Java.io.OutputStream class in Java

Java.io.OutputStream class in Java

Last Updated : 12 Sep, 2023

This abstract class is the superclass of all classes representing an output stream of bytes. An output stream accepts output bytes and sends them to some sink. Applications that need to define a subclass of OutputStream must always provide at least a method that writes one byte of output. Constructor and Description

OutputStream() : Single Constructor

Methods:

void close() : Closes this output stream and releases any system resources associated with this stream.
```
Syntax :public void close()
           throws IOException
Throws:
IOException
```
void flush() : Flushes this output stream and forces any buffered output bytes to be written out.
```
Syntax :public void flush()
           throws IOException
Throws:
IOException
```

void write(byte[] b) : Writes b.length bytes from the specified byte array to this output stream.

Syntax :public void write(byte[] b)
           throws IOException
Parameters:
b - the data.
Throws:
IOException

void write(byte[] b, int off, int len) : Writes len bytes from the specified byte array starting at offset off to this output stream.

Syntax :public void write(byte[] b,
         int off,
         int len)
           throws IOException
Parameters:
b - the data.
off - the start offset in the data.
len - the number of bytes to write.
Throws:
IOException

abstract void write(int b) : Writes the specified byte to this output stream.

Syntax :public abstract void write(int b)
                    throws IOException
Parameters:
b - the byte.
Throws:
IOException

Java

import java.io.*;
//Java program to demonstrate OutputStream
class OutputStreamDemo
{
    public static void main(String args[])throws Exception
    {
        OutputStream os = new FileOutputStream("file.txt");
        byte b[] = {65, 66, 67, 68, 69, 70};
        
        //illustrating write(byte[] b) method
        os.write(b);
        
        //illustrating flush() method
        os.flush();

        //illustrating write(int b) method
        for (int i = 71; i <75 ; i++) 
        {
            os.write(i);
        }
        
        os.flush();
        
        //close the stream
        os.close();
    }
}

Output :

ABCDEFGHIJ

Java.io.OutputStream class in Java

N

Nishant Sharma

Improve

Article Tags :

Java

Practice Tags :

Java

Similar Reads

Java.io.PipedInputStream class in Java

Pipes in IO provides a link between two threads running in JVM at the same time. So, Pipes are used both as source or destination. PipedInputStream is also piped with PipedOutputStream. So, data can be written using PipedOutputStream and can be written using PipedInputStream.But, using both threads

Java.io.ObjectOutputStream Class in Java | Set 1

An ObjectOutputStream writes primitive data types and graphs of Java objects to an OutputStream. The objects can be read (reconstituted) using an ObjectInputStream. Persistent storage of objects can be accomplished by using a file for the stream. Only objects that support the java.io.Serializable in

Java.io.PushbackInputStream class in Java

Pushback is used on an input stream to allow a byte to be read and then returned (i.e, "pushed back") to the stream. The PushbackInputStream class implements this idea. It provides a mechanism "peek" at what is coming from an input stream without disrupting it. It extends FilterInputStream.Fields: p

Java.io.ObjectInputStream Class in Java | Set 1

ObjectInputStream Class deserializes the primitive data and objects previously written by ObjectOutputStream. Both ObjectOutputStream and ObjectInputStream are used as it provides storage for graphs of object.It ensures that the object it is working for, matches the classes of JVM i.e Java Virtual M

Java.io.ObjectInputStream Class in Java | Set 2

Java.io.ObjectInputStream Class in Java | Set 1 Note : Java codes mentioned in this article won't run on Online IDE as the file used in the code doesn't exists online. So, to verify the working of the codes, you can copy them to your System and can run it over there. More Methods of ObjectInputStrea

Java.io.Printstream Class in Java | Set 2

Java.io.Printstream Class in Java | Set 1More Methods: PrintStream printf(Locale l, String format, Object... args) : A convenience method to write a formatted string to this output stream using the specified format string and arguments. Syntax :public PrintStream printf(Locale l, String format, Obje

Java.io.Printstream Class in Java | Set 1

A PrintStream adds functionality to another output stream, namely the ability to print representations of various data values conveniently. Unlike other output streams, a PrintStream never throws an IOException; instead, exceptional situations merely set an internal flag that can be tested via the c

Java.io.OutputStreamWriter Class

In Java, OutputStreamWriter class connects character streams to byte streams. It encodes Characters into bytes using a specified charset. Declaration of Java OutputStreamWriter Class public class OutputStreamWriter extends WriterConstructors of OutputStreamWriter Class in JavaConstructors in OutputS

Java.io.StringReader class in Java

StringReader class in Java is a character stream class whose source is a string. It inherits Reader Class. Closing the StringReader is not necessary, it is because system resources like network sockets and files are not used. Let us check more points about StringReader Class in Java. Declare StringR

Java.io.Writer class in Java

This abstract class for writing to character streams. The only methods that a subclass must implement are write(char[], int, int), flush(), and close(). Most subclasses, however, will override some of the methods defined here in order to provide higher efficiency, additional functionality, or both.