public java.lang.StringBuilder deleteCharAt(int index){
  int length=count - index - 1;
  if (length > 0) {
    System.arraycopy(value,index + 1,value,index,length);
  }
  count--;
  return this;
}

public java . lang . StringBuilder deleteCharAt ( int index ) { int length = count - index - 1 ; if ( length > 0 ) { System . arraycopy ( value , index + 1 , value , index , length ) ; } count -- ; return this ; }
removes the character at the specified position in this stringbuffer ( shortening the stringbuffer by one character ) .
