TextField problems

Question

I am currently working on writing a calculator application, but I am having trouble setting up the display bar that displays the numbers the user has pressed at the top of the calculator. I am trying to set the font size of the textfield and changing the alignment, but the text will just not change. I am also trying to make it uneditable, but I am having no luck there either. The source code is:
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class Calculator extends JPanel implements ActionListener
     public Calculator()
          //Turn layout manager off
          setLayout(null);
          //Create components
          JTextField displayBar = new JTextField(18);     
          JButton oneButton = new JButton("1");     
          JButton twoButton = new JButton("2");     
          JButton threeButton = new JButton("3");     
          JButton fourButton = new JButton("4");     
          JButton fiveButton = new JButton("5");     
          JButton sixButton = new JButton("6");     
          JButton sevenButton = new JButton("7");     
          JButton eightButton = new JButton("8");     
          JButton nineButton = new JButton("9");
          JButton zeroButton = new JButton("0");          
          JButton clearButton = new JButton("Clr");
          JButton addButton = new JButton("+");
          JButton multiplyButton = new JButton("X");
          JButton subtractButton = new JButton("-");
          JButton divideButton = new JButton("/");
          JButton equalsButton = new JButton("=");
          JButton signButton = new JButton("-/+");
          JButton squarerootButton = new JButton("v-");
          JButton decimalButton = new JButton(".");     
          //Set button sizes - Initialize all buttons to 50x50
          displayBar.setSize(320, 50);
          oneButton.setSize(50,50);
          twoButton.setSize(50,50);
          threeButton.setSize(50,50);
          fourButton.setSize(50,50);     
          fiveButton.setSize(50,50);
          sixButton.setSize(50,50);
          sevenButton.setSize(50,50);
          eightButton.setSize(50,50);     
          nineButton.setSize(50,50);
          zeroButton.setSize(115,50);          
          clearButton.setSize(50,50);
          addButton.setSize(50,50);
          multiplyButton.setSize(50,50);
          subtractButton.setSize(50,50);
          divideButton.setSize(50,50);
          equalsButton.setSize(50,50);
          signButton.setSize(50,50);
          squarerootButton.setSize(50,50);
          decimalButton.setSize(50,50);                    
          //Set button locations
          displayBar.setLocation(15,15);
          oneButton.setLocation(15,210);
          twoButton.setLocation(80,210);
          threeButton.setLocation(145,210);
          fourButton.setLocation(15,145);     
          fiveButton.setLocation(80,145);
          sixButton.setLocation(145,145);
          sevenButton.setLocation(15,80);
          eightButton.setLocation(80,80);     
          nineButton.setLocation(145,80);
          zeroButton.setLocation(15,275);          
          clearButton.setLocation(275,80);
          addButton.setLocation(210,210);
          multiplyButton.setLocation(210,145);
          subtractButton.setLocation(275,210);
          divideButton.setLocation(275,145);
          equalsButton.setLocation(275,275);
          signButton.setLocation(210,275);
          squarerootButton.setLocation(210,80);
          decimalButton.setLocation(145,275);     
          /*THIS IS WHAT IS NOT WORKING*/
          displayBar.setAlignmentX(RIGHT);
          displayBar.setFont(24);
          displayBar.setEditable(false);
          //Add components
          add(displayBar);
          add(oneButton);
          add(twoButton);
          add(threeButton);
          add(fourButton);
          add(fiveButton);
          add(sixButton);
          add(sevenButton);
          add(eightButton);
          add(nineButton);
          add(zeroButton);
          add(clearButton);
          add(addButton);
          add(multiplyButton);
          add(subtractButton);
          add(divideButton);
          add(equalsButton);
          add(signButton);
          add(squarerootButton);
          add(decimalButton);
     public void actionPerformed(ActionEvent e)
private static void startCalculator()
//Create and set up the window.
JFrame frame = new JFrame("Calculator");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
//Create and set up the content pane.
Calculator newContentPane = new Calculator();
newContentPane.setOpaque(true); //content panes must be opaque
frame.setContentPane(newContentPane);
//Display the window.
frame.pack();
frame.setSize(350,400);
frame.setVisible(true);
public static void main(String[] args) {
startCalculator();
}

Answer 1

something to think about!!!!!!!
<code>
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class Calculator extends JPanel implements ActionListener
     private JButton[] numberButtons;
     private JTextField displayBar;
public Calculator()
//Turn layout manager off
setLayout(null);
//Create components
displayBar = new JTextField(18);
numberButtons = new JButton[10];
for(int i=0;i<10;i++)
     numberButtons[i] = new JButton(String.valueOf(i));
     numberButtons.addActionListener(new ActionListener() {
          public void actionPerformed(java.awt.event.ActionEvent e) {
               displayBar.setText(displayBar.getText()+((JButton)e.getSource()).getText());
JButton clearButton = new JButton("Clr");
JButton addButton = new JButton("+");
JButton multiplyButton = new JButton("X");
JButton subtractButton = new JButton("-");
JButton divideButton = new JButton("/");
JButton equalsButton = new JButton("=");
JButton signButton = new JButton("-/+");
JButton squarerootButton = new JButton("v-");
JButton decimalButton = new JButton(".");
//Set button sizes - Initialize all buttons to 50x50
displayBar.setSize(320, 50);
for(int i=0;i<10;i++)
     numberButtons[i].setSize(50,50);
clearButton.setSize(50,50);
addButton.setSize(50,50);
multiplyButton.setSize(50,50);
subtractButton.setSize(50,50);
divideButton.setSize(50,50);
equalsButton.setSize(50,50);
signButton.setSize(50,50);
squarerootButton.setSize(50,50);
decimalButton.setSize(50,50);
//Set button locations
displayBar.setLocation(15,15);
numberButtons[1].setLocation(15,210);
numberButtons[2].setLocation(80,210);
numberButtons[3].setLocation(145,210);
numberButtons[4].setLocation(15,145);
numberButtons[5].setLocation(80,145);
numberButtons[6].setLocation(145,145);
numberButtons[7].setLocation(15,80);
numberButtons[8].setLocation(80,80);
numberButtons[9].setLocation(145,80);
numberButtons[0].setLocation(15,275);
clearButton.setLocation(275,80);
addButton.setLocation(210,210);
multiplyButton.setLocation(210,145);
subtractButton.setLocation(275,210);
divideButton.setLocation(275,145);
equalsButton.setLocation(275,275);
signButton.setLocation(210,275);
squarerootButton.setLocation(210,80);
decimalButton.setLocation(145,275);
/*THIS IS WHAT IS NOT WORKING*/
displayBar.setHorizontalAlignment(JTextField.RIGHT);
displayBar.setFont(displayBar.getFont().deriveFont(24f));
displayBar.setEditable(false);
//Add components
add(displayBar);
for(int i=0;i<10;i++)
     add(numberButtons[i]);
add(clearButton);
add(addButton);
add(multiplyButton);
add(subtractButton);
add(divideButton);
add(equalsButton);
add(signButton);
add(squarerootButton);
add(decimalButton);
public void actionPerformed(ActionEvent e)
private static void startCalculator()
//Create and set up the window.
JFrame frame = new JFrame("Calculator");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
//Create and set up the content pane.
Calculator newContentPane = new Calculator();
newContentPane.setOpaque(true); //content panes must be opaque
frame.setContentPane(newContentPane);
//Display the window.
frame.pack();
frame.setSize(350,400);
frame.setVisible(true);
public static void main(String[] args) {
startCalculator();
</code>