Learn how to use the Command pattern to encapsulate requests as objects that you can execute alone or in sequence in your Java programs.

But these aforementioned Java command-line tools -- namely, javac, javap, jstat, jdeps and jar -- are the five that serious software developers need to know.

You can make any unix command into an icon for the GUI by just typing whatever you'd normally type into a textfile, and saving it as 'textfile.command'. 'command' is the filetype for Terminal, so ...

Step 5: Run the Java preview feature code With the code compiled, you can execute it by adding the --enable-preview switch to the java command: jdk13@preview:$ java --enable-preview ...