6. 4 Maps.pdf - JTb JT MQi?2` 7mM/K2MiH QHH2 iBQM ivT2...

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J<T ;MQi?2` 7mM/<K2Mi<H +QHH2+iBQM ivT2 Bb i?2 K<T X ; K<T Q7 ivT2 Map[Key, Value] Bb < /<i< bi`m+im`2 i?<i <bbQ+B<i2b F2vb Q7 ivT2 Key rBi? p<Hm2b Q7 ivT2 Value X 1t<KTH2b, val romanNumerals = Map( ŏIŏ -> 1, ŏVŏ -> 5, ŏXŏ -> 10) val capitalOfCountry = Map( ŏUSŏ -> ŏWashingtonŏ , ŏSwitzerlandŏ -> ŏBernŏ )
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J<Tb <`2 Ai2`<#H2b *H<bb Map[Key, Value] 2ti2M/b i?2 +QHH2+iBQM ivT2 Iterable[(Key, Value)] X h?2`27Q`2- K<Tb bmTTQ`i i?2 b<K2 +QHH2+iBQM QT2`<iBQMb <b Qi?2` Bi2`<#H2b /QX 1t<KTH2, val countryOfCapital = capitalOfCountry map { case (x, y) => (y, x) } //!Map(ŏWashingtonŏ ->!ŏUSŏ,!ŏBernŏ ->!ŏSwitzerlandŏ) LQi2 i?<i K<Tb 2ti2M/ Bi2`<#H2b Q7 F2vfp<Hm2 T<B`b X AM 7<+i- i?2 bvMi<t key!->!value Bb Dmbi <M <Hi2`M<iBp2 r<v iQ r`Bi2 i?2 T<B` (key, value) X
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J<Tb <`2 6mM+iBQMb *H<bb Map[Key, Value] <HbQ 2ti2M/b i?2 7mM+iBQM ivT2 Key!=>!Value - bQ K<Tb +<M #2 mb2/ 2p2`vr?2`2 7mM+iBQMb +<MX AM T<`iB+mH<`- K<Tb +<M #2 <TTHB2/ iQ F2v <`=mK2Mib, capitalOfCountry( ŏUSŏ ) //!ŏWashingtonŏ
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Zm2`vBM= J<T ;TTHvBM= < K<T iQ < [email protected]= F2v =Bp2b <M 2``Q`, capitalOfCountry( ŏAndorraŏ ) //!java.util.NoSuchElementException:!key!not!found:!Andorra hQ [m2`v < K<T rBi?Qmi FMQrBM= #27Q`2?<M/ r?2i?2` Bi +QMi<BMb < =Bp2M F2v- vQm +<M mb2 i?2 get QT2`<iBQM,
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