01_RxJava操作符示例代码

    抽时间研究了下RxJava，因为网络博文讲述描述性文字较多，示例较少，很多时候不知道怎么开始入手学习RxJava，因此在此发文让想入门的看了博文之后实操一下，步骤很简单：

    1.在网上下载一个RxJava的jar包，我找到一个1.1.5jar包，也不用管版本的高低，先入门是没问题的，写几个例子一点问题没有，什么RxJava2，大家大可不必慌张去学习，研究低版本的，是让我们知道低层版本是怎样做的，在发展到RxJava2的时候，又做了哪些改进，所以遵从一个由低到高的顺序，你不会吃亏的。（扯远了）

    2.在Eclipse里面建一个java工程，新建一个libs目录，将下载到的RxJava 的jar包放到该目录下，然后添加到构建路径（add lib to build path）.

    3.接下来就可以建一个包，然后建一个类，开始在main()里面写示例代码了，学东西先让它运行起来再看是怎么回事儿。接下来贴一下我学习时写的hello world与操作符使用的示例代码，供大家参考，希望对入门的人有所帮助。

package com.gdc.rxjava;import java.util.ArrayList;import java.util.concurrent.TimeUnit;import rx.Observable;import rx.Observable.OnSubscribe;import rx.functions.Func0;import rx.Subscriber;public class HelloWorld {public static void main(String[] args) {// helloworld();// create();// just();// from();// defer();// empty();// never();// throwtest();// interval();// range();repeat();}private static void create() {Observable.create(new OnSubscribe<String>() {@Overridepublic void call(Subscriber<? super String> subscriber) {subscriber.onNext("中华人民共和国 RxJava学习");}}).subscribe(new Subscriber<String>() {@Overridepublic void onCompleted() {System.out.println("onCompleted()");}@Overridepublic void onError(Throwable arg0) {System.out.println("onError():" + arg0);}@Overridepublic void onNext(String arg0) {System.out.println("onNext():" + arg0);}});}private static void just() {Observable.just("中华人民共和国 RxJava学习").subscribe(new Subscriber<String>() {@Overridepublic void onCompleted() {System.out.println("onCompleted()");}@Overridepublic void onError(Throwable arg0) {System.out.println("onError():" + arg0);}@Overridepublic void onNext(String arg0) {System.out.println("onNext():" + arg0);}});}private static void from() {// 1: 数组、// 2:列表// 3:Iterable// 4:Future// 5:Future,Scheduler// 6:Future,timout,timeUnitInteger[] a = new Integer[] { 1, 2, 3, 4, 5, 6, 7 };// 支持2ArrayList<Integer> items = new ArrayList<Integer>();items.add(1);items.add(2);items.add(3);items.add(4);items.add(5);items.add(6);Observable.from(items).subscribe(new Subscriber<Integer>() {@Overridepublic void onCompleted() {System.out.println("onCompleted()");}@Overridepublic void onError(Throwable arg0) {System.out.println("onError():" + arg0);}@Overridepublic void onNext(Integer arg0) {System.out.println("onNext():" + arg0);}});}private static String valuestr;private static void defer() {// Observable observable = Observable.just(valuestr);Observable observable = Observable.defer(new Func0<Observable<String>>() {@Overridepublic Observable<String> call() {return Observable.just(valuestr);}});valuestr = "中华人民共和国RxJava学习";observable.subscribe(new Subscriber<String>() {@Overridepublic void onCompleted() {System.out.println("onCompleted()");}@Overridepublic void onError(Throwable arg0) {System.out.println("onError():" + arg0);}@Overridepublic void onNext(String arg0) {System.out.println("onNext():" + arg0);}});}private static void empty() {Observable.empty().subscribe(new Subscriber() {@Overridepublic void onCompleted() {System.out.println("onCompleted()");}@Overridepublic void onError(Throwable arg0) {System.out.println("onError():" + arg0);}@Overridepublic void onNext(Object arg0) {System.out.println("onNext()");}});}private static void never() {Observable.never().subscribe(new Subscriber() {@Overridepublic void onCompleted() {System.out.println("onCompleted()");}@Overridepublic void onError(Throwable arg0) {System.out.println("onError():" + arg0);}@Overridepublic void onNext(Object arg0) {System.out.println("onNext()");}});}private static void throwtest() {Observable.error(new NullPointerException()).subscribe(new Subscriber() {@Overridepublic void onCompleted() {System.out.println("onCompleted()");}@Overridepublic void onError(Throwable arg0) {System.out.println("onError():" + arg0);}@Overridepublic void onNext(Object arg0) {System.out.println("onNext()");}});}private static void interval(){Observable.interval(1000,TimeUnit.MICROSECONDS).subscribe(new Subscriber() {@Overridepublic void onCompleted() {System.out.println("onCompleted()");}@Overridepublic void onError(Throwable arg0) {System.out.println("onError():" + arg0);}@Overridepublic void onNext(Object arg0) {System.out.println("onNext()");}});}private static void range(){Observable observable = Observable.range(1, 5);observable.subscribe(new Subscriber<Integer>() {@Overridepublic void onCompleted() {System.out.println("onCompleted()");}@Overridepublic void onError(Throwable arg0) {System.out.println("onError():" + arg0);}@Overridepublic void onNext(Integer arg0) {System.out.println("onNext()" + arg0);}});}private static void repeat(){Observable observable = Observable.range(1, 5).repeat(2);observable.subscribe(new Subscriber<Integer>() {@Overridepublic void onCompleted() {System.out.println("onCompleted()");}@Overridepublic void onError(Throwable arg0) {System.out.println("onError():" + arg0);}@Overridepublic void onNext(Integer arg0) {System.out.println("onNext()" + arg0);}});}private static void helloworld() {// s1.创建被观察者Observable myObservable = Observable.create(new OnSubscribe<String>() {@Overridepublic void call(Subscriber<? super String> subscriber) {subscriber.onNext("hello world!!!");// subscriber.onCompleted();throw new NullPointerException();}});// s2.创建观察者Subscriber subscriber = new Subscriber<String>() {@Overridepublic void onCompleted() {System.out.println("onCompleted()");}@Overridepublic void onError(Throwable arg0) {System.out.println("onError()");}@Overridepublic void onNext(String arg0) {System.out.println("onNext():" + arg0);}};// s3.订阅事件myObservable.subscribe(subscriber);}}