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Java File Binary
Posted on: April 14, 2006 at 12:00 AM
In this section, you will learn how to write numeric data into the binary file.

Java File Binary

In this section, you will learn how to write numeric data into the binary file.

Description of code:

Numeric data converts compactly and faster in a binary format than the text. In the given example, at first, we have created two arrays, integer and double type. Then we have opened the FileOutputStream and specify the file to create. This stream is then wrapped with an instance of DataOutputStream which contains several useful methods for writing primitive data into the file.

Here is the code:

import java.io.*;

public class JavaFileBinary {
	public static void main(String arg[]) throws Exception {
		int[] arr1 = { 1, 2, 3, 4, 5 };
		double[] arr2 = { 1.5, 2.5, 3.5, 4.5, 5.5 };
		File file = new File("C:/student.dat");
		FileOutputStream fos = new FileOutputStream(file);
		DataOutputStream dos = new DataOutputStream(fos);
		for (int i = 0; i < arr1.length; i++) {

In the above code, the methods writeInt (int i) and the writeDouble (double d) of class DataOutputStream methods provides the way to write the data to the file.


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Posted on: April 14, 2006

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