Java.io.DataInputStream.readUTF() Method

Description

The java.io.DataInputStream.readUTF() method reads in a string that has been encoded using a modified UTF-8 format. The string of character is decoded from the UTF and returned as String.

Declaration

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

public final String readUTF()

Parameters

• NA

Return Value

This method returns a unicode string.

Exception

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

• EOFException -- If the input stream has reached the ends.

• UTFDataFormatException -- If the bytes do not represent a valid modified UTF-8 encoding.

Example

The following example shows the usage of java.io.DataInputStream.readUTF() 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;
      String[] s = {"Hello", "World!!"};
      
      try{
         // create file output stream
         fos = new FileOutputStream("c:\\test.txt");
           
         // create data output stream
         dos = new DataOutputStream(fos);
           
         // for each  string in string buffer
         for(String j:s)
         {
            // write string encoded as modified UTF-8
            dos.writeUTF(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)
         {
            // reads characters encoded with modified UTF-8
            String k = dis.readUTF();
            
            // 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:

Hello World!!