RxJava-转换运算符 - 芒果文档

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📜 RxJava-转换运算符

📅 最后修改于: 2020-11-12 05:28:31 🧑 作者: Mango

以下是用于转换从Observable发出的项的运算符。

Sr.No.	Operator & Description
1	Buffer Gathers items from Observable into bundles periodically and then emit the bundles rather than items.
2	FlatMap Used in nested observables. Transforms items into Observables. Then flatten the items into single Observable.
3	GroupBy Divide an Observable into set of Observables organized by key to emit different group of items.
4	Map Apply a function to each emitted item to transform it.
5	Scan Apply a function to each emitted item, sequentially and then emit the successive value.
6	Window Gathers items from Observable into Observable windows periodically and then emit the windows rather than items.

转换运算符示例

使用您选择的任何编辑器(例如，C：\> RxJava)创建以下Java程序。

ObservableTester.java

import io.reactivex.Observable;
//Using map operator to transform an Observable
public class ObservableTester  { 
   public static void main(String[] args) {    
      String[] letters = {"a", "b", "c", "d", "e", "f", "g"};
      final StringBuilder result = new StringBuilder();
      Observable observable = Observable.fromArray(letters);
      observable
         .map(String::toUpperCase)
         .subscribe( letter -> result.append(letter));
      System.out.println(result);
   }
}

验证结果

使用javac编译器编译类，如下所示：

C:\RxJava>javac ObservableTester.java

现在如下运行ObservableTester-

C:\RxJava>java ObservableTester

它应该产生以下输出-

ABCDEFG