Rx java 以下情况下出现RxJava编译错误
我想尝试一下非常简单的RxJava代码,如下所示Rx java 以下情况下出现RxJava编译错误,rx-java,rx-java2,Rx Java,Rx Java2,我想尝试一下非常简单的RxJava代码,如下所示 int[] test = {1,2,3,4}; Observable<Integer> findAverage = Observable.fromArray(test); averageInteger(findAverage).subscribe(System.out::println); int[]test={1,2,3,4}; 可观测的findAverage=可观测的数组(测试); averageInteger(find
int[] test = {1,2,3,4};
Observable<Integer> findAverage = Observable.fromArray(test);
averageInteger(findAverage).subscribe(System.out::println);
int[]test={1,2,3,4};
可观测的findAverage=可观测的数组(测试);
averageInteger(findAverage).subscribe(System.out::println);
首先,我遇到了observable.fromArray(test)的编译错误(不可数边界)
第二,似乎再也找不到几位企业家了。我使用的是RxJava的2.0.8版本。这是因为findAverage的类型错误: 应该是:
Observable<int[]> observable = Observable.fromArray(array);
Observable-Observable=Observable.fromArray(数组);
带有以下Gradle包的完整示例:“com.github.akarnokd:rxjava2扩展:0.16.4”
List integers=Arrays.asList(1,2,3,4);
可观测的整数可观测=可观测的。可观测的(整数);
Observable doubleObservable=MathObservable.averageDouble(整数可观测);
doubleObservable.subscribe(System.out::println);
作为操作员执行:
@Test
public void averageDoubleOperator() throws Exception {
List<Integer> integers = Arrays.asList(1, 2, 3, 4);
Observable<Integer> integerObservable = Observable.fromIterable(integers);
integerObservable.lift(new AvgOperator())
.test()
.assertResult(2.5);
}
@Test
public void averageDoubleOperator_empty() throws Exception {
List<Integer> integers = Collections.emptyList();
Observable<Integer> integerObservable = Observable.fromIterable(integers);
integerObservable.lift(new AvgOperator())
.test()
.assertTerminated()
.assertError(IllegalStateException.class);
}
class Avg {
long count;
int sum;
Avg(long count, int sum) {
this.count = count;
this.sum = sum;
}
}
class AvgOperator implements ObservableOperator<Double, Integer> {
@Override
public Observer<? super Integer> apply(Observer<? super Double> observer) throws Exception {
return new Operation(observer);
}
class Operation implements Observer<Integer> {
private final Observer<? super Double> observer;
private Subscription s;
private long sum;
private int count;
Operation(Observer<? super Double> observer) {
this.observer = observer;
}
@Override
public void onSubscribe(Disposable d) {
observer.onSubscribe(d);
}
@Override
public void onNext(Integer integer) {
++count;
sum = sum + integer;
}
@Override
public void onError(Throwable t) {
this.observer.onError(t);
}
@Override
public void onComplete() {
if (count == 0) {
this.onError(new IllegalStateException("Average is not defined for 0 values."));
return;
}
this.observer.onNext(sum / (double) count);
this.observer.onComplete();
}
}
}
@测试
public void averageDoubleOperator()引发异常{
List integers=Arrays.asList(1,2,3,4);
可观测的整数可观测=可观测的。可观测的(整数);
integerObservable.lift(新的AvgOperator())
.test()
.资产评估结果(2.5);
}
@试验
public void averageDoubleOperator_empty()引发异常{
List integers=Collections.emptyList();
可观测的整数可观测=可观测的。可观测的(整数);
integerObservable.lift(新的AvgOperator())
.test()
.资产终止()
.assertError(IllegalStateException.class);
}
平均等级{
长计数;
整数和;
平均值(长计数、整数和){
this.count=计数;
this.sum=sum;
}
}
类AVGOOperator实现ObserveOperator{
@凌驾
公共观察者这是因为findAverage类型错误:
应该是:
Observable<int[]> observable = Observable.fromArray(array);
Observable-Observable=Observable.fromArray(数组);
带有以下Gradle包的完整示例:“com.github.akarnokd:rxjava2扩展:0.16.4”
List integers=Arrays.asList(1,2,3,4);
可观测的整数可观测=可观测的。可观测的(整数);
Observable doubleObservable=MathObservable.averageDouble(整数可观测);
doubleObservable.subscribe(System.out::println);
作为操作员执行:
@Test
public void averageDoubleOperator() throws Exception {
List<Integer> integers = Arrays.asList(1, 2, 3, 4);
Observable<Integer> integerObservable = Observable.fromIterable(integers);
integerObservable.lift(new AvgOperator())
.test()
.assertResult(2.5);
}
@Test
public void averageDoubleOperator_empty() throws Exception {
List<Integer> integers = Collections.emptyList();
Observable<Integer> integerObservable = Observable.fromIterable(integers);
integerObservable.lift(new AvgOperator())
.test()
.assertTerminated()
.assertError(IllegalStateException.class);
}
class Avg {
long count;
int sum;
Avg(long count, int sum) {
this.count = count;
this.sum = sum;
}
}
class AvgOperator implements ObservableOperator<Double, Integer> {
@Override
public Observer<? super Integer> apply(Observer<? super Double> observer) throws Exception {
return new Operation(observer);
}
class Operation implements Observer<Integer> {
private final Observer<? super Double> observer;
private Subscription s;
private long sum;
private int count;
Operation(Observer<? super Double> observer) {
this.observer = observer;
}
@Override
public void onSubscribe(Disposable d) {
observer.onSubscribe(d);
}
@Override
public void onNext(Integer integer) {
++count;
sum = sum + integer;
}
@Override
public void onError(Throwable t) {
this.observer.onError(t);
}
@Override
public void onComplete() {
if (count == 0) {
this.onError(new IllegalStateException("Average is not defined for 0 values."));
return;
}
this.observer.onNext(sum / (double) count);
this.observer.onComplete();
}
}
}
@测试
public void averageDoubleOperator()引发异常{
List integers=Arrays.asList(1,2,3,4);
可观测的整数可观测=可观测的。可观测的(整数);
integerObservable.lift(新的AvgOperator())
.test()
.资产评估结果(2.5);
}
@试验
public void averageDoubleOperator_empty()引发异常{
List integers=Collections.emptyList();
可观测的整数可观测=可观测的。可观测的(整数);
integerObservable.lift(新的AvgOperator())
.test()
.资产终止()
.assertError(IllegalStateException.class);
}
平均等级{
长计数;
整数和;
平均值(长计数、整数和){
this.count=计数;
this.sum=sum;
}
}
类AVGOOperator实现ObserveOperator{
@凌驾
public observer您至少需要Integer[]test={1,2,3,4};
因为RxJava本身不支持基元数组。您至少需要Integer[]test={1,2,3,4}因为RxJava本身不支持基元数组。看起来MathObservable来自RxJava math,rxjava2不支持它。MathObservable来自rxjava2扩展,因为原生rxjava2不支持它。您可以复制MathObservable的实现,或者使用reduce oper编写自己的实现ator。看起来MathObservable来自rxjava math,RxJava2a不支持它,因为MathObservable来自rxjava2扩展,因为原生rxjava2不支持它。您可以复制MathObservable的实现,也可以使用reduce运算符编写自己的实现。