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JDK 5 Documentation v1.1.8, Java 2 SDK 英文文档
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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