1, Java EE 和 Java SE
Java SE (Java Platform Standard Edition) Standard Edition: java-based content is the main stage of learning, the technology is the core technology of java, for small development projects.
Java EE (Java Platform Enterprise Edition) Enterprise Edition: In order to develop applications in an enterprise environment to provide a solution. The technology system included techniques such as Servlet Jsp, etc., aimed at Web application development (large projects).
2, Java language development kit
JDK (Java Development Kit Development): contains JAVA runtime environment (JVM + Java system class library) and JAVA tools.
JRE (Java Runtime Environment Java Runtime Environment): contains the java virtual machine, java base class library.
JVM (Java virtual machine Java Virtual Machine): to achieve the core cross-platform, different platforms have different jvm, jvm able to identify bytecode files (.class source files generated by the compiler bytecode file).
3, JDK use
javac (compiler): compile java files
java: compile the class file
4, cmd window shortcuts
windows + R: Open cmd
d :: into the disc D
cd + Folder name: enter the folder
cd \: retreat into the root directory
cd ..: one folder on retreat
dir: display all the contents of the current directory
cls: clear screen
5, eclipse shortcuts
Automatically filled main method: main + alt + /
Automatically filled output statement: syso + alt + /
Format: Right-code area ---- Source ----- Format
Package guide: ctrl + shift + O
Comment:
Single line: Add: ctrl + / Cancel: ctrl + /
Multiline: Add: ctrl + shift + / canceled: ctrl + shift + \