Other containers ●Can only take object ●Have to“wrap”primitives Oint->Integer,double->Double o Have to cast or unwrap on retrieval ● Slow,error prone,tedious.... Fixed by JDK1.5,hopefully oAdvantage:automatic expandingOther containers lCan only take object lHave to “wrap” primitives ¡int -> Integer, double-> Double lHave to cast or unwrap on retrieval lSlow, error prone, tedious…. lFixed by JDK1.5, hopefully lAdvantage: automatic expanding