66_SelectAFile

// JFileChooser = A GUI mechanism that let's a user choose a file (helpful for opening or saving file)

<Main.java>
public class Main {
    public static void main(String[] args) {

        new MyFram();

    }
}

<MyFram.java>
import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.File;

public class MyFram extends JFrame implements ActionListener {
    JButton button;
    MyFram(){
        this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        this.setLayout(new FlowLayout());

        button = new JButton("Select File");
        button.addActionListener(this);

        this.add(button);
        this.pack();
        this.setVisible(true);
    }

    @Override
    public void actionPerformed(ActionEvent e) {
        if(e.getSource()==button){
            JFileChooser fileChooser = new JFileChooser();
            /*
            //TO OPEN
            int response = fileChooser.showOpenDialog(null);//(parent): select file to open

            if(response == JFileChooser.APPROVE_OPTION){
                JFileChooser jFileChooser;
                File file = new File(fileChooser.getSelectedFile().getAbsolutePath()); //Show path
                System.out.println(file);
            }
           */
            //TO SAVE
            fileChooser.setCurrentDirectory(new File("."));
            int response2 = fileChooser.showSaveDialog(this);//Select file to save
        }
    }
}