event action in applet not working

[Jorge Vazquez]

Hi everyone!...
I got this applet, that converts from decimal to binary to hex and vice versa, but the even listeners are not doing anything... when I enter a number and press enter. nothing happens. Also, the applet crashes when trying to close it. Any help appreciated

import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JApplet;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextField;
private int decimalNumber = 0;
private int hexNumber = 0;
private int binaryNumber = 0;
/**
 * number conversion...
 * @author jorge
 */
public class NumberConverter extends JApplet implements ActionListener {
    private JTextField jTextDec;
    private JTextField jTextBin;
    private JTextField jTextHex;
    private JLabel jLabelDec;
    private JLabel jLabelBin;
    private JLabel jLabelHex;
   

    @Override
    public void init() {
        JPanel panel1 = new JPanel(new GridLayout(3, 1));
        panel1.add(new JLabel("Decimal"));
        panel1.add(new JLabel("Binary"));
        panel1.add(new JLabel("Hexadecimal"));
        
        JPanel panel2 = new JPanel(new GridLayout(3, 1));
        jTextDec = new JTextField();
        jTextBin = new JTextField();
        jTextHex = new JTextField();
        panel2.add(jTextDec);
        panel2.add(jTextBin);
        panel2.add(jTextHex);  
        
        this.jTextDec.setHorizontalAlignment(JTextField.CENTER);
        this.jTextHex.setHorizontalAlignment(JTextField.CENTER);
        this.jTextBin.setHorizontalAlignment(JTextField.CENTER);
        
        add(panel1, "West");
        add(panel2, "Center");
        
        this.jTextBin.addActionListener(this);
        this.jTextDec.addActionListener(this);
        this.jTextHex.addActionListener(this);
        
    }
    
    @Override
    public void actionPerformed(ActionEvent e) {
        if(e.getSource() == this.jTextDec) {
            //perform bin and hex conversion
            String decimal = this.jTextDec.getText();            
            String binary = convertDecToBin(decimal);
            String hexadecimal = convertDecToHex(decimal);
            //posting number to gui
            this.jTextBin.setText(binary);
            this.jTextHex.setText(hexadecimal);
        }
        else if(e.getSource() == this.jTextBin) {
            //perform decimal and hex conversion
            String binary = this.jTextBin.getText();
            String hexadecimal = convertBinToHex(binary);
            String decimal = convertBinToDec(binary);
            
            this.jTextHex.setText(hexadecimal);
            this.jTextDec.setText(decimal);
        }
        else if(e.getSource() == this.jTextHex) {
            //perform decimal and binary conversion
            String hexadecimal = this.jTextHex.getText();
            String decimal = convertHexToDec(hexadecimal);
            String binary = convertDecToBin(decimal);
            
            this.jTextBin.setText(binary);
            this.jTextDec.setText(decimal);
        }
    }
    
    //converting from decimal to binary
    public String convertDecToBin(String number) {
        int decNumber = Integer.parseInt(number);
        String binary = "";
        while(decNumber > 0) {
            binary = (decNumber % 2) + binary;            
            decimalNumber /= 2;
        }
        return binary;        
    }
    
    //convert dec to hex
    public static String convertDecToHex(String s) {
        int value = Integer.parseInt(s);
        String hex = "";
        while (value != 0) {
            int number = value % 16;
            hex = convertToHex(number) + hex;
            value /= 16;
        }
        return hex;
    }
    
    public static char convertToHex(int number) {
        if (number == 10) {
            return 'A';
        }
        if (number == 11) {
            return 'B';
        }
        if (number == 12) {
            return 'C';
        }
        if (number == 13) {
            return 'D';
        }
        if (number == 14) {
            return 'E';
        }
        if (number == 15) {
            return 'F';
        }
        return (char) (number + 48);
    }
    
    //converting from binary to decimal
    public String convertBinToDec(String binNumber) {
        int decimal = Integer.parseInt(binNumber, 2);
        return String.valueOf(decimal);       
    }
    
    //convert from binary to hex
    public String convertBinToHex(String binNumber) {
        int value = binNumber.charAt(0) - '0';
        for (int i = 1; i < binNumber.length(); i++) {
            value = value * 2 + binNumber.charAt(i) - 48;
        }
        return String.valueOf(value);
    }
    
    //convert hex to decimal
    public static String convertHexToDec(String hexString) {
        int value = convertHexToDec(hexString.charAt(0));
        for (int i = 1; i < hexString.length(); i++) {
            value = value * 16 + hexString.charAt(i) - 48;
        }

        return String.valueOf(value);
    }
    
    static int convertHexToDec(char ch) {
        if (ch == 'A') {
            return 10;
        }
        if (ch == 'B') {
            return 11;
        }
        if (ch == 'C') {
            return 12;
        }
        if (ch == 'D') {
            return 13;
        }
        if (ch == 'E') {
            return 14;
        }
        if (ch == 'F') {
            return 15;
        }
        return ch - '0';
    }   
    
    public static void main(String... args) {
        JFrame frame = new JFrame();
        NumberConverter applet = new NumberConverter();
        
        frame.add(applet, "Center");
        
        applet.init();
        applet.start();
        
        frame.setSize(300, 150);
        frame.setTitle("Number Converter");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setLocationRelativeTo(null);
        frame.setVisible(true);
    }
}

[Darryl Burke]

Hello Jorge, and welcome to the Ranch! Which listener did you expect to respond to the <Enter> key?

Also, the applet crashes when trying to close it.

An Applet is meant to be displayed in a browser. What exactly do you mean by 'closing' an Applet?

[Jorge Vazquez]

Darryl Burke wrote:Hello Jorge, and welcome to the Ranch! Which listener did you expect to respond to the <Enter> key?

this method:

public void actionPerformed(ActionEvent e)

An Applet is meant to be displayed in a browser. What exactly do you mean by 'closing' an Applet?

yeah, but I can also run it in netbeans...

[Darryl Burke]

So now, the first thing you should do is put a System.out.println("in actionPerformed") at the top of the actionPerformed(...) method to confirm that the method is entered. Do that and report the result here.

[Jorge Vazquez]

Darryl Burke wrote:So now, the first thing you should do is put a System.out.println("in actionPerformed") at the top of the actionPerformed(...) method to confirm that the method is entered. Do that and report the result here.

yeah, I found the problems... one: I declare three variables outside of the class (After I changed my code I forgot to remove them). Second: on line 90 instead of using decNumber I'm using decimalNumber, so I corrected that and seem to work now. Thanks.

[Darryl Burke]

I'm happy you solved your problem yourself, fut I'm flummoxed how you could do this, as Java doesn't allow anything of the sort:

Jorge Vazquez wrote:I declare three variables outside of the class.