How to detect if a graphical interface is supported?

Question

I need my Java program to have two display modes: a GUI interface and a command line interface. If I run it in Windows, OS X, or another graphical environment I should get

Answer 1

I was looking for te same solution and came up with simply use an argument so when i run my program from comandline the args differs in length

if(args.length > 0) {
    System.out.println("command line mode");
}