If you have a really high level object that contains a lot of subobjects, like a car contains thousands of parts, it can get absurd to created a method in car for every access to a subobject. For example, devices that must be opened, diagnostics run, booted, executed, and then closed on a certain event may create an ABC called Device that has a method called LifeCycle which calls all other methods in turn thus running through all phases of a device's life
Java SE 6 Release Notes - Microsoft Windows Installation (32-bit)
Creating source files in Notepad - In Microsoft Windows, when you create a new file in Microsoft Notepad and then save it for the first time, Notepad normally adds the .txt extension to the filename. Check the download file size (Optional) If you save the self-installing executable to disk without running it from the download page at the web site, notice that its byte size is provided on the download page
Java synchronized keyword is re-entrant in nature it means if a java synchronized method calls another synchronized method which requires same lock then current thread which is holding lock can enter into that method without acquiring lock. If you have more than one JVM and need to synchronized access to a shared file system or database, the Java synchronized keyword is not at all sufficient
Frequently Asked Questions (FAQ) - The Go Programming Language
Your favorite feature may be missing because it doesn't fit, because it affects compilation speed or clarity of design, or because it would make the fundamental system model too difficult. Why does Go not have variant types? Variant types, also known as algebraic types, provide a way to specify that a value might take one of a set of other types, but only those types
Code Conventions for the Java Programming Language: 9. Naming Conventions
Identifier Type Rules for Naming Examples Packages The prefix of a unique package name is always written in all-lowercase ASCII letters and should be one of the top-level domain names, currently com, edu, gov, mil, net, org, or one of the English two-letter codes identifying countries as specified in ISO Standard 3166, 1981. They can also give information about the function of the identifier-for example, whether it's a constant, package, or class-which can be helpful in understanding the code
Shaw quoted :- In the past, if you linked in a normal .LIB file, then you had linked in every function that was contained in that file, whether you used them are not. You can use the WinObj object viewer (Google for it) to view all hardware device objects, driver objects and other objects currently existing in your system
If you're allocating native resources (memory on the native heap, file descriptors, or whatever), it can be significantly more difficult to arrange timely collection of these resources. There are also huge differences between devices with and without a JIT: the best code for a device with a JIT is not always the best code for a device without
Support - Frequently Asked Questions - The ACE ORB
(If you use MPC to generate your project settings, the last step is done for you automatically.) See the TAO Developer's Guide for more information and examples. Q: How can I have some objects available to one interface and the rest available on another? A: There are two key techniques you can use in this situation
LIBSVM FAQ
large -m) on a linux machine, why sometimes I get "segmentation fault ?" How do I disable screen output of svm-train? I would like to use my own kernel. What should I do? Q: Some courses which have used libsvm as a tool Institute for Computer Science, Faculty of Applied Science, University of Freiburg, Germany Division of Mathematics and Computer Science
Beginners Introduction to State Management Techniques in ASP.NET - CodeProject
See security constraints later in this article Expires A DateTime value specifies the expiry time of the cookie HttpOnly Cookies can be accessed using java script. Producing Hackable URLs URLs should be hackable, which means that, a user should be able to easily navigate from page to page by modifying the QueryString values
FindBugs Bug Descriptions
Requiring callers to pass only String constants or interned strings to a method is unnecessarily fragile, and rarely leads to measurable performance gains. If a connected set of objects beings finalizable, then the VM will invoke the finalize method on all the finalizable object, possibly at the same time in different threads
This applies also to arrays, because arrays are objects; if a final variable holds a reference to an array, then the components of the array may be changed by operations on the array, but the variable will always refer to the same array. See the paper Dynamic Class Loading in the Java Virtual Machine, by Sheng Liang and Gilad Bracha, in Proceedings of OOPSLA '98, published as ACM SIGPLAN Notices, Volume 33, Number 10, October 1998, pages 36-44, and The Java Virtual Machine Specification, Java SE 7 Edition for more details
If the value of the constant in the outside world changes (for example, if it is legislated that pi actually should be 3.975), you will need to recompile any classes that use this constant to get the current value
memory - In Java, what is the best way to determine the size of an object? - Stack Overflow
So arrays, list, or map all those collection won't be going to store objects really (only at the time of primitives, real object memory size is needed), it will store only references for those objects. Primitive types are: boolean and byte: 1 byte char and short: 2 bytes int and float: 4 bytes long and double: 8 bytes Arrays follow the same rules; that is, it's an object reference so that takes 4 (or 8) bytes in your object, and then its length multiplied by the size of its element
java - Why are static variables considered evil? - Stack Overflow
That being said, it is important to make a distinction between regular static variables (generally considered bad), and final static variables (AKA constants; not so bad). @Jon Skeet if I create a new instance of an object now you have two things to reason about - the state within the object, and the state of the environment hosting the object
No comments:
Post a Comment