Question

I have a text field and a save button in my Frame. When the JFrame window is closed or is about to be closed, I want to automatically save the data in the field to a text file in a known directory. How can I do that?

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Answer 1

Explanation:

Approach: To solve this problem, the following steps are followed:

First, we need to create a frame using JFrame.

Next create JLabels, JTextFields, JComboBoxes, JButtons and set their bounds respectively.

Name these components accordingly and set their bounds.

Now, in order to save the data into the text file on button click, we need to add Event Handlers. In this case, we will add ActionListener to perform an action method known as actionPerformed in which first we need to get the values from the text fields which is default as a “string”.

Finally, the Jbuttons, JLabels, JTextFields and JComboBoxes are added to the JFrame and the text is stored in a text file.

Below is the implementation of the above approach:

// Java program to write a student

// information in JFrame and

// storing it in a file

import javax.swing.*;

import java.awt.*;

import java.awt.event.*;

import java.io.*;

public class GFG {

// Function to write a student

// information in JFrame and

// storing it in a file

public static void StudentInfo()

{

// Creating a new frame using JFrame

JFrame f

= new JFrame(

"Student Details Form");

// Creating the labels

JLabel l1, l2, l3, l4, l5;

// Creating three text fields.

// One for student name, one for

// college mail ID and one

// for Mobile No

JTextField t1, t2, t3;

// Creating two JComboboxes

// one for Branch and one

// for Section

JComboBox j1, j2;

// Creating two buttons

JButton b1, b2;

// Naming the labels and setting

// the bounds for the labels

l1 = new JLabel("Student Name:");

l1.setBounds(50, 50, 100, 30);

l2 = new JLabel("College Email ID:");

l2.setBounds(50, 120, 120, 30);

l3 = new JLabel("Branch:");

l3.setBounds(50, 190, 50, 30);

l4 = new JLabel("Section:");

l4.setBounds(420, 50, 70, 30);

l5 = new JLabel("Mobile No:");

l5.setBounds(420, 120, 70, 30);

// Creating the textfields and

// setting the bounds for textfields

t1 = new JTextField();

t1.setBounds(150, 50, 130, 30);

t2 = new JTextField();

t2.setBounds(160, 120, 130, 30);

t3 = new JTextField();

t3.setBounds(490, 120, 130, 30);

// Creating two string arrays one for

// braches and other for sections

String s1[]

= { " ", "CSE", "ECE", "EEE",

"CIVIL", "MEC", "Others" };

String s2[]

= { " ", "Section-A", "Section-B",

"Section-C", "Section-D",

"Section-E" };

// Creating two JComboBoxes one for

// selecting branch and other for

// selecting the section

// and setting the bounds

j1 = new JComboBox(s1);

j1.setBounds(120, 190, 100, 30);

j2 = new JComboBox(s2);

j2.setBounds(470, 50, 140, 30);

// Creating one button for Saving

// and other button to close

// and setting the bounds

b1 = new JButton("Save");

b1.setBounds(150, 300, 70, 30);

b2 = new JButton("close");

b2.setBounds(420, 300, 70, 30);

// Adding action listener

b1.addActionListener(new ActionListener() {

public void actionPerformed(ActionEvent e)

{

// Getting the text from text fields

// and JComboboxes

// and copying it to a strings

String s1 = t1.getText();

String s2 = t2.getText();

String s3 = j1.getSelectedItem() + "";

String s4 = j2.getSelectedItem() + "";

String s5 = t3.getText();

if (e.getSource() == b1) {

try {

// Creating a file and

// writing the data

// into a Textfile.

FileWriter w

= new FileWriter(

"GFG.txt", true);

w.write(s1 + "\n");

w.write(s2 + "\n");

w.write(s3 + "\n");

w.write(s4 + "\n");

w.write(s5 + "\n");

w.close();

}

catch (Exception ae) {

System.out.println(ae);

}

}

// Shows a Pop up Message when

// save button is clicked

JOptionPane

.showMessageDialog(

f,

"Successfully Saved"

+ " The Details");

}

});

// Action listener to close the form

b2.addActionListener(new ActionListener() {

public void actionPerformed(ActionEvent e)

{

f.dispose();

}

});

// Default method for closing the frame

f.addWindowListener(new WindowAdapter() {

public void windowClosing(WindowEvent e)

{

System.exit(0);

}

});

// Adding the created objects

// to the frame

f.add(l1);

f.add(t1);

f.add(l2);

f.add(t2);

f.add(l3);

f.add(j1);

f.add(l4);

f.add(j2);

f.add(l5);

f.add(t3);

f.add(b1);

f.add(b2);

f.setLayout(null);

f.setSize(700, 600);

f.setVisible(true);

}

// Driver code

public static void main(String args[])

{

StudentInfo();

Answer 2

Explanation:

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1. Australia