Java ObjectInputStream readFully() Method with Examples

by Online Tutorials Library July 22, 2022

Java ObjectInputStream readFully() Method

The readFully() method of ObjectInputStream class is used to read bytes until all the bytes in the objectinputstream are completely read. It takes 3 parameters as the buffer to which the data is stored , from where to start reading, and how many bytes to read.

Syntax

  public void readFully(byte[] buf) throws IOException  public void readFully(byte[] buf, int off, int len) throws IOException  

Parameter

buf – the buffer into which the data is read

off – the start offset into the data array buf

len – the maximum number of bytes to read

Returns

Throws

NullPointerException – If buf is null.

IndexOutOfBoundsException – If off is negative, len is negative, or len is greater than buf.length – off.

EOFException – If end of file is reached.

IOException – If other I/O error has occurred.

Example 1

  import java.io.*;  public class ObjectInputStreamreadFullyExample1 {     public static void main(String[] args) {        String s = “welcome to TutorAspire “;        try {           // create a new file with an ObjectOutputStream           FileOutputStream outstream = new FileOutputStream(“file1.txt”);           ObjectOutputStream objoutstream = new ObjectOutputStream(outstream);             // write something in the file           objoutstream.writeUTF(s);           objoutstream.flush();             // create an ObjectInputStream for the file we created before           ObjectInputStream objinstream = new ObjectInputStream(new FileInputStream(“file1.txt”));             // read and print the whole content           byte[] bt = new byte[22];           objinstream.readFully(bt);           String arr = new String(bt);           System.out.println(“” + arr);        } catch (Exception ex) {           ex.printStackTrace();        }     }  }  

Output:

welcome to TutorAspire

Example 2

  import java.io.DataInputStream;  import java.io.DataOutputStream;  import java.io.FileInputStream;  import java.io.FileOutputStream;  import java.io.IOException;  import java.io.InputStream;  import java.io.ObjectInputStream;  import java.io.ObjectOutputStream;    public class ObjectInputStreamreadFullyExample2 {     public static void main(String[] args) throws IOException {        String s = “welcom to TutorAspire “;                try {           // create a new file with an ObjectOutputStream           FileOutputStream outstream = new FileOutputStream(“file1.txt”);           ObjectOutputStream objoutstream = new ObjectOutputStream(outstream);             // write something in the file           objoutstream.writeUTF(s);           objoutstream.flush();             // create an ObjectInputStream for the file we created before           ObjectInputStream objinstream = new ObjectInputStream(new FileInputStream(“file1.txt”));             // read and print the whole content           byte[] bt = new byte[22];          objinstream.readFully(bt, 10, 9);          String arr = new String(bt);                      System.out.println(“” + arr);                        }         catch (Exception ex) {           ex.printStackTrace();        }     }  }  

Output:

welcome

Next TopicJava ObjectInputStream

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