Java.io.ObjectInputStream.readFully() Method

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Description

The java.io.ObjectInputStream.readFully(byte[] buf, int off, int len) method reads bytes, blocking until all bytes are read.

Declaration

Following is the declaration for java.io.ObjectInputStream.readFully() method.

public void readFully(byte[] buf)

Parameters

• buf − The buffer into which the data is read.

• off − The start offset of the data.

• len − The maximum number of bytes to read.

Return Value

This method does not return a value.

Exception

• EOFException − If end of file is reached.

• IOException − If an I/O error has occurred.

Example

The following example shows the usage of java.io.ObjectInputStream.readFully() method.

package com.tutorialspoint;

import java.io.*;

public class ObjectInputStreamDemo {
   public static void main(String[] args) {
      String s = "Hello World";
      
      try {
         // create a new file with an ObjectOutputStream
         FileOutputStream out = new FileOutputStream("test.txt");
         ObjectOutputStream oout = new ObjectOutputStream(out);

         // write something in the file
         oout.writeUTF(s);
         oout.flush();

         // create an ObjectInputStream for the file we created before
         ObjectInputStream ois = new ObjectInputStream(new FileInputStream("test.txt"));

         // read and print from index 0 to 7
         byte[] b = new byte[13];
         ois.readFully(b, 0, 7);
         String array = new String(b);
         System.out.println("" + array);
      } catch (Exception ex) {
         ex.printStackTrace();
      }
   }
}

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

Hello