Text Editor1

1. 1
// Creating a text File using FileWriter
importjava.io.FileWriter;
importjava.io.IOException;
classCreateFile
{
publicstaticvoidmain(String[] args) throwsIOException
{
// Accepta string
Stringstr = "File HandlinginJavausing"+
" FileWriterandFileReader";
// attach a file toFileWriter
FileWriterfw=newFileWriter("output.txt");
// readcharacter wise fromstringandwrite
// intoFileWriter
for (inti = 0; i < str.length();i++)
fw.write(str.charAt(i));
System.out.println("Writingsuccessful");
//close the file
fw.close();
}
}

2. 2
// Reading data froma file using FileReader
importjava.io.FileNotFoundException;
importjava.io.FileReader;
importjava.io.IOException;
classReadFile
{
publicstaticvoidmain(String[] args) throwsIOException
{
// variable declaration
intch;
// checkif File existsornot
FileReaderfr=null;
try
{
fr = newFileReader("text");
}
catch (FileNotFoundExceptionfe)
{
System.out.println("Filenotfound");
}
// readfromFileReadertillthe endof file
while ((ch=fr.read())!=-1)
System.out.print((char)ch);
// close the file
fr.close();
}
}

3. 3
// Java Programto create a text editor using java
importjava.awt.*;
importjavax.swing.*;
importjava.io.*;
importjava.awt.event.*;
importjavax.swing.plaf.metal.*;
importjavax.swing.text.*;
classeditorextendsJFrame implementsActionListener{
// Textcomponent
JTextAreat;
// Frame
JFrame f;
// Constructor
editor()
{
// Create a frame
f = newJFrame("editor");
try {
// Setmetl lookandfeel
UIManager.setLookAndFeel("javax.swing.plaf.metal.MetalLookAndFeel");
// Settheme toocean
MetalLookAndFeel.setCurrentTheme(new OceanTheme());
}
catch (Exceptione) {
}

4. 4
// Textcomponent
t = newJTextArea();
// Create a menubar
JMenuBarmb = newJMenuBar();
// Create amenuformenu
JMenum1 = newJMenu("File");
// Create menuitems
JMenuItemmi1= newJMenuItem("New");
JMenuItemmi2= newJMenuItem("Open");
JMenuItemmi3= newJMenuItem("Save");
JMenuItemmi9= newJMenuItem("Print");
// Addactionlistener
mi1.addActionListener(this);
mi2.addActionListener(this);
mi3.addActionListener(this);
mi9.addActionListener(this);
m1.add(mi1);
m1.add(mi2);
m1.add(mi3);
m1.add(mi9);
// Create amenuformenu
JMenum2 = newJMenu("Edit");

5. 5
// Create menuitems
JMenuItemmi4= newJMenuItem("cut");
JMenuItemmi5= newJMenuItem("copy");
JMenuItemmi6= newJMenuItem("paste");
// Addactionlistener
mi4.addActionListener(this);
mi5.addActionListener(this);
mi6.addActionListener(this);
m2.add(mi4);
m2.add(mi5);
m2.add(mi6);
JMenuItemmc= newJMenuItem("close");
mc.addActionListener(this);
mb.add(m1);
mb.add(m2);
mb.add(mc);
f.setJMenuBar(mb);
f.add(t);
f.setSize(500,500);
f.show();
}

6. 6
// If a button ispressed
publicvoidactionPerformed(ActionEvente)
{
Strings = e.getActionCommand();
if (s.equals("cut")) {
t.cut();
}
else if (s.equals("copy")) {
t.copy();
}
else if (s.equals("paste")) {
t.paste();
}
else if (s.equals("Save")) {
// Create an objectof JFileChooserclass
JFileChooserj =new JFileChooser("f:");
// Invoke the showsSaveDialogfunctiontoshow the save dialog
intr = j.showSaveDialog(null);
if (r == JFileChooser.APPROVE_OPTION) {
// Setthe label tothe path of the selecteddirectory
File fi = new File(j.getSelectedFile().getAbsolutePath());
try {
// Create a file writer
FileWriterwr= new FileWriter(fi,false);

7. 7
// Create bufferedwritertowrite
BufferedWriterw = new BufferedWriter(wr);
// Write
w.write(t.getText());
w.flush();
w.close();
}
catch (Exceptionevt) {
JOptionPane.showMessageDialog(f,evt.getMessage());
}
}
// If the user cancelledthe operation
else
JOptionPane.showMessageDialog(f,"the usercancelledthe operation");
}
else if (s.equals("Print")) {
try {
// printthe file
t.print();
}
catch (Exceptionevt) {
JOptionPane.showMessageDialog(f,evt.getMessage());
}
}
else if (s.equals("Open")) {
// Create an objectof JFileChooserclass

8. 8
JFileChooserj =new JFileChooser("f:");
// Invoke the showsOpenDialogfunctiontoshow the save dialog
intr = j.showOpenDialog(null);
// If the user selectsafile
if (r == JFileChooser.APPROVE_OPTION) {
// Setthe label tothe path of the selecteddirectory
File fi = new File(j.getSelectedFile().getAbsolutePath());
try {
// String
Strings1 = "", sl = "";
// File reader
FileReaderfr= new FileReader(fi);
// Bufferedreader
BufferedReaderbr= new BufferedReader(fr);
// Initilize sl
sl = br.readLine();
// Take the inputfrom the file
while ((s1= br.readLine())!=null) {
sl = sl + "n" + s1;
}
// Setthe text

9. 9
t.setText(sl);
}
catch (Exceptionevt) {
JOptionPane.showMessageDialog(f,evt.getMessage());
}
}
// If the user cancelledthe operation
else
JOptionPane.showMessageDialog(f,"the usercancelledthe operation");
}
else if (s.equals("New")) {
t.setText("");
}
else if (s.equals("close")) {
f.setVisible(false);
}
}
// Main class
publicstaticvoidmain(Stringargs[])
{
editore = neweditor();
}
}
https://www.geeksforgeeks.org/file-handling-java-using-filewriter-filereader/
https://www.geeksforgeeks.org/different-ways-reading-text-file-java/
https://www.geeksforgeeks.org/java-swing-create-a-simple-text-editor/
https://sites.google.com/site/tyroprogramming/java/text-editor