ObjectOutput interface in Java

java.io.ObjectOutput

ObjectOutput extends the DataOutput interface to include the writing of objects.DataOutput includes methods for output of primitive types, ObjectOutputextends that interface to include objects, arrays, and Strings.

Super Interfaces:

AutoCloseable, DataOutput

Implementing Classes:

ObjectOutputStream

Declaration

public interface ObjectOutput extends 
                  DataOutput, AutoCloseable {

        public void writeObject(Object obj) throws IOException;

        public void write(int b) throws IOException;

        public void write(byte b[]) throws IOException;

        public void write(byte b[], int off, int len)
                                   throws IOException;

        public void flush() throws IOException;

        public void close() throws IOException;
    }

Methods of ObjectOutput

1. writeObject(Object obj

void java.io.ObjectOutput.writeObject(Object obj) throws IOException

Write an object to the underlying storage or stream. The class that implements this interface defines how the object is written.

Parameters: obj the object to be written.

Throws:

IOException - Any of the usual Input/Output related exceptions.

2. write(int b)

void java.io.ObjectOutput.write(int b) throws IOException

Writes a byte. This method will block until the byte is actually written.

Parameters:

b: the byte.

Throws:

IOException - If an I/O error has occurred.

3. write(byte[] b)

void java.io.ObjectOutput.write(byte[] b) throws IOException

Writes an array of bytes. This method will block until the bytes are actually written.

Parameters:

b: the data to be written.

Throws:

IOException - If an I/O error has occurred.

4. write(byte[] b, int off, int len)

void java.io.ObjectOutput.write(byte[] b, int off, int len) throws IOException

Writes a sub array of bytes.

Parameters:

b: the data to be written.

off: the start offset in the data.

len: the number of bytes that are written.

Throws:

IOException - If an I/O error has occurred.

5. flush()

void java.io.ObjectOutput.flush() throws IOException

Flushes the stream. This will write any buffered output bytes.

Throws:

IOException - If an I/O error has occurred.

6. close()

void java.io.ObjectOutput.close() throws IOException

Closes the stream. This method must be called to release any resources associated with the stream.

Throws:

IOException - If an I/O error has occurred.

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