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Java text editor program app tutorial for beginners

#Java #text #editor #beginners #program #app #tutorial

public class Main {

public static void main(String[] args) {

new TextEditor();

}
}
import java.awt.*;
import java.awt.event.*;
import java.io.*;
import java.util.*;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.filechooser.*;

public class TextEditor extends JFrame implements ActionListener{

JTextArea textArea;
JScrollPane scrollPane;
JLabel fontLabel;
JSpinner fontSizeSpinner;
JButton fontColorButton;
JComboBox fontBox;

JMenuBar menuBar;
JMenu fileMenu;
JMenuItem openItem;
JMenuItem saveItem;
JMenuItem exitItem;

TextEditor(){
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
this.setTitle("Bro text Editor");
this.setSize(500, 500);
this.setLayout(new FlowLayout());
this.setLocationRelativeTo(null);

textArea = new JTextArea();
textArea.setLineWrap(true);
textArea.setWrapStyleWord(true);
textArea.setFont(new Font("Arial",Font.PLAIN,20));

scrollPane = new JScrollPane(textArea);
scrollPane.setPreferredSize(new Dimension(450,450));
scrollPane.setVerticalScrollBarPolicy(ScrollPaneConstants.VERTICAL_SCROLLBAR_ALWAYS);

fontLabel = new JLabel("Font: ");

fontSizeSpinner = new JSpinner();
fontSizeSpinner.setPreferredSize(new Dimension(50,25));
fontSizeSpinner.setValue(20);
fontSizeSpinner.addChangeListener(new ChangeListener() {

@Override
public void stateChanged(ChangeEvent e) {

textArea.setFont(new Font(textArea.getFont().getFamily(),Font.PLAIN,(int) fontSizeSpinner.getValue()));
}

});

fontColorButton = new JButton("Color");
fontColorButton.addActionListener(this);

String[] fonts = GraphicsEnvironment.getLocalGraphicsEnvironment().getAvailableFontFamilyNames();

fontBox = new JComboBox(fonts);
fontBox.addActionListener(this);
fontBox.setSelectedItem("Arial");

// ------ menubar ------

menuBar = new JMenuBar();
fileMenu = new JMenu("File");
openItem = new JMenuItem("Open");
saveItem = new JMenuItem("Save");
exitItem = new JMenuItem("Exit");

openItem.addActionListener(this);
saveItem.addActionListener(this);
exitItem.addActionListener(this);

fileMenu.add(openItem);
fileMenu.add(saveItem);
fileMenu.add(exitItem);
menuBar.add(fileMenu);

// ------ /menubar ------

this.setJMenuBar(menuBar);
this.add(fontLabel);
this.add(fontSizeSpinner);
this.add(fontColorButton);
this.add(fontBox);
this.add(scrollPane);
this.setVisible(true);
}

@Override
public void actionPerformed(ActionEvent e) {

if(e.getSource()==fontColorButton) {
JColorChooser colorChooser = new JColorChooser();

Color color = colorChooser.showDialog(null, "Choose a color", Color.black);

textArea.setForeground(color);
}

if(e.getSource()==fontBox) {
textArea.setFont(new Font((String)fontBox.getSelectedItem(),Font.PLAIN,textArea.getFont().getSize()));
}

if(e.getSource()==openItem) {
JFileChooser fileChooser = new JFileChooser();
fileChooser.setCurrentDirectory(new File("."));
FileNameExtensionFilter filter = new FileNameExtensionFilter("Text files", "txt");
fileChooser.setFileFilter(filter);

int response = fileChooser.showOpenDialog(null);

if(response == JFileChooser.APPROVE_OPTION) {
File file = new File(fileChooser.getSelectedFile().getAbsolutePath());
Scanner fileIn = null;

try {
fileIn = new Scanner(file);
if(file.isFile()) {
while(fileIn.hasNextLine()) {
String line = fileIn.nextLine()+"\n";
textArea.append(line);
}
}
} catch (FileNotFoundException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
finally {
fileIn.close();
}
}
}
if(e.getSource()==saveItem) {
JFileChooser fileChooser = new JFileChooser();
fileChooser.setCurrentDirectory(new File("."));

int response = fileChooser.showSaveDialog(null);

if(response == JFileChooser.APPROVE_OPTION) {
File file;
PrintWriter fileOut = null;

file = new File(fileChooser.getSelectedFile().getAbsolutePath());
try {
fileOut = new PrintWriter(file);
fileOut.println(textArea.getText());
}
catch (FileNotFoundException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
finally {
fileOut.close();
}
}
}
if(e.getSource()==exitItem) {
System.exit(0);
}
}
}