public StringBuilder(int length){
  if (length < 0) {
    throw new NegativeArraySizeException(Integer.toString(length));
  }
  value=new char[length];
}

public StringBuilder ( int length ) { if ( length < 0 ) { throw new NegativeArraySizeException ( Integer . toString ( length ) ) ; } value = new char [ length ] ; }
constructs a string buffer with no characters in it and an initial capacity specified by the length argument . length - the initial capacity . - if the length argument is less than 0 .
