Java DataOutputStream Class

The DataOutputStream class in Java is used to write primitive data types to an output stream in a machine-independent format.

In this chapter, we will learn what the DataOutputStream class is, why it is used, its declaration, constructors, important methods, and how to write primitive data to a file using an example.

What is DataOutputStream in Java?

The DataOutputStream class allows a Java application to write primitive data types such as int, char, boolean, and String to an output stream in a portable way.

The data written using DataOutputStream can later be read correctly using a DataInputStream. This makes it useful when data needs to be shared between different systems or programs.

DataOutputStream Class Declaration

The following declaration shows how the DataOutputStream class is defined:

Constructors of DataOutputStream Class

The DataOutputStream class provides a constructor to create a data output stream.

1. DataOutputStream(OutputStream out)

This constructor creates a new DataOutputStream that writes data to the specified output stream.

Syntax:

Here is the syntax of this constructor:

Example of DataOutputStream Class Constructor

The following example demonstrates how to create a DataOutputStream using its constructor.

Methods of DataOutputStream Class

The DataOutputStream class provides methods to write primitive data types.

Example of Java DataOutputStream Class

This example demonstrates how to write primitive data to a file using the DataOutputStream class.

Output:

Succcess...

testout.txt:

A