Zero-basic learning java (1): Basic knowledge and basic knowledge of java

Zero-basic learning java (1): Basic knowledge and basic knowledge of java
 

1. Software Development

Software is a collection of computer data and commands organized in a specific order. System software and application software.

System software: system software is responsible for managing various independent hardware in computer systems so that they can coordinate their work. System software allows computer users and other software to treat computers as a whole without considering how each underlying hardware works. For example, windows, linux, and mac systems

Application Software: application software is developed for a specific purpose. It can be a specific program, such as an image browser. It can also be a set of programs that are closely linked with each other and can collaborate with each other, such as Microsoft Office software.

Linux: Server Security and Stability centos Ubuntu Red Hat

Window: The Blue Screen System is insecure and easy to operate.
2. Human-Computer Interaction
Graphical interface GUI (GraphicalUserInterface GUI) is simple, intuitive, easy to use, and easy to use.
Command line interface (CommandLineInterface CLI): You need a console to enter specific commands for the computer to complete some operations. This is troublesome. You need to record some commands.
3. Common doscommands
Dir: list files and folders in the current directory
Md: create a directory
Rd: delete a directory
Cd: Enter the specified directory
Cd ..: Return to the upper-level directory
Cd \: Return to the root directory
Del: delete an object
Exit: exit dos command line
D: Enter disk d
Echo>: create a file.
3.1 case operations:
Enter drive C:
View the directory of drive C: dir
Create a 21061216-day Folder: md21061216
Create the first group: md team1
Create the Second group: md team2
Enter the first group: cd team1
Withdraw from the first group: cd ..
Write the echo "IT "> 1.txt/. doc in 1.txt of the first it group.
Delete the second group of folders: del team2
Delete file: del
3.2. Quickly open the software
Calc open Calculator
Mspaint open the canvas
Ipconfig
Ping the ip address to check whether the computer can be pinged
4. What is computer language?
Language: communication between people. For example, Chinese people communicate with Chinese people in Mandarin. Chinese people must learn English if they want to communicate with the British.
Computer Language: communication between people and computers.
If people want to communicate with computers, they need to learn computer languages.
There are many computer languages, such as C, C ++, Java, and PHP.

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