Interface ObjectInput
- 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:
-
Method Summary
Modifier and TypeMethodDescriptionint
Returns the number of bytes that can be read without blocking.void
close()
Closes the input stream.int
read()
Reads a byte of data.int
read
(byte[] b) 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
skip
(long n) Skips n bytes of input.Methods inherited from interface java.io.DataInput
readBoolean, readByte, readChar, readDouble, readFloat, readFully, readFully, readInt, readLine, readLong, readShort, readUnsignedByte, readUnsignedShort, readUTF, skipBytes
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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
Reads into an array of bytes. This method will block until some input is available.- Parameters:
b
- the buffer into which the data is readoff
- the start offset of the datalen
- 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
- Ifoff
is negative,len
is negative, orlen
is greater thanb.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 interfaceAutoCloseable
- Throws:
IOException
- If an I/O error has occurred.
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