package Ġcom . wk x jc . wan android . common . bean Ċ Ċ data Ġclass ĠKnowledge Trees ( val Ġdata : ĠMutable List < Knowledge Tree Bean > Ġ= Ġmutable ListOf ()) Ġ{ ĊĠĠĠ Ġfun Ġrefresh ( knowledge Trees : ĠKnowledge Trees ) Ġ{ ĊĠĠĠĠĠĠĠ Ġdata . clear () ĊĠĠĠĠĠĠĠ Ġdata . addAll ( knowledge Trees . data ) ĊĠĠĠ Ġ} Ċ }