# # learning
? Class time immediately practice just speak in the class code
# # common DOS command
In the DOS window: * * * *
? Windows + r & gt; CMD search CMD
Settings: * * * *
? Quick edit mode: window - & gt; Right click - & gt; Property - & gt; Convenient quick edit mode (copy and paste)
Common command: * * * *
1. Dir lists the current directory path all the content of the
2. Switch drive: drive name: (case-insensitive)
3. The CD under the path to a path
- and the more simple the relative path:
- an absolute path: where you can use the
- note: switching path across the drive, the manual switch drive
4. CD \ back to current plate FuGen directory
5. CLS please screen
6. Continue to push the switch TAB auto-completion,
7. The direction key, used to find the command
8. Shut down the exit
9. The mkdir folder name - & gt; Create the folder
The rmdir folder name
# # JDK version:
Jdk1.2
Jdk1.5
Jdk1.7
Jdk1.8
Thinking after class: they know jdk1.5, 1.7, 1.8 version of the new features (3)
# # Java code execution process:
Write the source code. Java - & gt; Through the javac compiler. The class bytecode file - & gt; Java explain run
The characteristics of the # # Java language
Simple and efficient, object-oriented, platform neutrality,
Compile once, run anywhere
Cross-platform: no virtual machine, cannot enlarge platform, Java code to run on the virtual machine
Note: is a Java class file cross-platform not source files
# # JDK installation and test
# # # installation reference document
# # # test:
? 1. Perform the Java command CMD arbitrary path
? 2. Java - check out the Java version installed version
# # your first Java program
Premise: JDK installed successfully
1. Create a new file HelloWorld. Java
2. Write a Java program - & gt; Template
3. Use ` javac ` commands to compile the source file, compiled into one. The bytecode file at the end of the class for the
? Javac HelloWorld. Java
4. Use ` Java ` command to explain bytecode file execution
? Java HelloWorld
Note: if you modify the source code, the need to recompile the bytecode file
# # configure the environment variables:
Objective: * * * * any path of Java
CodePudding user response:
Consider the