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2. Modify the Fahrenheit program so that it displays a button that when pressed causes the conversion calculation to take place. The user will have the option of pressing Enter in the text field or pressing the button. Have the listener that is already defined for the text field also listen for the button pu

2. Modify the Fahrenheit program so that it displays a button that when pressed causes the conversion calculation to take place. The user will have the option of pressing Enter in the text field or pressing the button. Have the listener that is already defined for the text field also listen for the button pu

Database System Concepts
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
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2. Modify the Fahrenheit program so that it displays a button that when pressed causes the
conversion calculation to take place. The user will have the option of pressing Enter in
the text field or pressing the button. Have the listener that is already defined for the text
field also listen for the button push.

import java.awt.*; import java. awt.event.*; import javax. swing.*; public class FahrenheitPanel extends JPanel { private JLabel inputlabel, outputlabel, resultLabel; private JTextField fahrenheit; // // Constructor: Sets up the main GUI components. //- public FahrenheitPanel() inputLabel = new JLabel ("Enter Fahrenheit temperature:"); outputLabel = new JLabel ("Temperature in Celsius: "); resultlabel = new JLabel ("---"); fahrenheit = new JTextField (5); fahrenheit.addActionListener (new TempListener()); add (inputlabel); add (fahrenheit); add (outputlabel); add (resultlabel); setPreferredSize (new Dimension(300, 75)); setBackground (Color.yellow); } //*** // Represents an action listener for the temperature input field. /**: private class Templistener implements ActionListener { /- // Performs the conversion when the enter key is pressed in // the text field. /- public void actionPerformed (ActionEvent event) { int fahrenheitTemp, celsiusTemp; String text = fahrenheit. getText (); fahrenheitTemp = Integer.parseInt (text); celsiusTemp = (fahrenheitTemp-32) * 5/9; resultlabel.setText (Integer.toString (celsiusTemp));
Transcribed Image Text:import java.awt.*; import java. awt.event.*; import javax. swing.*; public class FahrenheitPanel extends JPanel { private JLabel inputlabel, outputlabel, resultLabel; private JTextField fahrenheit; // // Constructor: Sets up the main GUI components. //- public FahrenheitPanel() inputLabel = new JLabel ("Enter Fahrenheit temperature:"); outputLabel = new JLabel ("Temperature in Celsius: "); resultlabel = new JLabel ("---"); fahrenheit = new JTextField (5); fahrenheit.addActionListener (new TempListener()); add (inputlabel); add (fahrenheit); add (outputlabel); add (resultlabel); setPreferredSize (new Dimension(300, 75)); setBackground (Color.yellow); } //*** // Represents an action listener for the temperature input field. /**: private class Templistener implements ActionListener { /- // Performs the conversion when the enter key is pressed in // the text field. /- public void actionPerformed (ActionEvent event) { int fahrenheitTemp, celsiusTemp; String text = fahrenheit. getText (); fahrenheitTemp = Integer.parseInt (text); celsiusTemp = (fahrenheitTemp-32) * 5/9; resultlabel.setText (Integer.toString (celsiusTemp));
e e ek k k sk k** *****k // Fahrenheit.java Java Foundations // // Demonstrates the use of text fields. //** k******k ****** * import javax. swing. JFrame; public class Fahrenheit { //- // Creates and displays the temperature converter GUI. //- public static void main (string[] args) { JFrame frame = new JFrame ("Fahrenheit"); frame.setDefaultCloseOperation (JFrame.EXIT_ON_CLOSE); FahrenheitPanel panel = new FahrenheitPanel (); frame.getContentPane().add(panel); frame.pack(); frame.setVisible(true);
Transcribed Image Text:e e ek k k sk k** *****k // Fahrenheit.java Java Foundations // // Demonstrates the use of text fields. //** k******k ****** * import javax. swing. JFrame; public class Fahrenheit { //- // Creates and displays the temperature converter GUI. //- public static void main (string[] args) { JFrame frame = new JFrame ("Fahrenheit"); frame.setDefaultCloseOperation (JFrame.EXIT_ON_CLOSE); FahrenheitPanel panel = new FahrenheitPanel (); frame.getContentPane().add(panel); frame.pack(); frame.setVisible(true);
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