java Memory model

Yahoo! Calendar "Add Event" Seed URL Parameters

I can't seem to find any official documentation on this, so here are my notes. Some information gathered from http://richmarr.wordpress.com/tag/calendar/ Other information gathered through trial and error, and close examination of the "Add Event" form on Yahoo!'s site. Yahoo! Calendar URL Parameters Parameter Required Example Value Notes v Required 60 Must be 60 . Possibly a version number? TITLE Required Event title Line feeds will appear in the confirmation screen, but will not be saved. May not contain HTML. ST Required 20090514T180000Z Event start time in UTC. Will be converted to the user's time zone. 20090514T180000 Event start time in user's local time 20090514 Event start time for an all day event. DUR value is ignored if this form is used. DUR 0200 Duration of the event. Format is HHMM, zero-padded. MM may range up to 99, and is converted into hours appropriately. HH values over 24 hours appear to be modulated by 24. Durations t...

Java Identifiers

Language Fundamentals Java Identifiers: A name in a java Program is called an Identifier, Which can be used for representing classes, methods, variables and labels. Rules: 1. Java Identifier is composed of a sequence of characters, where each character may be a ASCII Latin letters A–Z(\u0041–\u005a), and a–z (\u0061–\u007a) and for historical reasons , the ASCII underscore (_, or \u005f) and dollar sign ($, or \u0024) and ASCII digits 0-9 (\u0030–\u0039). i.e A-Z,a-z,_,$,0-9 The $ character should be used only in mechanically generated source code or, rarely, to access pre-existing names on legacy systems. If we use other character we will get compiled time error saying illegal character. 2. No identifier starts with the digit. 3. There is no length limit for java identifier, but SUN highly recommended up to 15 characters. 4. Identifiers in java are case sensitive. 5. We are not allowed to use reserved words (java keywords) as identifier. 6 . All predefin...

Immutable class with mutable member fields in java

Immutable class is a class which once created, it's content can not be changed. Immutable classes are good choice for HashMap key as their state cannot be changed once they are created. Objects of immuable classes are also thread safe as threads can not change the value of its fields once it is created. Creating a basic immutable class is very easy, but as you dig deep you will start facing many challenges. This makes Immutability a very famous interview topic for mid level java developers. This article is a continuation of our article How to create Immutable Class in Java where we have discussed about creating basic immutable class using traditional approach as well as using Builder Design Pattern approach. In this article, we will discuss about How we will achieve immutability, if it has member variables of any third party class which is mutable. Or what will you do if you have reference of any...

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