Sting 2021-01-05 16:57:32
01-big-javase big javase

windows Common commands

1.cmd window

1. Shortcut key : win+r
2. Start menu entry cmd
3. Folder path input cmd ( Can be directly assigned to the current path )

2. Common commands

1. View the current computer's ip Address
2.cd command ( A little bit in the middle is OK )
cd. Represents the current directory
cd.. Represents to go back to the previous directory
cd..\.. Go back to the previous Directory
Toggle character :
Toggle directory :
tree Tree structure
4.dir Lists all subset directories in the current folder
5. New folder
mkdir Folder name
6. Delete folder ( You can't delete files )
rmdir Folder name
7. Delete file ( You can't delete a folder )
del file name
del * --- Delete all files in this folder
del *.txt --- Delete with txt Final document ( The file suffix can be changed )
8. Clear the screen
9. Help instruction
help cd

java summary

 James · Gauss Lin (James Gosling)
2. The development history
1990 year sun company , Smart home
be based on C++ Made an expansion , Developed a new language
Oak( Rubber tree )
sun The company set up a new company FirstPerson, To sell Oak Language
Three bids were held But unfortunately, they all miscarried
Dissolution of a subsidiary ,Oak Language has also been shelved
The Internet is coming , Need a lightweight language to capture dynamic web pages
But then Oak This trademark has been registered therefore Java It's coming out.
1995,sun The company officially withdrew Java High-level language ,2009 year sun By oracle Company purchase
3. The main application fields are
1. Android
2. big data
3. The embedded
4. Website program ( TaoBao , JD.COM )
4. Characteristics of language
1. Easy to learn ( be relative to C,C++)
2. Security : Security mechanism
3. Face object : Programming idea
4. Open source ( Open source --- free , Strong vitality )
5. Cross platform
Explain cross platform :
Java The operation of the program depends on jvm virtual machine , We just need to install the corresponding version of... On different platforms jvm You can achieve , A compilation , The result of running around

Java Installation of environment , To configure

1.Java Basic concepts of (jvm jre jdk)
jvm:Java virtual machine --- The core of cross platform
jre: Runtime environment ---jre=jvm+ The core library
jdk:java Development kit ---jdk=jre+ development tool
2.jdk Download and configure
download :
[jdk Download address ](https://www.oracle.com/java/technologies/javase/javase-jdk8-downloads.html)
ps: It's best not to change its installation location
To configure :
1. newly build JAVA_HOME
Input jdk Installation path for
2.path Enter... In the variable
3.java Program operation
javac file name .java
java file name

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