Java.io.DataInputStream.readByte() Method

Description

The java.io.DataInputStream.readByte() method read and returns one single input byte. The byte is a signed value in the range -128 to 127.

Declaration

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

public final byte readByte()

Parameters

• NA

Return Value

The byte value read.

Exception

• IOException -- if the stream is closed, or any I/O error occurs.

• EOFException -- if the input stream has reached the end.

Example

The following example shows the usage of java.io.DataInputStream.readByte() method.

package com.tutorialspoint;

import java.io.ByteArrayInputStream;
import java.io.DataInputStream;
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;
      byte[] buf = {65, 0, 0, 68, 69};
      
      try{
         
         // create new byte array input stream
         is = new ByteArrayInputStream(buf);
         
         // create data input stream
         dis = new DataInputStream(is);
         
         // readBoolean till the data available to read
         while( dis.available() >0)
         {
            // read one single byte
            byte b = dis.readByte();
            
            // print the byte
            System.out.print(b+" ");
         }
      }catch(Exception e){
         // if any I/O error occurs
         e.printStackTrace();
      }finally{
         
         // releases any associated system files with this stream
         if(is!=null)
            is.close();
         if(dis!=null)
            dis.close();
      }   
   }
}

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

65 0 0 68 69