Saving multiple lines in a file

Question

ok I have a simple calculator that when you inset the text into text fiel one and when you insert text into tex input 2 when you hit the add subtract or any of the other buttons it will add the date, time, input 1, input 2, calculation performed, and answer. It is also supposed to be able to store each calculation not just one. I am kinda new to programming in Java and would love some hel here is my code
import java.awt.*;
import javax.swing.*;
import java.awt.event.*; // added
import java.io.*;
import java.util.*;
public class JohnathanNoeExam7 extends JFrame {
     private Container contentPane;
     private JPanel leftPanel;
     private JPanel centerPanel;
     private JPanel buttonPanel;
     public JTextField input1TextField;
     private JTextField input2TextField;
     private JLabel answerLabel;
     private JButton plusButton;
     private JButton minusButton;
     private JButton divisionButton;
     private JButton multiplyButton;
     private JButton modulusButton;
     public JohnathanNoeExam7() {     
          super("Simple Calculator");
          contentPane = this.getContentPane();
          this.setSize(250, 100);
          Dimension frameSize = this.getSize();
          Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
          this.setLocation((screenSize.width - frameSize.width)/2,
                            (screenSize.height - frameSize.height)/2);
          leftPanel = new JPanel();
          leftPanel.setLayout(new GridLayout(3, 1));
          leftPanel.add(new JLabel("Input 1:  "));
          leftPanel.add(new JLabel("Input 2:  "));
          leftPanel.add(new JLabel("Answer:  "));
          contentPane.add(leftPanel, BorderLayout.WEST);
          centerPanel = new JPanel();
          centerPanel.setLayout(new GridLayout(3, 1));
          input1TextField = new JTextField(10);
          input2TextField = new JTextField(10);
          answerLabel = new JLabel();
          centerPanel.add(input1TextField);
          centerPanel.add(input2TextField);
          centerPanel.add(answerLabel);
          contentPane.add(centerPanel, BorderLayout.CENTER);
          buttonPanel = new JPanel();
          buttonPanel.setLayout(new GridLayout(5, 1));
          plusButton = new JButton("+");
          minusButton = new JButton("-");
          divisionButton = new JButton("/");
          multiplyButton = new JButton("*");
          modulusButton = new JButton("%");
          buttonPanel.add(plusButton);
          buttonPanel.add(minusButton);
          buttonPanel.add(divisionButton);
          buttonPanel.add(multiplyButton);
          buttonPanel.add(modulusButton);
          contentPane.add(buttonPanel, BorderLayout.EAST);
          ActionListener l = new ActionListener() {
              public void actionPerformed(ActionEvent e) {
               double d1 = Double.parseDouble(input1TextField.getText());
               double d2 = Double.parseDouble(input2TextField.getText());
               if (e.getSource() == plusButton)
                    answerLabel.setText("" + (d1 + d2));
               else if (e.getSource() == minusButton)
                    answerLabel.setText("" + (d1 - d2));
               else if (e.getSource() == divisionButton)
                    answerLabel.setText("" + (d1 / d2));
               else if (e.getSource() == multiplyButton)
                    answerLabel.setText("" + (d1 * d2));
               else answerLabel.setText("" + (d1 % d2));
               FileOutputStream out;
               PrintStream p;     
               double d3 = Double.parseDouble(answerLabel.getText());
               try
                    out = new FileOutputStream("Calculation.log");
                    p = new PrintStream( out );
                    p.println("Input 1: " + d1 + " "  + "Input 2: " + " " + d2 + " " + "Answer: " + d3);
                    p.close();
               catch(Exception f)
                    System.err.println("Error writing to file");
          plusButton.addActionListener(l);
          minusButton.addActionListener(l);
          divisionButton.addActionListener(l);
          multiplyButton.addActionListener(l);
          modulusButton.addActionListener(l);
          WindowListener w = new WindowAdapter() {
              public void windowClosing(WindowEvent e) {
               // Note the need to preface "this." with
               // the name of the outer class.
                   JohnathanNoeExam7.this.dispose();
               System.exit(0);
          this.addWindowListener(w);
            this.setVisible(true);
                  public static void main(String args[]){
          new JohnathanNoeExam7();
}Thanks for any help you can provide

Answer 1

I didn't look at anything else but if you want to write more than one line ever to your file you should change this
out = new FileOutputStream("Calculation.log");to this...
out = new FileOutputStream("Calculation.log",true);A quick look at the API reveals the follow constructor FileOutputStream(File file, boolean append) append means should I add on the end of the file or over-write what is there.
By default you over-write. So in our case we say true instead which says add on to what is there.
At the end of that little snippet you shoudl be closing that stream as well.
So where you have
p.close();You should have
p.close();
out.close();