температуры GUI Проблема преобразования

Question

/* 
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* and open the template in the editor. 
*/ 
package temperature.conversion; 
import java.awt.event.ActionListener; 
import java.awt.event.ActionEvent; 
import java.awt.FlowLayout; 
import javax.swing.JRadioButton; 
import javax.swing.JButton; 
import javax.swing.ButtonGroup; 
import javax.swing.JTextField; 
import javax.swing.JFrame; 

import java.text.DecimalFormat; 

/** 
* 
* @author Charles 
*/ 
public class TemperatureConversion extends JFrame { 

    private JTextField inputField; 
    private JTextField outputField; 
    private JRadioButton celstofahr; 
    private JRadioButton fahrtocels; 
    private JRadioButton celstokelv; 
    private JRadioButton kelvtocels; 
    private JRadioButton fahrtokelv; 
    private JRadioButton kelvtofahr; 
    private JButton converter; 
    private ButtonGroup tempGroup; 

    public TemperatureConversion() { 
     super("Temperature Conversion Table"); 
     setLayout(new FlowLayout()); 

     celstofahr = new JRadioButton("Celsius to Fahrenheit", true); 
     fahrtocels = new JRadioButton("Fahrenheit to Celsius", false); 
     celstokelv = new JRadioButton("Celsius to Kelvin", false); 
     kelvtocels = new JRadioButton("Kelvin to Celsius", false); 
     fahrtokelv = new JRadioButton("Fahrenheit to Kelvin", false); 
     kelvtofahr = new JRadioButton("Kelvin to Fahrenheit", false); 

     add(celstofahr); 
     add(fahrtocels); 
     add(celstokelv); 
     add(kelvtocels); 
     add(fahrtokelv); 
     add(kelvtofahr); 

     tempGroup = new ButtonGroup(); 
     tempGroup.add(celstofahr); 
     tempGroup.add(fahrtocels); 
     tempGroup.add(celstokelv); 
     tempGroup.add(kelvtocels); 
     tempGroup.add(fahrtokelv); 
     tempGroup.add(kelvtofahr); 

     inputField = new JTextField(" ", 4); 
     inputField.addActionListener((ActionListener) this); 
     converter = new JButton("Convert"); 
     converter.addActionListener(
     new ActionListener() 
     { 
    public void actionPerformed(ActionEvent event) 
    { 
     Object source = event.getSource(); 

     if(source == inputField) { 
     double init_temp = 0.000; 
     double final_temp = 0.00; 
      DecimalFormat three = new DecimalFormat("0.000"); 

    String string_temp = inputField.getText(); 
    init_temp = Double.parseDouble(string_temp); 

    if(celstofahr == source){ 
     final_temp = ((5/9) * init_temp) - 32;  
     outputField.setText(String.valueOf(final_temp)); 
    } 
    else if(fahrtocels == source){ 
     final_temp = ((1.8) * init_temp) + 32; 
     outputField.setText(String.valueOf(final_temp)); 
    } 
    else if(celstokelv == source){ 
     final_temp = init_temp + 273.16;  
     outputField.setText(String.valueOf(final_temp)); 
    } 
    else if(kelvtocels == source){ 
     final_temp = init_temp - 273.16;  
     outputField.setText(String.valueOf(final_temp)); 
    } 
    else if(fahrtokelv == source){ 
     final_temp = ((5/9) * (init_temp-32)) + 273.16; 
     outputField.setText(String.valueOf(final_temp)); 
    } 
    else if(kelvtofahr != source){ 
    } else { 
      final_temp = ((1.8) * (init_temp+32)) - 273.16; 
      outputField.setText(String.valueOf(final_temp)); 
     } 
    outputField.setText(" " + three.format(final_temp)); 
       } 
      } 
     } 
    ); 
    add(converter); 
    } 
} 

package temperature.conversion; 

import javax.swing.JFrame; 

/** 
* 
* @author Charles 
*/ 
public class MainClass2 { 

    /** 
    * @param args the command line arguments 
    */ 
    public static void main(String[] args) { 
     TemperatureConversion tempconversion = new TemperatureConversion(); 
     tempconversion.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
     tempconversion.setSize(600, 600); 
     tempconversion.setVisible(true); 
    } 
} 

Вот беда:

run: 
Exception in thread "main" java.lang.ClassCastException: temperature.conversion.TemperatureConversion cannot be cast to java.awt.event.ActionListener 
    at temperature.conversion.TemperatureConversion.<init>(TemperatureConversion.java:61) 
    at temperature.conversion.MainClass2.main(MainClass2.java:19) 
Java Result: 1 
BUILD SUCCESSFUL (total time: 3 seconds) 

Answer 1

Вы использовали следующие строки, которые не имеет никакого смысла

inputField.addActionListener((ActionListener) this); 
     //This is the result of ClassCastException 

Но, вы не выполнили ActionListener с JFrame , Вы должны реализовать ActionListener с JFrame и переопределить actionPerformed. Вы можете прослушать конкретный компонент действия с помощью event.getSoruce, чтобы выполнить определенную работу с действием.