▁way . ▁Instead ▁of ▁defining ▁, ▁we ▁define ▁a ▁parameter ized ▁class ▁. ▁( One ▁draw back ▁of ▁this ▁is ▁that ▁the ▁implement er ▁of ▁the ▁base ▁class ▁needs ▁to ▁for ese e ▁which ▁types ▁will ▁need ▁to ▁be ▁special ized ▁in ▁the ▁sub classes .) ▁ ▁class ▁Sh elter < T ▁extends ▁Animal > ▁{ ▁▁▁▁▁ ▁T ▁get An imal For A do ption () ▁{ ▁▁▁▁▁▁▁▁ ▁// ▁... ▁▁▁▁ ▁} ▁▁▁▁▁ ▁void ▁put An imal ( T ▁animal ) ▁{ ▁▁▁▁▁▁▁▁ ▁// ▁... ▁▁▁▁ ▁} ▁} ▁▁▁▁▁▁ ▁class ▁Cat Sh elter ▁extends ▁Sh elter < Cat > ▁{ ▁▁▁▁▁ ▁Cat ▁get An imal For A do ption () ▁{ ▁▁▁▁▁▁▁▁ ▁// ▁... ▁▁▁▁ ▁} ▁▁▁▁▁ ▁void ▁put An imal ( Cat ▁animal ) ▁{ ▁▁▁▁▁▁▁▁ ▁// ▁... ▁▁▁▁ ▁} ▁} ▁ ▁Similarly , ▁in ▁recent ▁versions ▁of ▁Java ▁the ▁ ▁interface ▁has ▁been ▁parameter ized , ▁which ▁allows ▁the ▁down cast ▁to ▁be ▁omitted ▁in ▁a ▁type - safe ▁way : ▁ ▁class ▁R ational Number ▁implements ▁Compar able < R ational Number > ▁{ ▁▁▁▁▁ ▁int ▁numer ator ; ▁▁▁▁ ▁int ▁denomin ator ; ▁▁▁▁ ▁// ▁... ▁▁▁▁▁▁▁▁▁▁▁▁▁▁ ▁public ▁int ▁compare To ( R ational Number ▁other Num ) ▁{ ▁▁▁▁▁▁▁▁ ▁return ▁Integer . compare ( numer ator ▁* ▁other Num . den omin ator , ▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁ ▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁ ▁other Num . numer ator ▁* ▁denomin ator ); ▁▁▁▁ ▁} ▁} ▁ ▁Another ▁language ▁feature ▁that ▁can ▁help ▁is ▁multiple ▁dispatch . ▁One ▁reason ▁that ▁binary ▁methods ▁are ▁awk ward ▁to