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How to create Notepad in Swing

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We are going to describe How to create Notepad in Swing. Now we have created notepad by help of java Swing programming language. In this simple example we have used basic functionalities of Notepad.

How to create Notepad in Swing

Program Description:-

In this Example we have created class JFrame and implementing Action Listener is created. JFrame is the main container for swing-based application. This example we have created "textArea","Menu","MenuBar"MenuItem.The TextArea is a area of text that user easily can write and we use JFileChooser.The JFileChooser provides a simple mechanism for the user to choose a file. For information about using  JFileChooser.and we have used append() method. The Appends the given text to the end of the document. Does nothing if the model is null or the string is null or empty.

Example

package NotePad;
import java.awt.*;
import java.awt.datatransfer.Clipboard;
import java.awt.datatransfer.DataFlavor;
import java.awt.datatransfer.Transferable;
import java.awt.event.*;
import java.io.File;
import java.io.PrintWriter;
import java.util.Scanner;

import javax.swing.*;

public class Notepad extends JFrame {

	private static final long serialVersionUID = 1L;
	JFrame frame;
	JMenuBar menuBar;
	JMenu file;
	JMenu edit;
	JMenuItem open, newFile,save, exit;
	JMenuItem undo,paste, selectAll ;
	JMenu format;
	JMenu help;
	JFileChooser fileChooser;
	JTextArea textArea;
	Clipboard clip ;
	
	Notepad() {
		frame = new JFrame("Notepad Application");
		file = new JMenu("File");
		edit = new JMenu("Edit");
		format = new JMenu("Format");
		help = new JMenu("Help");
		
		newFile = new JMenuItem("New");
		open = new JMenuItem("Open");		
		save = new JMenuItem("Save");
		exit = new JMenuItem("Exit");
		undo = new  JMenuItem("Undo                 Ctrl+Z");
		paste = new JMenuItem("Paste                Ctrl+V");
		selectAll = new JMenuItem("Select All       Ctrl+A ");
		textArea = new JTextArea();
		fileChooser = new JFileChooser();
		menuBar = new JMenuBar();
		
		frame.setLayout(new BorderLayout());
		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		
        frame.add(textArea);
		file.add(open);
		file.add(newFile);
		file.add(save);
		file.add(exit);
		edit.add(undo);
		edit.add(paste);
		edit.add(selectAll);
		menuBar.add(file);
		menuBar.add(edit);
		menuBar.add(format);
		menuBar.add(help);
		
		frame.setJMenuBar(menuBar);
		
		OpenListener openL = new OpenListener();
		NewListener NewL = new NewListener();
		SaveListener saveL = new SaveListener();
		ExitListener exitL = new ExitListener();
		open.addActionListener(openL);
		newFile.addActionListener(NewL);
		save.addActionListener(saveL);
		exit.addActionListener(exitL);
		//UndoListener UndoL = new UndoListener();
		PasteListener pasteL = new PasteListener();
		//EditListener EditL = new EditListener();
		//SelectListener SelectL = new SelectListener();
		//undo.addActionListener(UndoL);
		//paste.addActionListener(EditL);
		//selectAll.addActionListener(SelectL);
		frame.setSize(800, 600);
		frame.setVisible(true);
	}
	
	class OpenListener implements ActionListener {
		public void actionPerformed(ActionEvent e) {
			if (JFileChooser.APPROVE_OPTION == fileChooser.showOpenDialog(frame)) {
				File file = fileChooser.getSelectedFile();
				textArea.setText("");
				Scanner in = null;
				try {
					in = new Scanner(file);
					while(in.hasNext()) {
						String line = in.nextLine();
						textArea.append(line+"\n");
					}
				} catch (Exception ex) {
					ex.printStackTrace();
				} finally {
					in.close();
				}
			}
		}
	}
	
	class SaveListener implements ActionListener {
		public void actionPerformed(ActionEvent e) {
			if (JFileChooser.APPROVE_OPTION == fileChooser.showSaveDialog(frame)) {
				File file = fileChooser.getSelectedFile();
				PrintWriter out = null;
				try {
					out = new PrintWriter(file);
					String output = textArea.getText();
					System.out.println(output);
					out.println(output);
				} catch (Exception ex) {
					ex.printStackTrace();
				} finally {
					try {
						out.flush();
						} catch(Exception ex1) 
						{
							
						}
					try {
						out.close();
						} catch(Exception ex1) {
							
						}
				}
			}
		}
	}
	
	class NewListener implements ActionListener {
		public void actionPerformed(ActionEvent e) {
			textArea.setText("");
			//frame.add(newFile);
			//textArea.(newFile+"\n");
			
			
			
		}
	}
	class ExitListener implements ActionListener {
		public void actionPerformed(ActionEvent e) {
			System.exit(0);
		}
	}
	
	
	
	class PasteListener implements ActionListener {
		public void actionPerformed(ActionEvent e) {
			Transferable cliptran = clip.getContents(Notepad.this);
	         try
	             {
	             String sel = (String) cliptran.getTransferData(DataFlavor.stringFlavor);
	             textArea.replaceRange(sel,textArea.getSelectionStart(),textArea.getSelectionEnd());
	         }
	         catch(Exception exc)
	             {
	             System.out.println("not string flavour");
	         }
			
		}
	}
	
	
	public static void main(String args[]) {
		Notepad n = new Notepad();
	}
}

OutPut

Download Source Code

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Posted on: August 6, 2013

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