Java.io.DataOutputStream.writeInt() Method

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Description

The java.io.DataOuputStream.writeInt(int v) method writes a int value to the to the underlying stream as four bytes. The counter written is incremented by 4 on successful invocation of this method.

Declaration

Following is the declaration for java.io.DataOutputStream.writeInt(int v) method −

public final void writeInt(int v)

Parameters

v − an int value to be written to the output stream.

Return Value

This method does not return any value.

Exception

IOException − If an I/O error occurs.

Example

The following example shows the usage of java.io.DataOutputStream.writeInt(int v) method.

package com.tutorialspoint;

import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;

public class DataOutputStreamDemo {
   public static void main(String[] args) throws IOException {
      InputStream is = null;
      DataInputStream dis = null;
      FileOutputStream fos = null;
      DataOutputStream dos = null;
      int[] i = {128,250,430,520,820};
      
      try {
         // create file output stream
         fos = new FileOutputStream("c:\\test.txt");
           
         // create data output stream
         dos = new DataOutputStream(fos);
           
         // for each int in int buffer
         for(int j:i) {
         
            // write int to data output stream
            dos.writeInt(j);
         }
           
         // force data to the underlying file output stream
         dos.flush();
         
         // create file input stream
         is = new FileInputStream("c:\\test.txt");
         
         // create new data input stream
         dis = new DataInputStream(is);
         
         // available stream to be read
         while(dis.available()>0) {
         
            // read four bytes from data input, return int
            int k = dis.readInt();
            
            // print int
            System.out.print(k+" ");
         }
         
      } catch(Exception e) {
         // if any error occurs
         e.printStackTrace();
      } finally {
         // releases all system resources from the streams
         if(is!=null)
            is.close();
         if(dis!=null)
            dis.close();
         if(fos!=null)
            fos.close();
         if(dos!=null)
            dos.close();
      }
   }
}

Let us compile and run the above program, this will produce the following result −

128 250 430 520 820