Errors with buttons and clearing program

Question

I have 3 errors in this program. How do I set up the text field for null (''')?
import java.awt.*;
import javax.swing.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
public class Calculator extends JFrame implements ActionListener {
   private JPanel panelAdder;
   private JLabel labela;
   private JLabel labelt;
   private JLabel labelr;
   private JTextField textFieldAmount;
   private JTextField textFieldTerm;
   private JTextField textFieldRate;
   private JTextField textFieldResult;
   private JTextField textFieldNull;
   private JButton buttonCalc;
   private JButton buttonClear;
   private JButton buttonExit;
public void Calculator1() {
  initComponents();
  setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
  setVisible(true);
  pack();
  // Add Listeners
  buttonCalc.addActionListener(this);
  buttonClear.addActionListener(this);
public void actionPerformed(ActionEvent event) {
    Object source = event.getSource ();
     if (source == buttonCalc); {
        setResultValue();
     if (source == buttonClear); {
          newJTextFieldNull("");
public void initComponents() {
//Initialize Components
      panelAdder = new JPanel();
      labela = new JLabel("Amount");
      textFieldAmount = new JTextField();
      labelt = new JLabel("Term");
      textFieldTerm = new JTextField();
      labelr = new JLabel("Rate");
      textFieldRate = new JTextField();
      textFieldResult = new JTextField();
      buttonCalc = new JButton("Calculate");
      JTextField amountField = new JTextField("");
      buttonClear = new JButton("Clear");
      buttonExit =  new JButton("Exit");
//Set Object Attributes
textFieldResult.setEditable(false);
textFieldResult.setColumns(8);
textFieldAmount.setColumns(6);
textFieldTerm.setColumns(2);
textFieldRate.setColumns(2);
Container contentPane = getContentPane();
contentPane.setLayout(new FlowLayout());
//Lets add the components to the panel
panelAdder.add(labela);
panelAdder.add(textFieldAmount);
panelAdder.add(labelt);
panelAdder.add(textFieldTerm);
panelAdder.add(labelr);
panelAdder.add(textFieldRate);
panelAdder.add(buttonCalc);
panelAdder.add(textFieldResult);
panelAdder.add(buttonClear);
panelAdder.add(buttonExit);
contentPane.add(panelAdder);
setVisible(true);
private void setResultValue() {
   double amount = Double.parseDouble (textFieldAmount.getText());
   double rate = Double.parseDouble (textFieldRate.getText());
   double term = Integer.parseInt(textFieldTerm.getText());
   double result = amount * ( rate * Math.pow ( ( 1 + rate ), term ) ) / ( Math.pow( ( 1 + rate ), term ) - 1 );
   textFieldResult.setText(Double.toString(result));
public static void main(String[] args) {
  Calculator frame = new Calculator();
}The error is:
line 38: cannot find symbol newJTextFieldNull(''');

Answer 1

You're trying to call a method that doesn't exist.
1) You either have to do something different or create the method.
2) You need to learn to believe what the compiler is telling your. The answer is in the error message.
3) Your class also doesn't have a constructor.