Interface Appendable
- All Known Implementing Classes:
-
BufferedWriter
,CharArrayWriter
,CharBuffer
,FileWriter
,FilterWriter
,LogStream
,OutputStreamWriter
,PipedWriter
,PrintStream
,PrintWriter
,StringBuffer
,StringBuilder
,StringWriter
,Writer
public interface Appendable
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 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
Methods
Modifier and Type | Method | Description |
---|---|---|
Appendable | append(char c) | Appends the specified character to this |
Appendable | append(CharSequence csq) | Appends the specified character sequence to this |
Appendable | append(CharSequence csq,
int start,
int end) | Appends a subsequence of the specified character sequence to this |
Methods
append
Appendable append(CharSequence csq) throws IOException
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 CharBuffer
then the subsequence to append is defined by the buffer's position and limit.
- Parameters:
-
csq
- The character sequence to append. Ifcsq
isnull
, then the four characters"null"
are appended to this Appendable. - Returns:
- A reference to this
Appendable
- Throws:
-
IOException
- If an I/O error occurs
append
Appendable append(CharSequence csq, int start, int end) 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))
- Parameters:
-
csq
- The character sequence from which a subsequence will be appended. Ifcsq
isnull
, then characters will be appended as ifcsq
contained the four characters"null"
. -
start
- The index of the first character in the subsequence -
end
- The index of the character following the last character in the subsequence - Returns:
- A reference to this
Appendable
- Throws:
-
IndexOutOfBoundsException
- Ifstart
orend
are negative,start
is greater thanend
, orend
is greater thancsq.length()
-
IOException
- If an I/O error occurs
append
Appendable append(char c) throws IOException
Appends the specified character to this Appendable
.
- Parameters:
-
c
- The character to append - Returns:
- A reference to this
Appendable
- Throws:
-
IOException
- If an I/O error occurs
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Documentation extracted from Debian's OpenJDK Development Kit package.
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https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/Appendable.html