Java.io.DataInputStream.readUnsignedByte() Method

Description

The java.io.DataInputStream.readUnsignedByte() method returns result which is in the range of 0-255.

Declaration

Following is the declaration for java.io.DataInputStream.readUnsignedByte() method:

public final int readUnsignedByte()

Parameters

• NA

Return Value

This method returns unsigned 8 bit value.

Exception

• IOException --

  If the stream is closed or the or any I/O error occurs.

• EOFException --

  If the input stream has reached the ends.

Example

The following example shows the usage of java.io.DataInputStream.readUnsignedByte() 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 DataInputStreamDemo {
   public static void main(String[] args) throws IOException {
         
      InputStream is = null;
      DataInputStream dis = null;
      FileOutputStream fos = null;
      DataOutputStream dos = null;
      byte[] b = {-124,126};
      
      try{
         // create file output stream
         fos = new FileOutputStream("c:\\test.txt");
           
         // create data output stream
         dos = new DataOutputStream(fos);
           
         // for each  byte in byte buffer
         for(byte j:b)
         {
            // write byte to data output stream
            dos.writeByte(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)
         {
            // returns unsigned 8-bit number
            int k = dis.readUnsignedByte();
            
            // print
            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:

132 126