tailieunhanh - HandBooks Professional Java-C-Scrip-SQL part 3

Tham khảo tài liệu 'handbooks professional java-c-scrip-sql part 3', công nghệ thông tin, kỹ thuật lập trình phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | . New Horizons Keep in mind that I m a cynic at heart. When it comes to technologies it takes a whole lot of effort to get me excited. I still have never written a web service at least with the massive IBM and Microsoft stacks and I didn t write my first EJB until 2003. I ve never written an EJB entity bean unless it was to build a case against them and never will. I ve instead preferred simpler architectures like REST POJO programming transparent persistence and Spring. Even then I was late to those parties. It s even tougher to get me to play with a new language. Dave Thomas a highly respected programmer and a gifted teacher is fond of saying that you should learn a new programming language every couple of months. I ve probably averaged one every five years and I rarely do more than dabble. But recently in my dabbling I ve found a couple of startling innovations. These frameworks had ideas that just about reached out and ripped me out of my chair this year. I ve taken a little more time than usual to survey the interesting innovations around new programming languages. When it comes to building web pages and application servers two ideas have my undivided attention metaprogramming like Ruby on Rails and continuation servers like Seaside on Smalltalk . Neither of these two innovations is happening with much impact in Java. You ll get a deeper treatment in Chapters 7 and 8 but it s enough to say for now that they are both many times more productive than their Java alternatives. . Dynamic Languages Java is a language with many compromises . Many of the features of Java are appropriate for building operating system extensions and middleware but limit application development. Consider this Ruby fragment something Owls and Ostriches puts something These simple little lines of code print Owls and Ostriches four times. Look at the power in this language You don t have to worry about details like typing if you don t want to. If it walks like a duck and .