunjaan

  In the Java Generic Book, while contrasting the difference between C++ Templates and Java Generic says: In C++, a problem arises because without the space denotes the right-shift operator. Java fixes the problem by a trick in the grammar.) What is this trick?

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• How do I write the function 'twice' in Haskell?

  - by kunjaan

  I want to write 'twice' function that takes a function and an argument and applies the function twice. However the function that it receives should work on union types. eg. f a -> b f b -> c Output twice f a c f a b f b c f c error

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• How do you define a constant in PLT Scheme?

  - by kunjaan

  How do I declare that a symbol will always stand for a particular value and cannot be changed throughout the execution of the program?

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• Check if the superclass is an Object

  - by kunjaan

  I use if (clazz.getSuperclass().getName() == "java.lang.Object") Is there a better way?

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• Find a common element within N arrays

  - by kunjaan

  If I have N arrays, what is the best(Time complexity. Space is not important) way to find the common elements. You could just find 1 element and stop. Edit: The elements are all Numbers. Edit: These are unsorted. Please do not sort and scan. This is not a homework problem. Somebody asked me this question a long time ago. He was using a hash to solve the problem. I was thinking if SO has solved similar problems.

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