native-methods | 易学教程

NullPointerExcetion Native Method Accessor… Hashing Words Issue

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问题 I am writing a project that reads a file and sorts "Words". This code compiles correctly, yet then it gives me a null pointer exception. Any Ideas? import java.io.File; import java.io.FileNotFoundException; import java.util.Scanner; import java.util.Hashtable; public class Lab { Hashtable<String, Word> words = new Hashtable<String, Word>(); public void addWord(String s, int i) { if (words.containsKey(s)) { words.get(s).addOne(); words.get(s).addLine(i); } else { words.put(s, new Word(s));

Javascript native sort method code

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Any idea how I can view the implementation of native javascript methods specifically the sort method. The reason why I am looking for this I am just wondering what the algorithm used is and what is the complexity of the same. I am sorting a huge json object in javascript and I was wondering if I should write my own mety hod for the same. Also does the implementation differ from browser to browser? Take a look at the WebKit implementation: https://gist.github.com/964673 . Apparently, it uses min sort/selection sort. From: http://svn.webkit.org/repository/webkit/trunk/Source/JavaScriptCore

How to retrieve the file previews used by windows explorer in Windows vista and seven?

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问题 I am developing a Delphi documents management application, so somehow I am giving the user some functionality similar to windows explorer. I would like to know if there is a way to get the preview used by windows explorer. For example windows explorer creates a small thumbnail for a pdf document for example, and displays it when the user chooses to view "big icons". Is there a way to retrieve that preview? MyTImage := GiveMePreviewForFile('C:\Test\File.pdf'); 回答1: @user193655, using the

Javascript native sort method code

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问题 Any idea how I can view the implementation of native javascript methods specifically the sort method. The reason why I am looking for this I am just wondering what the algorithm used is and what is the complexity of the same. I am sorting a huge json object in javascript and I was wondering if I should write my own mety hod for the same. Also does the implementation differ from browser to browser? 回答1: Take a look at the WebKit implementation: https://gist.github.com/964673. Apparently, it

How to import a class from default package

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问题 Possible Duplicate: How to access java-classes in the default-package? I am using Eclipse 3.5 and I have created a project with some package structure along with the default package. I have one class in default package - Calculations.java and I want to make the use of that class in any of the package (for instance in com.company.calc ). When I try to make the use of the class which is in the default package, it\'s giving me a compiler error. It\'s not able to recognise the class in default