RxJava BehaviorSubject类

RxJava BehaviorSubject类 介绍

BehaviorSubject 向每个订阅的观察者发出它最近观察到的项目，然后是所有后续观察到的项目。

RxJava BehaviorSubject类 声明

public final class BehaviorSubject<T>
extends Subject<T>

RxJava BehaviorSubject类 示例

package com.yiidian;

import io.reactivex.subjects.BehaviorSubject;

public class ObservableTester  {
   public static void main(String[] args) {   
      final StringBuilder result1 = new StringBuilder();
      final StringBuilder result2 = new StringBuilder();         
      BehaviorSubject<String> subject =  BehaviorSubject.create();
      subject.subscribe(value -> result1.append(value) ); 
      subject.onNext("a"); 
      subject.onNext("b"); 
      subject.onNext("c"); 
      subject.subscribe(value -> result2.append(value)); 
      subject.onNext("d"); 
      subject.onComplete();
      //Output will be abcd
      System.out.println(result1);
      //Output will be cd being BehaviorSubject 
      //(c is last item emitted before subscribe)
      System.out.println(result2);
   }
}

输出结果为：