1. Run Java file with Window cmd
Create a source code file (.java)
Save & Remind the saved directory
Open ‘cmd ‘ and change directory to where java file is located
Check java jdk is installed in your computer. ($ java –version)
Compile and run java file (javac HelloWorld.java  java HelloWorld)

2. Run Java file with Linux terminal
Create a source code file (using vi editor) ($ vi HelloWorld.java)

3. Run Java file with Linux terminal
<How to use vi editor>

4. In Command mode (escape)
 i : insert mode (can insert letter)
 x : erase one letter
 :wq! : save file and exit editor

5. Ex)
Press ‘Esc’ key  Press ‘i’ to insert letters
Press ‘Esc’ key  Press ‘x’ to erase a letter
Press ‘Esc’ key  Press ‘h, j, k, l’ to move cursor
Press ‘Esc’ key  Press ‘:wq!’ to save and exit editor

6. Run Java file with Linux terminal
2. Write a source code file (using vi editor)
3. Check .java file

7. Run Java file with Linux terminal
4. Check Java version
5. Compile and Run ‘HelloWorld.java’

8. <Window cmd command>
cd: change directory
dir: Display a list of files and folders
<Linux terminal command>
ls: Display a list of files and folders