Java examples: FileOutputStream

//notepad

import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
import java.util.Scanner;
import java.io.*;

public class Notepad extends JFrame implements ActionListener
{
    private TextArea textarea = new TextArea("",0,0,TextArea.SCROLLBARS_VERTICAL_ONLY);
    
    private MenuBar menubar = new MenuBar();
    private Menu file = new Menu();
    private MenuItem openfile = new MenuItem();
    private MenuItem savefile = new MenuItem();
    private MenuItem close = new MenuItem();
    
    public Notepad(){
        this.setSize(500,500);
        this.setTitle("Java...Notepad Tutorial");
        setDefaultCloseOperation(EXIT_ON_CLOSE);
        this.textarea.setFont(new Font("Century Gothic",Font.BOLD,12));
        
        this.getContentPane().setLayout(new BorderLayout());
        this.getContentPane().add(textarea);


        this.setMenuBar(this.menubar);
        this.menubar.add(this.file);
        this.file.setLabel("File");
        
        
        this.openfile.setLabel("open");
        this.openfile.addActionListener(this);
        this.file.add(this.openfile);
        
        this.savefile.setLabel("Save");
        this.savefile.addActionListener(this);
        this.file.add(this.savefile);
        
        this.close.setLabel("Close");
        this.close.addActionListener(this);
        this.file.add(close);
        }
        
        public void actionPerformed(ActionEvent e)
        {
            if(e.getSource()==close)
            {
                this.dispose();
            }
            if(e.getSource()==openfile)
            {
                JFileChooser open = new JFileChooser();
                int option = open.showOpenDialog(this);
                if(option == JFileChooser.APPROVE_OPTION)
                {
                    this.textarea.setText("");
                    try{
                        Scanner scan = new Scanner(new FileReader(open.getSelectedFile().getPath()));
                        while(scan.hasNext())
                        this.textarea.append(scan.nextLine() +'\n');
                    }
                    catch(Exception ex)
                    {
                        System.out.println(ex.getMessage());
                    }
                }
            }
            if(e.getSource()==savefile)
            {
                JFileChooser save = new JFileChooser();
                int option = save.showSaveDialog(this);
                
                if(option == JFileChooser.APPROVE_OPTION)
                {
                    try{
                        BufferedWriter out = new BufferedWriter(new FileWriter(save.getSelectedFile().getPath()));
                        out.write(this.textarea.getText());
                        out.close();
                    }
                    catch(Exception ex)
                    {
                        System.out.println(ex.getMessage());
                    }
                }
            }
        }
        
        public static void main(String args[]) {
        Notepad app = new Notepad();
        app.setVisible(true);
        }

}

Output

FileOutputStream in java

import java.io.*;

class fileoutputstrm
{
    public static void main(String[] args) throws Exception
    {
        
        byte data[]="hi... this is a program of fileoutputstream class".getBytes();
        
        //method to write using loop
        
        FileOutputStream fileoutputstrm1 = new FileOutputStream("file1.txt");
        
        for(int index_loop=0;index_loop<data.length;index_loop++)
        {
            fileoutputstrm1.write(data[index_loop]);
        }
        
        //method to write using write() method
        
        FileOutputStream fileoutputstrm2 = new FileOutputStream("file2.txt");
        fileoutputstrm2.write(data);
        
        //method to write from specific byte to specific point
        
        FileOutputStream fileoutputstrm3 = new FileOutputStream("file3.txt");
        fileoutputstrm3.write(data,5,15);
        
        //close all files
        fileoutputstrm1.close();
        fileoutputstrm2.close();
        fileoutputstrm3.close();
        
    }
}

output

it will create 3 .txt file

Download Code from here

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