Complete exercise 14.7. // Exercise 14.7 : PigLatin.java // Application translat

Question

Complete exercise 14.7.

// Exercise 14.7 : PigLatin.java

// Application translates English to Pig Latin.

import javax.swing.JFrame;
public class PigLatin{

public static void main(String[] args) {

// create PigLatinFrame object

//set default close operation

//set frame size(400, 200)

//display frame

}

} // end class PigLatin

//Exercise 14.7: PigLatinFrame.java

// Application translates English to Pig Latin.

import java.awt.FlowLayout;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import java.util.Scanner;

import javax.swing.JFrame;

import javax.swing.JScrollPane;

import javax.swing.JTextArea;

import javax.swing.JTextField;

public class PigLatinFrame extends JFrame{

// create JTextField for entering sentences to be converted

// create JTextArea to log converted pig Latin phrases

public PigLatinFrame() {

super("Pig Latin Conversion");

// create input text field

// add event handler

// anonymous inner class

{

public void actionPerformed(ActionEvent e) {

//get input text and convert the phrase  

//clear input text

}  

}

//close event handler

// create output text area

// do not allow output text area to be editable
// set layout

//add input component

//add scroll pane component to allow scrolling   

}
// convert a phrase to pig Latin and display it

private void convertPhrase(String phrase) {

// translate user input   
// print words converted to pig Latin one at a time

for (String word : words)

// print latin word
// add newline to output

}
// convert a single word to pig Latin and add to output text area

private void printLatinWord(String word) {

output.append(word.substring(1));

// append first character of output to lower case

output.append("ay ");

}

} // end class PigLatin

Explanation / Answer

// Exercise 14.7 : PigLatin.java
// Application translates English to Pig Latin.
import javax.swing.JFrame;
public class PigLatin{   
public static void main(String[] args) {   
// create PigLatinFrame object
PigLatinFrame pig=new PigLatinFrame();
   pig.setSize(400, 200);
pig.setLocation(100,100);
pig.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
pig.setVisible(true);
}
} // end class PigLatin

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;

public class PigLatinFrame extends JFrame implements ActionListener {

// Data members: components of the GUI.
private JLabel englishLabel;
private JTextArea englishText;
private JButton translate;
private JLabel latinLabel;
private JTextArea latinText;

/**
* Constructor: sets up the GUI.
*/
public PigLatinFrame() {

   // Set some basic frame properties
   this.setTitle("Pig Latin Translator");

   // Get the content panel from inside the frame
   Container panel = this.getContentPane();

   // Not using a layout- doing absolute positioning
   panel.setLayout(null);

   // Construct the labels for english and latin text
   englishLabel = new JLabel("English: ");
   latinLabel = new JLabel("Pig Latin: ");
  
   // Construct the area for text entry, with border and text wrap
   englishText = new JTextArea();
   englishText.setEditable(true);
   englishText.setBorder(BorderFactory.createLoweredBevelBorder());
   englishText.setLineWrap(true);
JScrollPane englishTextScrollPane = new JScrollPane (englishText,JScrollPane.VERTICAL_SCROLLBAR_ALWAYS, JScrollPane.HORIZONTAL_SCROLLBAR_ALWAYS);
  
   // Construct the area for text display, with border and text wrap
   latinText = new JTextArea();
   latinText.setEditable(false);
   latinText.setBorder(BorderFactory.createRaisedBevelBorder());
   latinText.setLineWrap(true);
JScrollPane latinTextScrollPane = new JScrollPane (latinText,JScrollPane.VERTICAL_SCROLLBAR_ALWAYS, JScrollPane.HORIZONTAL_SCROLLBAR_ALWAYS);
  
   // Construct the button for translation
   translate = new JButton("Translate");
   translate.addActionListener(this);
  
    // Add all the components to the panel
   panel.add(englishLabel);
   panel.add(englishTextScrollPane);
   panel.add(translate);
   panel.add(latinLabel);
   panel.add(latinTextScrollPane);
  
// Set the locations of the components inside the panel
   englishLabel.setBounds(25,100,400,25);
   englishTextScrollPane.setBounds(50,130,400,100);
   translate.setBounds(200,260,100,40);
   latinLabel.setBounds(25,320,100,25);
   latinTextScrollPane.setBounds(50,350,400,100);

}

/**
* Returns the string in Pig Latin.
* @param text The text to translate
* @return The translated version
*/
private String toPigLatin(String text) {

   String translation = "";

   // Go until there aren't any more words
   while (!text.equals("")) {

   // Get the first word
   int wordEndIndex = findWordEnd(text);
   String word = text.substring(0, wordEndIndex);

   // Find the root and tail in pig latin
   int vowelIndex = findVowel(word);
   String root = word.substring(vowelIndex);
   String tail = "-" + word.substring(0, vowelIndex) + "ay";

   // Print the translated word
   translation = translation + root + tail + " ";

   // Cut first word off text (and spaces)
   text = text.substring(wordEndIndex).trim();
  
   }

   return translation;
}

  
/**
* Finds the end of the first word in the string.
* @param text The text to look in
* @return The index of the first space
*/
private int findWordEnd(String text) {
  
   int indexOfSpace = text.indexOf(" ");
     
   if (indexOfSpace == -1) // Happens if there is no space
   return text.length();
   else
   return indexOfSpace;
}

  
/**
* Finds the first vowel in the word.
* @param word The word to look in
* @return The index of the first vowel
*/
private int findVowel(String word) {

   // Look for a vowel, or the end of the word
   for (int i=0; i<word.length(); i++) {
   if (word.charAt(i) == 'a' ||
       word.charAt(i) == 'e' ||
       word.charAt(i) == 'i' ||
       word.charAt(i) == 'o' ||
       word.charAt(i) == 'u' ) {

       return i;
   }
   }

   // Gets here if there aren't any vowels
   return word.length();
}

/**
* Calls the translation method when there's a button click.
* @param event The ActionEvent caused by a button click
*/
public void actionPerformed(ActionEvent event) {

   if (event.getSource() == translate) {

   // Get the English they entered
   String text = englishText.getText();
   text = text.trim();
   text = text.toLowerCase();

   // Display the translation
   latinText.setText(toPigLatin(text));
   }
}

}

Please Create Separate files for both PigLatin.java and PigLatinFrame.java and compile them separately.

Then run the PigLatin file.

Also you can manipulate the orientation of the components in the frame by varying the following code:

// Set the locations of the components inside the panel
   englishLabel.setBounds(25,100,400,25);
   englishTextScrollPane.setBounds(50,130,400,100);
   translate.setBounds(200,260,100,40);
   latinLabel.setBounds(25,320,100,25);
   latinTextScrollPane.setBounds(50,350,400,100);

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