input og output FIELD

Kan du forklare lidt nærmere ?

fandt på noget men kan ikke rigtig få lo... til at virke..

Kode:

/*
*
*
*/

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


public class Calculator extends JFrame implements ActionListener {

    //Datafields
    private JButton[] digitButtons;
    private JTextField result = new JTextField(10);

    //Methods
    //postconditions : Displays 5 x 4 grid of buttons in the Frame
    pulbic void init() {
        String[] buttonLabels = {"7","8","9","*","/","4","5","6","-","+/-",
                                  "1","2","3","+","","0",".","="};

    //Create an Array of buttons
    digitButtons = new JButton(buttonLabels.length);

    //Create a 5x4 grid for placement of buttons.
    JPanel buttonGrid = new JPanel();
    buttonGrid.setLayout(new GridLayout(5, 4));

    //Create a button with each buttonlabel, add it to buttonGrid,
    //and register the frame as a listener
    for (int nextBut = 0; nextBut < digitButtons.length; nextBut++) {
        digitButtons[nextBut] = new JButton(buttonLabels[nextBut]);
        digitButtons[nextBut].addActionListener(this);
        buttonGrid.add(digitButtons[nextBut]);
    }

    JLabel instruct = new JLabel("Pres a button");
    getContentPane().add(instruct, BorderLayout.NORTH);
    getContentPane().add(buttonGrid, BorderLayout.CENTER);
    getContentPane().add(result, BorderLayout.SOUTH);
}

//Displays the label of the button pressed
public void actionPerformed(ActionEvent aE){
    Object whichButton = aE.getSource();
    for (int nextBut = 0; nextBut < digitButtons; nextBut++){
        if (whichButton == digitButtons[nextBut])
        result.setText("you pressed " + digitButtond[nextBut].getText());
    }
}

Efter jeg har lavet mit layout går jeg igang med at tilføje actions til den enkelte knap

kan du ikke bare gøre noget i den her stil

int input = Integer.parseInt(display.getText())
og så gøre det du skal
gemme det i en anden variabel(output) og så

display.setText(output);

..