A second GUI - An Introduction to Graphical User Interfaces with Java Swing - page 43

54.

this .add(numberTextLabel);

55.

this .add(numberOfEsLabel);

56.

}

57.
58. public void startAnalysisAndDisplayResult()

59.

{

60.

String text = inputField.getText();

61.

analysisModel.analyse(text);

62.

lastTextLabel.setText(analysisModel.getCurrentText());

63.

int noOfEs = analysisModel.getCurrentNumberOfEs();

64.

numberOfEsLabel.setText(Integer.toString(noOfEs));

65.

inputField.setText("");

66.

}

67.
68.

}

■ 4.4 The control part

Class TextAnalysisListener implements the interface ActionListener .It
is required to implement method actionPerformed . Here actionPerformed
calls the method startAnalysisAndDisplayResult of TextAnalysisPanel .To
this end the TextAnalysisListener has to know the TextAnalysisPanel . This
is achieved by passing (a reference) to TextAnalysisPanel in the constructor of
TextAnalysisListener .

public TextAnalysisListener(TextAnalysisPanel taPanel)

Class TextAnalysisFrame generates an instance of TextAnalysisListener and
assigns it to the button labelled 'Analyse'.

TextAnalysisListener taList = new TextAnalysisListener(taPanel);
analyseButton.addActionListener(taList);

Below are the listings of the class TextAnalysisListener.java and the driver
class testanalysisTest.java . Figure 4.3 shows the result.

Figure 4.3 The appearance of the text analysis GUI