java--Learn the things Java should know--dark horse programmer

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Computer Fundamentals1 Computer Overview

The computer (computer) is what we call a computer. The official explanation is a modern, intelligent electronic device that can operate in accordance with the program, automating and processing massive amounts of data at high speed. A computer consisting of hardware and software that does not have any software installed is called bare metal. Common forms are desktop computers, laptops, mainframe computers, and so on.

The application of computer has penetrated into all fields of society and is changing the way people work, study and live, and promote the development of society.

2 Overview of computer hardware and software

Computer hardware (computer Hardware) refers to a computer system consisting of electronic, mechanical and optoelectronic components, such as a variety of physical devices collectively. These physical devices constitute an organic whole to provide the material basis for the computer software operation according to the requirements of the system structure.

The computer usually consists of CPU, motherboard, memory, power supply, Host box, hard disk, video card, keyboard, mouse, monitor and other components.

Computer software is an essential thing in the process of using computer, computer software can make the computer in order to complete the specific function in advance, computer software according to its function divided into system software and application software

System software: DOS (Disk Operating system), Windows, Linux, Unix, Mac, Android, IOS

Application software: Office QQ chat YY language minesweeper

3 software development and computer language overview

Software

A collection of computer data and instructions organized in a specific order

Development

The process of making software

Software development

Build software with development tools and computer language

Language

Human communication of all kinds of expression symbols, facilitate communication between people and exchange of information

Computer language

A special language for communicating information between people and computers

There are characters, symbols and so on in the computer language.

Common computer languages such as C,c++,c#,java

4 Man-Machine interaction

Graphical interface: This method is simple and intuitive, the user is easy to accept, easy to operate.

Command-line mode: You need to have a console, enter specific instructions, and let the computer do some work. More trouble, need to record some commands.

5 keyboard function keys and shortcut keys

tab Jump Bar, ALT + TAB combination shortcut key, can be implemented in the current multiple window switching

Shift Ctrl Alt

Spaces Enter the space bar is needless to say, is to output a space; Enter is the ENTER key, click OK

Window win key, open the Start menu, can also be used with a number of key combinations, quickly use a function

It's up and down.

PrtSc (printscreen) screen

CTRL + A Select all

CTRL + C copy

Ctrl + V Paste

Ctrl+x Cut

CTRL + Z Undo

Ctrl+s Save

6 DOS command explanation

How to open the DOS console

Common DOS commands

D: Enter drive letter Toggle

Dir (directory): Lists the files and folders in the current directory

MD (Make directory): Create directory

RD (remove directory): Delete directory

CD (change directory) changes the specified directory (enter the specified directory)

CD: Back to top level directory

Cd\: Go back to the root directory

Del (delete): Delete files, delete a bunch of suffix names like files *.txt

Exit: Exit DOS command line

CLS: (Clear screen) clear

This is some basic knowledge about computers, and the next one begins to formally enter Java.

java--Learn the things Java should know--dark horse programmer