CodeseniorSoftware Tutorials

import javax.swing.*;
import java.awt.*;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.io.IOException;

public class Main extends JFrame {
    private Rectangle bounds;

    public Main() {
        setTitle("Continue From Last Location");
        setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
        setLayout(new BorderLayout());
        try {
            Rectangle dimension = (Rectangle) FileOp.readObject(FileOp.tempDirectory +   "lastLocation.tmp");
            if (dimension != null) {
                setSize(dimension.getSize());
                setLocation((int) dimension.getX(), (int) dimension.getY());
            }

        } catch (IOException e) {
            e.printStackTrace();
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        }
        setCloseListener();
        setVisible(true);

    }

    /*
     * When JFrame is closed, save last location and dimension to a file
    */
    private void setCloseListener() {
        this.addWindowListener(new WindowAdapter() {
            @Override
            public void windowClosing(WindowEvent e) {
                //this method returns Rectangle object which contains x, y coordinate values and Dimension object
                bounds = getBounds();
                try {
                    FileOp.writeObject(bounds, FileOp.tempDirectory  + "lastLocation.tmp");
                } catch (IOException e1) {
                    e1.printStackTrace();
                }
            }
        });

    }

    public static void main(String[] args) {
        new Main();
    }
}

/*
 * Write and Read File Operations
*/
public class FileOp {
    public static final String tempDirectory = System.getProperty("java.io.tmpdir");

    public static void writeObject(Object content, String filePath) throws IOException {
        FileOutputStream fos = new FileOutputStream(filePath);
        ObjectOutputStream oos = new ObjectOutputStream(fos);
        oos.writeObject(content);
        oos.close();
    }

    public static Object readObject(String filePath) throws IOException, ClassNotFoundException {
        File file = new File(filePath);
        if (file.exists()) {
            FileInputStream fis = new FileInputStream(filePath);
            ObjectInputStream ois = new ObjectInputStream(fis);
            Object content = ois.readObject();
            ois.close();
            return content;
        } else {
            return null;
        }

    }
}