java

Setup (only follow these directions if you need/want the folder structure)

In your terminal, copy paste the code below to clone this repository and turn off git so that it's simply a copy of the folder structure in your IDE. You will NOT be able to push.

git clone git@github.com:hstatsep/apcsa.git
cd apcsa
rm -rf .git
echo "Done"

Template

• Open Template.java
• Do NOT edit the file. Just look at it!

Note: your filename MUST match the class name. Naming convention: FirstLetterOfEveryWordCapitalized.java

Hello World

cd u00-other
mkdir HelloWorld
cd HelloWorld
touch Hello.java

• Open Hello.java and paste in the same code from your template (but update the class name to Hello). Then run the following commands:

• javac Hello.java

• java Hello

• You should see Hello World in your terminal

• As a general rule of thumb, use this same format when making new programs (cd into the correct directory, make a folder with the appropriate name, cd into it, then name your file WhateverYouWant.java which will then get compiled to WhateverYouWant.class). We make an entire folder because sometimes we will have multiple Java files that relate to each other, so this helps keep them organized.

  • As a shortcut, you can copy with the cp source destination command. I.e. once you make your HelloWorld directory and cd into it, you could do cp /workspaces/apcsa/Template.java ./WhateverYouWant.java

jcar: Java compile and run

Setting this up allows you to compile and run in the same command

• Copy/paste the following into the terminal.

echo "" >> ~/.bash_profile
echo "jcar() { javac \$1.java && java \$1 ; }" >> ~/.bash_profile
echo "" >> ~/.bash_profile
echo "Done"

To see the command take effect, you must reload your IDE.

To use, type jcar Program (using your own Java program file, but with no .java)

• Try this out by adding ! to your Hello World program so that it outputs Hello World!
• Run the shortcut by doing jcar Hello

Git alias commands

• Copy/paste the following into the terminal.

echo "" >> ~/.bash_profile
echo "alias gp=\"git add ." >> ~/.bash_profile
echo "git commit -m 'update repo'" >> ~/.bash_profile
echo "git push\"" >> ~/.bash_profile
echo "Done"

• If you still see the last command in your terminal, press ENTER
• Close the terminal and open a new one
• In the future, you can simply type gp to automatically add/commit/push all updated files in a repo
• You can continue to use git add filename if you would like to be more selective, and/or git commit -m "message" if you would like to be more specific