Java FileOutputStream write() Method

The write(byte[] b) method of FileOutputStream class is used to write b.length bytes from the specified byte array to this file output stream.

Syntax

Parameter

b - the data.

Return Value

This method does not return any value.

Exception

IOException - If any I/O error occurs.

Example 1

import java.io.*;
import java.util.*;
public class FileOutputStreamWrite1 {
    public static void main(String[] args) {
         File file=null;
          FileInputStream fin=null;
          FileOutputStream fout=null;
          Scanner sc= null;    // TODO Auto-generated method stub
 try {
     // creating a file
    file = new File("./Write.txt");
    file.createNewFile();
    //taking input from the user
    sc= new  Scanner(System.in);
    System.out.print("Enter 5  byte to write into a file");
    byte[] a = new byte[5];
    for(int i = 0; i<5; i++)
    {a[i]= sc.nextByte();}
    System.out.println("you enter  byte successfully");
    // write byte's into file
    fout= new FileOutputStream(file);
    fout.write(a);
    //reading a byte's that are stored into a file
    fin= new FileInputStream(file);
    int read;
    System.out.println("byte that you enter into the File is ");
    while((read=fin.read())!=-1)    
    {    System.out.print("  "+read+"  ");
    }}
       catch(Exception e)
 {System.out.println(" Sorry invalid input  "+e);
      }}}

Output:

Enter  5 byte to write into a file
23
67
65
55
45
You Enter  5  byte successfully
byte that you enter into the File is
  23    67    65    55    45

Example 2

import java.io.*;
import java.util.*;
public class FileOutputStreamWrite2 {
 public static void main(String[] args) {
         File file=null;
          FileInputStream fin=null;
          FileOutputStream fout=null;
 try {
     // creating a file
    file = new File("./Write.txt");
    file.createNewFile();
    //taking input from the user
    System.out.print("byte's ---->"+"23,45,67,78,98,67"+"<--->that is  write into a file<---->");
    byte[] a = {23,45,67,78,98,67};
    System.out.println();
    System.out.println("successfully write byte's into a file");
    // write byte's into file
    fout= new FileOutputStream(file);
    fout.write(a);
    //reading a byte's that are stored into a file
    fin= new FileInputStream(file);
    int read;
    System.out.println("byte that you enter into the File is ");
    System.out.println();
    while((read=fin.read())!=-1)    
    {    System.out.print("  "+read+"  ");
    }}
       catch(Exception e)
 {System.out.println(" Sorry invalid input  "+e);
      }}}

Output:

byte's ---->23,45,67,78,98,67<--->that is  write into a file<---->
successfully write byte's into a file
byte that you enter into the File is

  23    45    67    78    98    67

Example 3

import java.io.*;
import java.util.*;
public class FileOutputStreamWrite3 {
 public static void main(String[] args) {
         File file=null;
          FileInputStream fin=null;
          FileOutputStream fout=null;
 try {
     // creating a file
    file = new File("./Write.txt");
    file.createNewFile();
    //taking input from the user
    System.out.print("byte's ---->"+"23,45,67,78,98,67"+"<--->that is  write into a file<---->");
    byte[] a = {33,55,66,78,90};
    System.out.println();
    System.out.println("successfully write byte's into a file");
    // write byte's into file
    fout= new FileOutputStream(file);
    fout.write(a);
    //reading a byte's that are stored into a file
    fin= new FileInputStream(file);
    int read;
    System.out.println();
    System.out.println("character value of that byte's  that you enter into the File is ");
    System.out.println();
    while((read=fin.read())!=-1)    
    {    System.out.print("  "+(char)read+"  ");
    }}
       catch(Exception e)
 {System.out.println(" Sorry invalid input  "+e);
      }}}

Output:

byte's ---->23,45,67,78,98,67<--->that is  write into a file<---->
successfully write byte's into a file

character value of that byte's  that you enter into the File is

  !    7    B    N    Z

Java FileOutputStream write(byte[] b, int off, int len) Method

The write(byte[] b, int off, int len) method of Java FileOutputStream class is used to write data from the given maximum length(len) of the data starting from the given offset.

Syntax

Parameter

b - The data.

off - The start offset in the data.

slen - The number of bytes to write.

Return Value

This method does not return a value.

Exception

IOException - If an I/O error occurs.

