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                ## Materialize/Dematerialize `Materialize`將數據項和事件通知都當做數據項發射,`Dematerialize`剛好相反。 ![materialize](https://box.kancloud.cn/449bfc4e9c452b4dbc5fb5702c2d3b4d_1280x630.png) 一個合法的有限的Obversable將調用它的觀察者的`onNext`方法零次或多次,然后調用觀察者的`onCompleted`或`onError`正好一次。`Materialize`操作符將這一系列調用,包括原來的`onNext`通知和終止通知`onCompleted`或`onError`都轉換為一個Observable發射的數據序列。 RxJava的`materialize`將來自原始Observable的通知轉換為`Notification`對象,然后它返回的Observable會發射這些數據。 `materialize`默認不在任何特定的調度器 ([`Scheduler`](Scheduler.md)) 上執行。 * Javadoc: [materialize()](http://reactivex.io/RxJava/javadoc/rx/Observable.html#materialize()) ![dematerialize](https://box.kancloud.cn/99c9f1d116f4a88887155664dd1159d9_1280x670.png) `Dematerialize`操作符是`Materialize`的逆向過程,它將`Materialize`轉換的結果還原成它原本的形式。 `dematerialize`反轉這個過程,將原始Observable發射的`Notification`對象還原成Observable的通知。 `dematerialize`默認不在任何特定的調度器 ([`Scheduler`](Scheduler.md)) 上執行。 * Javadoc: [dematerialize()](http://reactivex.io/RxJava/javadoc/rx/Observable.html#dematerialize())
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