Os arquivos abaixo foram extraídos do Livro:

An Introduction to Graphical User Interfaces with Java Swing

package its.TextAnalysisGUI;

/**

* Example program for Introduction to Swing

* @author Paul Fischer, IMM, DTU

* @version 1.0

*/

public class TextAnalysisDriver

{

public static void main(String[] args)

{

TextAnalysisFrame taFrame = new TextAnalysisFrame();

taFrame.showIt("Text analysis");

}

}

package its.TextAnalysisGUI;

import its.SimpleFrame.SimpleFrame;

import java.awt.*;

import javax.swing.JButton;

/**

* Example program for Introduction to Swing

* @author Paul Fischer, IMM, DTU

* @version 1.0

*/

public class TextAnalysisFrame extends SimpleFrame

{

public TextAnalysisFrame()

{

this.setSize(300,150);

TextAnalysisPanel taPanel = new TextAnalysisPanel();

this.getContentPane().add(taPanel,BorderLayout.CENTER);

JButton analyseButton = new JButton("Analyse");

analyseButton.setBackground(Color.blue);

analyseButton.setForeground(Color.yellow);

this.getContentPane().add(analyseButton,BorderLayout.SOUTH);

TextAnalysisListener taList = new TextAnalysisListener(taPanel);

analyseButton.addActionListener(taList);

}

}

package its.TextAnalysisGUI;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

/**

* Example program for Introduction to Swing

* @author Paul Fischer, IMM, DTU

* @version 1.0

*/

public class TextAnalysisListener implements ActionListener

{

private TextAnalysisPanel taPanel;

public TextAnalysisListener(TextAnalysisPanel t)

{

taPanel = t;

}

public void actionPerformed(ActionEvent evt)

{

taPanel.startAnalysisAndDisplayResult();

}

}

package its.TextAnalysisGUI;

/**

* Example program for Introduction to Swing

* @author Paul Fischer, IMM, DTU

* @version 1.0

*/

public class TextAnalysisModel {

private int totalNumberOfEs;

private int currentNumberOfEs;

private int totalNumberOfTexts;

private String currentText;

public TextAnalysisModel() {

totalNumberOfEs = 0;

totalNumberOfTexts = 0;

currentText = "";

}

public void analyse(String str){

currentText = str.toUpperCase();

currentNumberOfEs = 0;

for (int i = 0; i < currentText.length(); i++) {

if(currentText.charAt(i) == 'E'){

currentNumberOfEs++;

}//if

}//for i

totalNumberOfEs += currentNumberOfEs;

totalNumberOfTexts++;

}// analyse

public int getCurrentNumberOfEs(){

return(currentNumberOfEs);

}

public String getCurrentText(){

return(currentText);

}

public int getTotalNumberOfEs(){

return(totalNumberOfEs);

}

public int getTotalNumberOfTexts(){

return(totalNumberOfTexts);

}

}

package its.TextAnalysisGUI;

import java.awt.Color;

import java.awt.GridLayout;

import javax.swing.JLabel;

import javax.swing.JPanel;

import javax.swing.JTextField;

/**

* Example program for Introduction to Swing

* @author Paul Fischer, IMM, DTU

* @version 1.0

*/

public class TextAnalysisPanel extends JPanel

{

private JLabel lastTextLabel;

private JLabel numberOfEsLabel;

private JLabel numberOfTextsLabel;

private JTextField inputField;

private TextAnalysisModel analysisModel;

public TextAnalysisPanel()

{

analysisModel = new TextAnalysisModel();

this.setBackground(Color.yellow);

this.setLayout(new GridLayout(3,2,10,10));

JLabel questionLabel = new JLabel("Enter text:");

JLabel replyLabel = new JLabel("Current text:");

JLabel numberTextLabel = new JLabel("No. of Es in current text:");

lastTextLabel = new JLabel("");

numberOfEsLabel = new JLabel("--");

inputField = new JTextField("");

questionLabel.setOpaque(true);

questionLabel.setBackground(Color.black);

questionLabel.setForeground(Color.white);

replyLabel.setOpaque(true);

replyLabel.setBackground(Color.black);

replyLabel.setForeground(Color.white);

numberTextLabel.setOpaque(true);

numberTextLabel.setBackground(Color.black);

numberTextLabel.setForeground(Color.white);

numberOfEsLabel.setOpaque(true);

numberOfEsLabel.setBackground(Color.red);

numberOfEsLabel.setForeground(Color.white);

lastTextLabel.setOpaque(true);

lastTextLabel.setBackground(Color.red);

lastTextLabel.setForeground(Color.white);

this.add(questionLabel);

this.add(inputField);

this.add(replyLabel);

this.add(lastTextLabel);

this.add(numberTextLabel);

this.add(numberOfEsLabel);

}

public void startAnalysisAndDisplayResult()

{

String text = inputField.getText();

analysisModel.analyse(text);

lastTextLabel.setText(analysisModel.getCurrentText());

int noOfEs = analysisModel.getCurrentNumberOfEs();

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

inputField.setText("");

}

}

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