ObjectOutput

AI-generated Key Takeaways

• The ObjectOutput interface defines methods for writing serialized objects to a stream.

• It extends DataOutput and AutoCloseable, inheriting methods for writing various data types and closing the stream.

• Key methods include writeObject for writing objects, write for writing byte arrays and primitives, and close for closing the stream.

• ObjectOutputStream is a known indirect subclass that implements this interface for writing objects to an output stream.

public interface ObjectOutput implements DataOutput AutoCloseable

Known Indirect Subclasses ObjectOutputStream ObjectOutputStream An ObjectOutputStream writes primitive data types and graphs of Java objects to an OutputStream.

Defines an interface for classes that allow reading serialized objects.

See Also

• ObjectOutputStream
• ObjectInput

Public Method Summary

abstract void	close() Closes the target stream.
abstract void	flush() Flushes the target stream.
abstract void	write(byte[] buffer) Writes the entire contents of the byte array buffer to the output stream.
abstract void	write(byte[] buffer, int offset, int count) Writes count bytes from the byte array buffer starting at position offset to the target stream.
abstract void	write(int value) Writes a single byte to the target stream.
abstract void	writeObject(Object obj) Writes the specified object obj to the target stream.

Inherited Method Summary

From interface java.io.DataOutput

abstract void	write(byte[] b) Writes to the output stream all the bytes in array b.
abstract void	write(byte[] b, int off, int len) Writes len bytes from array b, in order, to the output stream.
abstract void	write(int b) Writes to the output stream the eight low-order bits of the argument b.
abstract void	writeBoolean(boolean v) Writes a boolean value to this output stream.
abstract void	writeByte(int v) Writes to the output stream the eight low- order bits of the argument v.
abstract void	writeBytes(String s) Writes a string to the output stream.
abstract void	writeChar(int v) Writes a char value, which is comprised of two bytes, to the output stream.
abstract void	writeChars(String s) Writes every character in the string s, to the output stream, in order, two bytes per character.
abstract void	writeDouble(double v) Writes a double value, which is comprised of eight bytes, to the output stream.
abstract void	writeFloat(float v) Writes a float value, which is comprised of four bytes, to the output stream.
abstract void	writeInt(int v) Writes an int value, which is comprised of four bytes, to the output stream.
abstract void	writeLong(long v) Writes a long value, which is comprised of eight bytes, to the output stream.
abstract void	writeShort(int v) Writes two bytes to the output stream to represent the value of the argument.
abstract void	writeUTF(String s) Writes two bytes of length information to the output stream, followed by the modified UTF-8 representation of every character in the string s.

From interface java.lang.AutoCloseable

abstract void

close() Closes this resource, relinquishing any underlying resources.

Public Methods

public abstract void close ()

Closes the target stream. Implementations of this method should free any resources used by the stream.

Throws

IOException	if an error occurs while closing the target stream.

public abstract void flush ()

Flushes the target stream. Implementations of this method should ensure that any pending writes are written out to the target stream.

Throws

IOException	if an error occurs while flushing the target stream.

public abstract void write (byte[] buffer)

Writes the entire contents of the byte array buffer to the output stream. Blocks until all bytes are written.

Parameters

buffer	the buffer to write.

Throws

IOException	if an error occurs while writing to the target stream.

public abstract void write (byte[] buffer, int offset, int count)

Writes count bytes from the byte array buffer starting at position offset to the target stream. Blocks until all bytes are written.

Parameters

buffer	the buffer to write.
offset	the index of the first byte in buffer to write.
count	the number of bytes from buffer to write to the target stream.

Throws

IOException	if an error occurs while writing to the target stream.

public abstract void write (int value)

Writes a single byte to the target stream. Only the least significant byte of the integer value is written to the stream. Blocks until the byte is actually written.

Parameters

value	the byte to write.

Throws

IOException	if an error occurs while writing to the target stream.

public abstract void writeObject (Object obj)

Writes the specified object obj to the target stream.

Parameters

obj	the object to write.

Throws

IOException	if an error occurs while writing to the target stream.