Added in API level 1

Appendable

public interface Appendable

java.lang.Appendable
BufferedWriter Writes text to a character-output stream, buffering characters so as to provide for the efficient writing of single characters, arrays, and strings. 
CharArrayWriter This class implements a character buffer that can be used as an Writer. 
CharBuffer A char buffer. 
Editable This is the interface for text whose content and markup can be changed (as opposed to immutable text like Strings). 
FileWriter Writes text to character files using a default buffer size. 
FilterWriter Abstract class for writing filtered character streams. 
OutputStreamWriter An OutputStreamWriter is a bridge from character streams to byte streams: Characters written to it are encoded into bytes using a specified charset
PipedWriter Piped character-output streams. 
PrintStream A PrintStream adds functionality to another output stream, namely the ability to print representations of various data values conveniently. 
PrintWriter Prints formatted representations of objects to a text-output stream. 
SpannableStringBuilder This is the class for text whose content and markup can both be changed. 
StringBuffer A thread-safe, mutable sequence of characters. 
StringBuilder A mutable sequence of characters. 
StringWriter A character stream that collects its output in a string buffer, which can then be used to construct a string. 
Writer Abstract class for writing to character streams. 


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.

Summary

Public methods

abstract Appendable append(char c)

Appends the specified character to this Appendable.

abstract Appendable append(CharSequence csq, int start, int end)

Appends a subsequence of the specified character sequence to this Appendable.

abstract Appendable append(CharSequence csq)

Appends the specified character sequence to this Appendable.

Public methods

append

Added in API level 1
public abstract Appendable append (char c)

Appends the specified character to this Appendable.

Parameters
c char: The character to append

Returns
Appendable A reference to this Appendable

Throws
IOException If an I/O error occurs

append

Added in API level 1
public abstract Appendable append (CharSequence csq, 
                int start, 
                int end)

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 CharSequence: 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".

start int: The index of the first character in the subsequence

end int: The index of the character following the last character in the subsequence

Returns
Appendable 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()
IOException If an I/O error occurs

append

Added in API level 1
public abstract Appendable append (CharSequence csq)

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 CharSequence: The character sequence to append. If csq is null, then the four characters "null" are appended to this Appendable.

Returns
Appendable A reference to this Appendable

Throws
IOException If an I/O error occurs