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package java.lang;
import java.io.IOException;
/**
* An object to which char sequences and values can be appended. The
* Appendable interface must be implemented by any class whose
* instances are intended to receive formatted output from a {@link
* java.util.Formatter}.
*
* The characters to be appended should be valid Unicode characters as
* described in Unicode Character
* Representation. Note that supplementary characters may be composed of
* multiple 16-bit char values.
*
*
Appendables are not necessarily safe for multithreaded access. Thread
* safety is the responsibility of classes that extend and implement this
* interface.
*
*
Since this interface may be implemented by existing classes
* with different styles of error handling there is no guarantee that
* errors will be propagated to the invoker.
*
* @since 1.5
*/
public interface Appendable
{
/**
* Appends the specified character sequence to this Appendable.
*
*
Depending on which class implements the character sequence
* csq, the entire sequence may not be appended. For
* instance, if csq is a {@link java.nio.CharBuffer} then
* the subsequence to append is defined by the buffer's position and limit.
*
* @param csq
* The character sequence to append. If csq is
* null, then the four characters "null" are
* appended to this Appendable.
*
* @return A reference to this Appendable
*
* @throws IOException
* If an I/O error occurs
*/
Appendable append(CharSequence csq) throws IOException;
/**
* Appends a subsequence of the specified character sequence to this
* Appendable.
*
*
An invocation of this method of the form out.append(csq, start,
* end) when csq is not null, behaves in
* exactly the same way as the invocation
*
*
* out.append(csq.subSequence(start, end))
*
* @param csq
* The character sequence from which a subsequence will be
* appended. If csq is null, then characters
* will be appended as if csq contained the four
* characters "null".
*
* @param start
* The index of the first character in the subsequence
*
* @param end
* The index of the character following the last character in the
* subsequence
*
* @return A reference to this Appendable
*
* @throws IndexOutOfBoundsException
* If start or end are negative, start
* is greater than end, or end is greater than
* csq.length()
*
* @throws IOException
* If an I/O error occurs
*/
Appendable append(CharSequence csq, int start, int end) throws IOException;
/**
* Appends the specified character to this Appendable.
*
* @param c
* The character to append
*
* @return A reference to this Appendable
*
* @throws IOException
* If an I/O error occurs
*/
Appendable append(char c) throws IOException;
}