Interface java.io.ObjectInput - JDK 5 Documentation v1.1.8, Java 2 SDK 英文文档

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Interface java.io.ObjectInput

public interface ObjectInput
extends DataInput

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.

See Also:: InputStream, ObjectOutputStream, ObjectInputStream

available(): Returns the number of bytes that can be read without blocking.
close(): Closes the input stream.
read(): Reads a byte of data.
read(byte[]): Reads into an array of bytes.
read(byte[], int, int): Reads into an array of bytes.
readObject(): Read and return an object.
skip(long): Skips n bytes of input.

readObject

 public abstract Object readObject() throws ClassNotFoundException, IOException

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

Throws: ClassNotFoundException: If the class of a serialized object cannot be found.
Throws: IOException: If any of the usual Input/Output related exceptions occur.

read

 public abstract int read() throws IOException

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

 public abstract int read(byte b[]) 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
Returns:: the actual number of bytes read, -1 is returned when the end of the stream is reached.
Throws: IOException: If an I/O error has occurred.

read

 public abstract 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 actual number of bytes read, -1 is returned when the end of the stream is reached.
Throws: IOException: If an I/O error has occurred.

skip

 public abstract long skip(long n) throws IOException

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

 public abstract int available() throws IOException

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

Returns:: the number of available bytes.

close

 public abstract void close() throws IOException

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

Throws: IOException: If an I/O error has occurred.

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