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Java DataOutputStream writeInt() Method with Example

DataOutputStream Class writeInt() method: Here, we are going to learn about the writeInt() method of DataOutputStream Class with its syntax and example.
Submitted by Preeti Jain, on March 30, 2020

DataOutputStream Class writeInt() method

• writeInt() method is available in java.io package.
• writeInt() method is used to write the given integer value to the basic DataOutputStream as 4 bytes (i.e. 32 bit) and the variable counter is plus by 4 on successful execution.
• writeInt() method is a non-static method, it is accessible with the class object only and if we try to access the method with the class name then we will get an error.
• writeInt() method may throw an exception at the time of writing an integer.
  IOException: This exception may throw while getting any input/output error.

Syntax:

    public final void writeInt(int val);

Parameter(s):

• int val – represents the integer value to be written to the data output stream.

Return value:

The return type of the method is void, it returns nothing.

Example:

// Java program to demonstrate the example 
// of void writeInt(int val) method 
// of DataOutputStream

import java.io.*;

public class WriteIntOfDOS {
 public static void main(String[] args) throws Exception {
  InputStream is_stm = null;
  DataInputStream dis_stm = null;
  FileOutputStream fos_stm = null;
  DataOutputStream dos_stm = null;

  int[] in = {
   10,
   20,
   30,
   40,
   50
  };

  try {
   // Instantiate FileInputStream, 
   // DataInputStream, FileOutputStream
   // and DataOutputStream 
   fos_stm = new FileOutputStream("C:\\Users\\Preeti Jain\\Desktop\\programs\\includehelp.txt");
   dos_stm = new DataOutputStream(fos_stm);

   is_stm = new FileInputStream("C:\\Users\\Preeti Jain\\Desktop\\programs\\includehelp.txt");
   dis_stm = new DataInputStream(is_stm);


   for (int val: in ) {
    // By using writeInt() method isto
    // write int value to the
    // DataOutputStream dos_stm
    dos_stm.writeInt(val);
   }

   // By using flush() method isto
   // flush the bytes to the basic 
   // output stream         
   dos_stm.flush();

   // Loop To Read Available Data till end
   while (dis_stm.available() > 0) {
    // By using readInt() method isto read 
    // int from dis_stm
    int val = dis_stm.readInt();
    System.out.println("dos_stm.writeInt(val): " + val);
   }
  } catch (Exception ex) {
   System.out.println(ex.toString());
  } finally {
   // To free system resources linked
   // with these streams
   if (is_stm != null)
    is_stm.close();

   if (dis_stm != null)
    dis_stm.close();

   if (dos_stm != null)
    dos_stm.close();

   if (fos_stm != null)
    fos_stm.close();
  }
 }
}

Output

dos_stm.writeInt(val): 10
dos_stm.writeInt(val): 20
dos_stm.writeInt(val): 30
dos_stm.writeInt(val): 40
dos_stm.writeInt(val): 50