Not able to add components to JApplet

Question

I'm trying to understand how JApplet work. I've worked with JFrame before and I've got it working but I'm trying to create the same porgrams but in JApplet without any success.

I Know there is something wrong with this code but I don't know what:

import java.awt.Color;
import java.awt.FlowLayout;
import java.awt.Font;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

//Importerar swing biblioteket då det behövs för att skapa användargränssnitt.
import javax.swing.*;

public class BrevApplet extends JApplet {
private static final long serialVersionUID = 1L;

public void init(){
    JButton performCalculation = new JButton("Beräkna");
    JTextField textField = new JTextField(15);
    JTextArea textArea = new JTextArea(200, 200);
    textArea.setText("dfgdgdgdfdgdfg");

    performCalculation.addActionListener(new ActionListener(){

        public void actionPerformed(ActionEvent e){
            int kostnad = 0; // Initialiserar en variabel vars värde kommer att ändra beroende på brevets vikt.
            int gram = Integer.parseInt(textField.getText());
            String message;
            //If selektion som kollar värdet som användaren angav och ger variabel kostnad rätt värde.
            //om antal gram överskrider 2000 så anger man en sträng som informerar användaren om att
            //brevet räknas som paket. Därefter så skapar men en dialogruta som skriver ut priset.
            if(gram < 2001){
                if(gram < 21){
                    kostnad = 6;
                } else if(gram > 20 && gram < 101){
                    kostnad = 12;
                } else if(gram > 100 && gram < 251){
                    kostnad = 24;
                } else if(gram > 250 && gram < 501){
                    kostnad = 36;
                } else if(gram > 500 && gram < 1001){
                    kostnad = 48;
                } else if(gram > 1000 && gram < 2001){
                    kostnad = 72;
                }
                message = "Pris: " + kostnad;
            } else {
                message = "Brev över 2000g räknas som paket.";
            }
            textArea.setText(message);
        }

    });

    JPanel panel1 = new JPanel(new FlowLayout());
    panel1.add(textField);
    panel1.add(performCalculation);
    panel1.add(textArea);
    panel1.setOpaque(true);
    panel1.setBackground(Color.green);
    panel1.setForeground(Color.blue);
    panel1.setFont(new Font("Verdana", Font.BOLD, 20));
    add(panel1);
}
}

This produces this result:

What I'm trying to achieve is that you enter amount gram a letter wiegh and the cost will be calculated and displayed in a JTextArea. But the JTextArea is not even showing.

Answer 1

Change:

JTextArea textArea = new JTextArea(200, 200); 

To:

JTextArea textArea = new JTextArea(5, 5); 

..and see if it works for you. Those integers in the constructor refer to columns & rows, not pixels!