A second GUI - An Introduction to Graphical User Interfaces with Java Swing - page 37

A second GUI

4

In this chapter we construct another graphical interface. The purpose of this one is
to pass text to a running application.

4.1

■

The specification of the application

The application is to perform an extremely simple text analysis. The appearance
and functionality of the GUI should look like Figure 4.1. To the right of the text
'Enter text:' is an editable area where the user can enter or change text. If one
clicks on the button 'Analyse' then a small analysis of the text is performed and
the result is displayed in the following way. The text is converted to capital letters
and copied into the area to the right of 'Current text:'. The number of occurrences
of the letter 'E' in upper or lower case is displayed to the right of 'No. of Es in
current text:'. At the same time the content of the user editable area is erased.

Frame

Title

Dannebrog

Enter text: Editable

text area

Repetition of
text in upper
case

Current text: DANNEBROG

No of Es in current text: 1

Number of
E in text

Analyse

Button

Fixed texts

Figure 4.1 The specification of the GUI for text analysis