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package com.gdc.rxjava;
import java.util.List;
import rx.Observable;
import rx.Observer;
import rx.Subscriber;
import rx.functions.Func1;
import rx.functions.Func2;
import rx.observables.GroupedObservable;
public class TransformingDemo {
public static void main(String[] args) {
// testMap();
// testFlatMap();
// testGroupBy();
// testBuffer();
testScan();
}
private static void testMap() {
// 将整型数据转换成String类型输出
Observable.just(1, 2, 3).map(new Func1<Integer, String>() {
@Override
public String call(Integer arg0) {
return arg0 + "";
}
}).subscribe(new Subscriber<String>() {
@Override
public void onCompleted() {
System.out.println("onCompleted()");
}
@Override
public void onError(Throwable arg0) {
System.out.println("onError():" + arg0);
}
@Override
public void onNext(String arg0) {
System.out.println("onNext():" + arg0);
}
});
}
private static void testFlatMap() {
Observable.just(1, 2, 3, 4, 5).flatMap(new Func1<Integer, Observable<? extends String>>() {
@Override
public Observable<? extends String> call(Integer arg0) {
return Observable.just(arg0 + "");
}
}).subscribe(new Subscriber<String>() {
@Override
public void onCompleted() {
System.out.println("onCompleted()");
}
@Override
public void onError(Throwable arg0) {
System.out.println("onError():" + arg0);
}
@Override
public void onNext(String arg0) {
System.out.println("onNext():" + arg0);
}
});
}
private static void testGroupBy() {
Observable.just(1, 2, 3, 4, 5).groupBy(new Func1<Integer, Integer>() {
@Override
public Integer call(Integer arg0) {
// 分组规则
return arg0 % 2;
}
}).subscribe(new Observer<GroupedObservable<Integer, Integer>>() {
@Override
public void onCompleted() {
System.out.println("onCompleted()");
}
@Override
public void onError(Throwable arg0) {
System.out.println("onError():" + arg0);
}
@Override
public void onNext(GroupedObservable<Integer, Integer> arg0) {
arg0.subscribe(new Subscriber<Integer>() {
@Override
public void onCompleted() {
}
@Override
public void onError(Throwable arg0) {
}
@Override
public void onNext(Integer data) {
System.out.println("group:" + arg0.getKey() + " data:" + data);
}
});
}
});
}
private static void testBuffer() {
// 随机生成5个数字,一次性订阅两次,然后打印出来,通过运行得知,只需要3次即可以把数据全部打印出来
Observable.range(1, 5).buffer(2).subscribe(new Subscriber<List<Integer>>() {
@Override
public void onCompleted() {
System.out.println("onCompleted()");
}
@Override
public void onError(Throwable arg0) {
System.out.println("onError():" + arg0);
}
@Override
public void onNext(List<Integer> arg0) {
System.out.println("onNext():" + arg0);
}
});
}
private static void testScan() {
// 1到5的和
Observable.range(1, 5).scan(new Func2<Integer, Integer, Integer>() {
@Override
public Integer call(Integer sum, Integer arg1) {
// sum:当前数据的和,arg1:每一次需要累加的数据
return sum + arg1;
}
}).subscribe(new Subscriber<Integer>() {
@Override
public void onCompleted() {
System.out.println("onCompleted()");
}
@Override
public void onError(Throwable arg0) {
System.out.println("onError():" + arg0);
}
@Override
public void onNext(Integer arg0) {
System.out.println("onNext():" + arg0);
}
});
}
}