Java OutputStream Class

August 4, 2023

OutStream Class

In the Article, we will Discuss about the OutStream class of java.
In Java, The OutputStream class is an abstract class that serves as the superclass for all classes representing an output stream of bytes.

Java OutStream Class:

The OutputStream class in Java is an abstract class that serves as the superclass for all classes representing an output stream of bytes. It provides a common set of methods for writing data to different types of output destinations, such as files, network sockets, and other streams.

Some of the important methods of the OutputStream class are:

write(int b) Writes a single byte to the output stream. The byte to be written is specified as an integer argument b, which must be between 0 and 255.

write(byte[] b) Writes an array of bytes to the output stream. The bytes to be written are specified as a byte array argument b.

write(byte[] b, int off, int len) Writes a portion of an array of bytes to the output stream. The bytes to be written are specified as the byte array argument b, starting at offset off and continuing for len bytes.

flush() Flushes the output stream, forcing any buffered output bytes to be written out.

close() Closes the output stream, releasing any system resources associated with it.

Keywords and Variables

Initializing a FileOutStream object:

The syntax to initialize a FileOutputStream object in Java using the FileOutputStream class constructor is as follows:

Syntax

FileOutputStream fos = new FileOutputStream(String fileName);

In this syntax:

fos: is the object reference to the FileOutputStream object that is being created.
The String fileName parameter specifies the name of the file that the output stream should be associated with.

Run

import java.io.*;

public class FileOutputStreamExample {
    public static void main(String[] args) {
        try {
            FileOutputStream fos = new FileOutputStream("output.txt");
            // write data to the file using fos.write() method
            fos.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

Explanation:

In this example, we create a new FileOutputStream object to write to the file named output.txt. We can then use the write() method of the FileOutputStream class to write data to the file. Finally, we call the close() method to close the output stream when we are done writing data.

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