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Showing content from https://docs.oracle.com/en/java/javase/21/docs/api/java.base/java/io/ObjectInput.html below:

ObjectInput (Java SE 21 & JDK 21)

All Superinterfaces:

AutoCloseable, DataInput

All Known Implementing Classes:

ObjectInputStream

ObjectInput extends the DataInput interface to include the reading of objects. DataInput includes methods for the input of primitive types, ObjectInput extends that interface to include objects, arrays, and Strings.

Since:

1.1

See Also:

• InputStream
• ObjectOutputStream
• ObjectInputStream

• Method Summary

  int

  Returns the number of bytes that can be read without blocking.

  void

  int

  int

  Reads into an array of bytes.

  int

  read(byte[] b, int off, int len)

  Reads into an array of bytes.

  Read and return an object.

  long

  Methods declared in interface java.io.DataInputreadBoolean, readByte, readChar, readDouble, readFloat, readFully, readFully, readInt, readLine, readLong, readShort, readUnsignedByte, readUnsignedShort, readUTF, skipBytes

• Method Details
  • readObject

    Read and return an object. The class that implements this interface defines where the object is "read" from.

    Returns:

    the object read from the stream

    Throws:

    ClassNotFoundException - If the class of a serialized object cannot be found.

    IOException - If any of the usual Input/Output related exceptions occur.

  • read

    Reads a byte of data. This method will block if no input is available.

    Returns:

    the byte read, or -1 if the end of the stream is reached.

    Throws:

    IOException - If an I/O error has occurred.

  • read

    Reads into an array of bytes. This method will block until some input is available.

    Parameters:

    b - the buffer into which the data is read

    Returns:

    the total number of bytes read into the buffer, or -1 if there is no more data because the end of the stream has been reached.

    Throws:

    IOException - If an I/O error has occurred.

  • read int read(byte[] b, int off, int len)

    throws

    IOException

    Reads into an array of bytes. This method will block until some input is available.

    Parameters:

    b - the buffer into which the data is read

    off - the start offset of the data

    len - the maximum number of bytes read

    Returns:

    the total number of bytes read into the buffer, or -1 if there is no more data because the end of the stream has been reached.

    Throws:

    IOException - If an I/O error has occurred.

    IndexOutOfBoundsException - If off is negative, len is negative, or len is greater than b.length - off

  • skip

    Skips n bytes of input.

    Parameters:

    n - the number of bytes to be skipped

    Returns:

    the actual number of bytes skipped.

    Throws:

    IOException - If an I/O error has occurred.

  • available

    Returns the number of bytes that can be read without blocking.

    Returns:

    the number of available bytes.

    Throws:

    IOException - If an I/O error has occurred.

  • close

    Closes the input stream. Must be called to release any resources associated with the stream.

    Specified by:

    close in interface AutoCloseable

    Throws:

    IOException - If an I/O error has occurred.

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