// ĠOriginal Ġbug : ĠK T - 4 2 7 1 1 Ċ Ċ class ĠU Long Mutable Collection ( private Ġval Ġmc : ĠMutable Collection < UL ong >) Ġ: ĠMutable Collection < UL ong > Ġ{ ĊĠĠĠ Ġoverride Ġval Ġsize : ĠInt Ġget () Ġ= Ġmc . size ĊĠĠĠ Ġoverride Ġfun Ġcontains ( element : ĠU Long ): ĠBoolean Ġ= Ġmc . contains ( element ) ĊĠĠĠ Ġoverride Ġfun Ġcontains All ( elements : ĠCollection < UL ong >): ĠBoolean Ġ= Ġmc . contains All ( elements ) ĊĠĠĠ Ġoverride Ġfun ĠisEmpty (): ĠBoolean Ġ= Ġmc . isEmpty () ĊĠĠĠ Ġoverride Ġfun Ġadd ( element : ĠU Long ): ĠBoolean Ġ= Ġmc . add ( element ) ĊĠĠĠ Ġoverride Ġfun Ġadd All ( elements : ĠCollection < UL ong >): ĠBoolean Ġ= Ġmc . addAll ( elements ) ĊĠĠĠ Ġoverride Ġfun Ġclear () Ġ{ Ġmc . clear () Ġ} ĊĠĠĠ Ġoverride Ġfun Ġiterator (): ĠMutable Iterator < UL ong > Ġ= Ġmc . iterator () ĊĠĠĠ Ġoverride Ġfun Ġremove ( element : ĠU Long ): ĠBoolean Ġ= Ġmc . remove ( element ) ĊĠĠĠ Ġoverride Ġfun Ġremove All ( elements : ĠCollection < UL ong >): ĠBoolean Ġ= Ġmc . removeAll ( elements ) ĊĠĠĠ Ġoverride Ġfun Ġretain All ( elements : ĠCollection < UL ong >): ĠBoolean Ġ= Ġmc . retain All ( elements ) Ċ } Ċ