Introducing the IDEA editor - IntelliJ IDEA in Action - page 42

public class CommandLineClient {
public static void main(String[] args) {
if (args.length != 2) {
System.out.println("Requested parameters: " +
"<source currency code> <target currency code>");
}
else {
CurrencyExchangeService service =
CurrencyExchangeServiceFactory.getService();
double rate =
service.requestCurrentRate(args[0], args[1]);
System.out.println("Rate is " + rate);
}
}
}

Request currency
exchange service
Determine
exchange rate

Print calculated rate

Note that this command-line client won't work yet. You know the interface
details, and you can easily create a client that uses that interface, but you still
need an implementation of that interface to be provided by the factory. Save
your work, and we'll discuss some of IDEA 's features that can help you write
that implementation.

2.2.2 Opening files into the editor

As discussed in chapter 1, the Project window gives you access to all the files in
your project. You can double-click any recognized file (other than binary files, of
course) to open it in the editor; alternatively, select the file and press F4 . You can
also load files into the editor through most of the other places where Java classes
are referenced: for example, there are direct class references in result windows
like compilation error messages, search usages windows, and so forth. When you
see a class referenced somewhere, such as in a Find result tool window like that
shown in figure 2.10, right-click and select the Jump to Source option from the
context menu (or, again, press F4 ).

Figure 2.10
This Find tool window is
the result of searching the
project for usages of the
word Currency . You can
click the results to jump
directly to the underlying
source by loading it into
the IDEA editor.