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Java ObjectOutputStream writeInt() Method with Example

ObjectOutputStream Class writeInt() method: Here, we are going to learn about the writeInt() method of ObjectOutputStream Class with its syntax and example.
Submitted by Preeti Jain, on April 10, 2020

ObjectOutputStream Class writeInt() method

  • writeInt() method is available in java.io package.
  • writeInt() method is used to write the given 4 bytes of an integer value.
  • 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 when getting any input/output error while writing to the output stream.


    public void writeInt(int value);


  • int value – represents the integer value to be written.

Return value:

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


// Java program to demonstrate the example 
// of void writeInt(int value) method of 
// ObjectOutputStream

import java.io.*;

public class WriteIntOfOOS {
 public static void main(String[] args) throws Exception {
  // Instantiates ObjectOutputStream , ObjectInputStream 
  // FileInputStream and FileOutputStream
  FileOutputStream file_out_stm = new FileOutputStream("D:\\includehelp.txt");
  ObjectOutputStream obj_out_stm = new ObjectOutputStream(file_out_stm);
  FileInputStream file_in_stm = new FileInputStream("D:\\includehelp.txt");
  ObjectInputStream obj_in_stm = new ObjectInputStream(file_in_stm);

  // By using writeInt() method is to
  // write the int to the stream		


  // By using readInt() method is to 
  // read the int
  for (int i = 0; i < 4; ++i) {
   int in = obj_in_stm.readInt();
   System.out.println("obj_in_stm.readInt(): " + in );

  // By using close() method is to 
  // close all the streams 
  System.out.println("Stream Shutdown... ");



obj_in_stm.readInt(): 100
obj_in_stm.readInt(): 200
obj_in_stm.readInt(): 300
obj_in_stm.readInt(): 400
Stream Shutdown... 

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