public synchronized StringBuffer append(CharSequence s) {if (s == null) {appendNull();} else {append0(s, 0, s.length());}return this;}

public synchronized StringBuffer append ( CharSequence s ) { if ( s == null ) { appendNull ( ) ; } else { append0 ( s , 0 , s . length ( ) ) ; } return this ; }
public java.lang.StringBuffer append(char[] chars){lock (this){append0(chars);return this;}}
