RxJava-创建运算符 - 芒果文档

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📜 RxJava-创建运算符

📅 最后修改于: 2020-11-12 05:28:15 🧑 作者: Mango

以下是用于创建Observable的运算符。

Sr.No.	Operator & Description
1	Create Creates an Observable from scratch and allows observer method to call programmatically.
2	Defer Do not create an Observable until an observer subscribes. Creates a fresh observable for each observer.
3	Empty/Never/Throw Creates an Observable with limited behavior.
4	From Converts an object/data structure into an Observable.
5	Interval Creates an Observable emitting integers in sequence with a gap of specified time interval.
6	Just Converts an object/data structure into an Observable to emit the same or same type of objects.
7	Range Creates an Observable emitting integers in sequence of given range.
8	Repeat Creates an Observable emitting integers in sequence repeatedly.
9	Start Creates an Observable to emit the return value of a function.
10	Timer Creates an Observable to emit a single item after given delay.

创建运算符示例

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 fromArray operator to create 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