an important method for a good storage of couple inside a set . this method is used by the equals method to compare two couples . concode_field_sep double prob concode_elem_sep int freq concode_elem_sep String first concode_elem_sep String second concode_field_sep int getFreq concode_elem_sep String getFirst concode_elem_sep boolean equals concode_elem_sep String getSecond concode_elem_sep void setProb concode_elem_sep String toString concode_elem_sep int compareTo concode_elem_sep int incFreq concode_elem_sep double getProb
int function ( ) { return 3 * first . hashCode ( ) + 5 * second . hashCode ( ) + 7 * freq ; }