DataInputStrem, DataOutputStream in Java Example

When you need to process primitive types, Java provides DatalnputStream and DataOutputStream classes.

The DatalnputStream class is a subclass of FilterlnputStream that reads bytes from a stream and converts them into appropriate primitive type values or strings.

The DatalnputStream class implements the Datalnput interface that defines the methods for reading primitive types values or strings from a byte input stream.

import java.io.*; 
 class DataIOStreamExample 
 { 
     public static void main(String[] args) 
    { 
        try 
       { 
           
           FileOutputStream fin=new FileOutputStream ("Std.dat"); 
           DataOutputStream din = new DataOutputStream(fin); 
           din.writeInt(101); 
           din.writeUTF("Dinesh Thakur"); 
           din.writeDouble(99.5); 
           din.writeLong(98765432); 
           din.close(); 
        } 
           catch(IOException e)  { e.printStackTrace();}  
        try 
       { 
           FileInputStream fin=new FileInputStream("std.dat"); 
           DataInputStream din=new DataInputStream(fin); 
           System.out.println("Roll Number : " + din.readInt()); 
           System.out.println("Name : "+din.readUTF());       
           System.out.println("Percentage : "+ din.readDouble()); 
           System.out.println("Phone Number :"+  din.readLong()); 
           din.close(); 
        } 
           catch(IOException e)  { e.printStackTrace(); } 
     } 
 }