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                ## Just 創建一個發射指定值的Observable ![just](https://box.kancloud.cn/a5a7a3f977de77b3ecf9637e1047b2da_1280x620.png) Just將單個數據轉換為發射那個數據的Observable。 Just類似于From,但是From會將數組或Iterable的數據取出然后逐個發射,而Just只是簡單的原樣發射,將數組或Iterable當做單個數據。 注意:如果你傳遞`null`給Just,它會返回一個發射`null`值的Observable。不要誤認為它會返回一個空Observable(完全不發射任何數據的Observable),如果需要空Observable你應該使用[Empty](#Empty)操作符。 RxJava將這個操作符實現為`just`函數,它接受一至九個參數,返回一個按參數列表順序發射這些數據的Observable。 示例代碼: ```java Observable.just(1, 2, 3) .subscribe(new Subscriber<Integer>() { @Override public void onNext(Integer item) { System.out.println("Next: " + item); } @Override public void onError(Throwable error) { System.err.println("Error: " + error.getMessage()); } @Override public void onCompleted() { System.out.println("Sequence complete."); } }); ``` 輸出 ``` Next: 1 Next: 2 Next: 3 Sequence complete. ``` * Javadoc: [just(item)](http://reactivex.io/RxJava/javadoc/rx/Observable.html#just(T)) (還有其它接受二到九個參數的版本)
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