public synchronized StringBuffer insert(int index, CharSequence s) {insert0(index, s == null ? "null" : s.toString());return this;}

public synchronized StringBuffer insert ( int index , CharSequence s ) { insert0 ( index , s == null ? "null" : s . toString ( ) ) ; return this ; }
public java.lang.StringBuffer insert(int index, char[] chars){lock (this){insert0(index, chars);return this;}}