Example 1

import java.io.*;
import java.util.*;
public class FileOutputStreamWrite14 {
 public static void main(String[] args) {
         File file=null;
          FileInputStream fin=null;
          FileOutputStream fout=null;
 try {
     // creating a file
    file = new File("./Write.txt");
    file.createNewFile();
    //taking input from the user
    System.out.print("byte's ---->"+" 23 ,45 ,67 ,78 ,98 ,67 "+"<--->that is  write into a file<---->");
    byte[] a = {23,45,67,78,98,67};
    System.out.println();
    System.out.println("successfully write byte's into a file--->"+" 2 index position  to 3 index position.");
    // write byte's into file
    fout= new FileOutputStream(file);
    // write byte's into a file from 2 index to 3 index position.
      fout.write(a, 2, 3);;
    //reading a byte's that are stored into a file
    fin= new FileInputStream(file);
    int read;
    System.out.println("byte that you enter into the File is ");
    System.out.println();
    while((read=fin.read())!=-1)    
    {    System.out.print("  "+read+"  ");
    }}
       catch(Exception e)
 {System.out.println(" Sorry invalid input  "+e);
      }}}

Output:

byte's ----> 23 ,45 ,67 ,78 ,98 ,67 <--->that is  write into a file<---->
successfully write byte's into a file---> 2 index position  to 3 index position.
byte that you enter into the File is

  67    78    98

Example 2

import java.io.*;
import java.util.*;
public class FileOutputStreamWrite5 {
 public static void main(String[] args) {
         File file=null;
          FileInputStream fin=null;
          FileOutputStream fout=null;
 try {
     // creating a file
    file = new File("./Write.txt");
    file.createNewFile();
    //taking input from the user
    System.out.println("byte's ---->"+"23,45,67,78,98,67"+"<--->that is  write into a file<---->");
    System.out.println("write byte' from 2 index position to the next 2 postion");
    byte[] a = {33,55,66,78,90};
    System.out.println();
    System.out.println("successfully write byte's into a file");
    // write byte's into file
    fout= new FileOutputStream(file);
    fout.write(a, 2, 2);;
    //reading a byte's that are stored into a file
    fin= new FileInputStream(file);
    int read;
    System.out.println();
    System.out.println("character value of that byte's  that you enter into the File is ");
    System.out.println();
    while((read=fin.read())!=-1)    
    {    System.out.print("  "+(char)read+"  ");
    }}
       catch(Exception e)
 {System.out.println(" Sorry invalid input  "+e);
      }}}

Output:

byte's ---->23,45,67,78,98,67<--->that is  write into a file<---->
write byte' from 2 index position to the next 2 postion

successfully write byte's into a file

character value of that byte's  that you enter into the File is

  B    N

Java FileOutputStream write(int b) Method

The write(int b) method of Java FileOutputStream class is used to write the specified byte to this file output stream.

Syntax

Parameter

b - The byte.

Return Value

This method does not return a value.

Exception

IOException - If an I/O error occurs.

Example 1

import java.io.*;
import java.util.*;
public class FileOutputStreamWrite6 {
 public static void main(String[] args) {
         File file=null;
          FileInputStream fin=null;
          FileOutputStream fout=null;
          Scanner sc= null;    // TODO Auto-generated method stub
 try {
     // creating a file
    file = new File("./Write.txt");
    file.createNewFile();
    //taking input from the user
    sc= new  Scanner(System.in);
    System.out.print("Enter a  byte to write into a file");
    byte     a= sc.nextByte();
    System.out.println("you enter  byte successfully");
    // write byte's into file
    fout= new FileOutputStream(file);
    fout.write(a);
    //reading a byte's that are stored into a file
    fin= new FileInputStream(file);
    int read;
    System.out.println("byte that you enter into the File is ");
    while((read=fin.read())!=-1)    
    {    System.out.print("  "+read+"  ");
    }}
       catch(Exception e)
 {System.out.println(" Sorry invalid input  "+e);
      }}}

Output:

Enter a  byte to write into a file
23
you enter  byte successfully
byte that you enter into the File is
 23

Example 2

import java.io.*;
import java.util.*;
public class FileOutputStreamWrite7 {
 public static void main(String[] args) {
         File file=null;
          FileInputStream fin=null;
          FileOutputStream fout=null;
          Scanner sc= null;    // TODO Auto-generated method stub
 try {
     // creating a file
    file = new File("./Write.txt");
    file.createNewFile();
    //taking input from the user
    sc= new  Scanner(System.in);
    System.out.print("Enter a  byte to write into a file");
    byte     a= sc.nextByte();
    System.out.println("you enter  byte successfully");
    // write byte's into file
    fout= new FileOutputStream(file);
    fout.write(a);
    //reading a byte's that are stored into a file
    fin= new FileInputStream(file);
    int read;
    System.out.print(" convert a byte into a character that is  enter by the user is ---> ");
    while((read=fin.read())!=-1)    
    {    System.out.print("  "+(char)read+"  ");
    }}
       catch(Exception e)
 {System.out.println(" Sorry invalid input  "+e);
      }}}

Output:

Enter  byte to write into a file
34
you enter  byte successfully
 convert a byte into a character that is

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