Package java.lang

Interface Appendable

  • All Known Implementing Classes:
    OutputStreamWriter, PrintStream, StringBuffer, StringBuilder, Writer
    public interface Appendable
    An object to which char sequences and values can be appended.

    The characters to be appended should be valid Unicode characters. 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.

    • Method Detail

      • 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

      • append

        Appendable append​(@Nullable
                  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.

        Parameters:
        csq - The character sequence to append. If csq is null, 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​(@Nullable
                  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. If csq is null, then characters will be appended as if csq 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 - 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