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1.8 The ObjectOutput Interface

The ObjectOutput interface provides an abstract, stream-based interface to object storage. It extends the DataOutput interface so those methods can be used for writing primitive data types. Objects that implement this interface can be used to store primitives and objects.

package java.io;

public interface ObjectOutput extends DataOutput
{
    public void writeObject(Object obj) throws IOException;
    public void write(int b) throws IOException;
    public void write(byte b[]) throws IOException;
     public void write(byte b[], int off, int len) throws IOException;
    public void flush() throws IOException;
    public void close() throws IOException;
}

The writeObject method is used to write an object. The exceptions thrown reflect errors while accessing the object or its fields, or exceptions that occur in writing to storage. If any exception is thrown, the underlying storage may be corrupted. If this occurs, refer to the object that is implementing this interface for more information.