For JAVA portal users, download PPT and source code for free Many netizens asked me if I had any shortcuts for learning Java, and I said, "no, only hand." But I am willing to learn some of my learning experience to write, so that the later comers to less detours, to help others is the greatest happiness! To learn Java well, you should first know the general classification of Java. We know that since Sun launched Java, it has been trying to make it all over the world, so the Java development is now divided into three main parts: J2SE,J2ME and J2EE, which is the Open Net Environment. J2SE is the standard version of Java2, which is mainly used for desktop application programming; J2ME is mainly used for embedded system development, such as mobile phone and PDA programming; J2EE is the enterprise version of Java2, which is mainly used for the development of distributed web applications, such as e-commerce websites and ERP systems. J2SE development desktop applications are less obvious than traditional development languages such as VC,VB and DELPHI. J2ME is a bit more esoteric for beginners, and it's hard for a general developer to have a development environment. So now the most widely used and most learned is J2EE. J2EE includes many components, such as JSP, Servlet, JavaBean, EJB, JDBC, JavaMail, etc. It's not a day or two to learn. So how do you learn J2EE? Of course, the Java syntax should be looked at first, I/O package, Util package, Lang package are you familiar with? Then from the JSP. If you've learned HTML, it's a lot easier to do, but if not, then you need to make up the HTML foundation. its

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