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| package lab5;
import javax.swing.SwingUtilities;
import java.awt.BorderLayout;
import java.awt.GraphicsConfiguration;
import java.awt.*;
import java.awt.event.*;
import java.io.*;
import java.util.Scanner;
import javax.swing.*;
public class Dop14 extends JFrame implements ActionListener {
private static String Summ = null;
private static int n = 0;
private static double x = 0;
private static String fileName = null;
private JButton buttonSave;
private JPanel contentPane;
private JFileChooser chooser;
private Object buttonOpen;
@SuppressWarnings("restriction")
public Dop14(String title) {
super(title);
setDefaultCloseOperation(WindowConstants.DISPOSE_ON_CLOSE);
chooser.setCurrentDirectory(new File("."));
setLayout(new FlowLayout());
buttonOpen = new JButton("Open File and load data");
buttonSave.addActionListener(this);
add(buttonSave);
buttonSave = new JButton("Save Summ");
pack();
}
private void add(Object buttonOpen2) {
// TODO Auto-generated method stub
}
public Dop14() {
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setBounds(100, 100, 450, 300);
contentPane = new JPanel();
contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
contentPane.setLayout(new BorderLayout(0, 0));
setContentPane(contentPane);
}
public void actionPerformed(ActionEvent e) {
if (e.getSource() == buttonOpen) {
if (chooser.showOpenDialog(this) == JFileChooser.APPROVE_OPTION) {
readFromFile(chooser.getSelectedFile().getPath());
}
} else {
if (chooser.showSaveDialog(this) == JFileChooser.APPROVE_OPTION) {
writeToFile(chooser.getSelectedFile().getPath());
}
}
}
private void writeToFile(String path) {
if (new File(fileName).exists()) {
if (JOptionPane.showConfirmDialog(null,
"A file exists. To rewrite?") != JOptionPane.YES_OPTION)
return;
}
try {
PrintWriter out = new PrintWriter(new FileWriter(fileName));
for (int i = 0; i <= n; i++) {
Summ += Math.pow(x, i);
}
out.println("Summ is: " + Summ);
out.close();
} catch (IOException e) {
JOptionPane.showMessageDialog(null, "Can't create File!", "Error",
JOptionPane.ERROR_MESSAGE);
}
}
@SuppressWarnings("restriction")
private void readFromFile(String path) {
// TODO Auto-generated method stub
try {
FileReader reader = new FileReader(fileName);
Scanner scanner = new Scanner(reader);
try {
x = scanner.nextDouble();
n = scanner.nextInt();
}
catch (Exception e) {
JOptionPane.showMessageDialog(null,
"File has invalid format!", "Error", JOptionPane.ERROR_MESSAGE);
}
finally {
reader.close();
}
}
catch (IOException e) {
JOptionPane.showMessageDialog(null,
"Error read from File!", "Error", JOptionPane.ERROR_MESSAGE);}
}
public static void main(String[] args) {
new Dop14("Summ").setVisible(true);
}
} |
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