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[Java] Computers and Java 본문

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[Java] Computers and Java

YEJI ⍢ 2022. 10. 17. 16:48
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COMPUTER and JAVA

 

① Computer system → hardware + software

✓ Processor (CPU) - Central Processing Unit

✓ Memory - main & auxiliary

✓ Input devices - mouse, keyboard etc.

✓ Output devices - video display, printer etc.

 

Memory (Main & Auxiliary)

↕

Input devices → processor(CPU) → Output devices

 

 

 

② Hardware → the physical components(machine)

✓ Keyboard

✓ Monitor

✓ Chassis - CPU memory, disk drives, I/O connectors

 

Main Memory

- Working area

- Temporarily stores program and data

- While program is executing

 

Auxiliary memory

- Permanent(more or less) Memory

- Secondary memory

- Saves program and results

- Includes floppy&hard disk

 

Cache Memory

- Advantage: locality

- Disadvantage: bottleneck

 

 

 

③ Program

 A set of instructions for computer

 

 

 

④ Software

All the different kinds of programs

 

 

⑤ Various Types of User Interfaces

✓ Command-line - type in key words and letters

✓ Menu - parts of DOS and Windows

✓ GUI (Graphical User Interface) - "Event-driven"

 

 

 

 

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