In the real development if using a text editor tool for development, it is basically impossible because of low development efficiency How to improve development efficiency?
Using the IDE, IDE integrated development environment using tools common tools Eclipse, IDEA, STS / MyEclipseEclipse in development steps: 1, File-new --java project to build java projects
2, src directory for storing source code
3, right-click the src-new new-class
. 4, IDE tools automatically generates Setup Wizard corresponding class code structure
5, enter the java code in IDE tool, thereby performing program
6, the input is complete press [ctrl + s] save, save IDE tools automatically compiled bytecode form .class files
7, containing the main method in class right -run-java application, will be automatically executed java program executed structure will be displayed first in compiling the source code view window Console binary byte code (not the bytecode the machine language), and then rely on a variety of different virtual machines on the platform interpreted bytecode. In order to achieve "a compile, execute everywhere" cross-platform features. However, the compiled byte code execution every time need to consume a certain period of time, while it also reduces the performance of Java programs Java Main branch to some extent
JavaSE: Java Standard Edition, suitable for the development of desktop systems and low-end business applications formerly J2SE, after 2005 changed its name JavaSE Java language core classes: database connectivity, interface definitions, input / output and network programming
JavaEE: Java enterprise Edition, providing solutions for e-commerce and Web services architecture predecessor J2EE, 2005 after the de facto standard JAVA SE renamed contains all the classes, and also contains classes for Zone enterprise applications, such as EJB, Servelet, JSP. XML ... J2EE has become the development of e-commerce applications
2017 JavaEE Oracle decided to hand over to the Eclipse Foundation open source community, but do not want to continue to use Java JavaEE this name, although Eclipse made a fight, but it seems there is nothing useful. The final 2018 officially changed its name JakartaEE.
Enterprise applications? For large commercial applications developed by organizations or institutions, this should have general application across the region and the complexity of the data source ---- the world's top 500
JavaME: Java Micro Edition, is the best mobile business application model formerly J2ME, 2005 after it was renamed
contains JAVA SE central classification, used in consumer electronic products, software development, such as pagers, smart cards, mobile phone, PDA and set-top boxes
