src/main/java/io/reactivex/Observable.java
@CheckReturnValue
    @SchedulerSupport(SchedulerSupport.NONE)
    public final Observable<T> take(long count) {
        if (count < 0) {
            throw new IllegalArgumentException("count >= 0 required but it was " + count);
        }
        return RxJavaPlugins.onAssembly(new ObservableTake<T>(this, count));
    }
@CheckReturnValue
    @SchedulerSupport(SchedulerSupport.NONE)
    public final Observable<T> take(long count) {
        if (count < 0) {
            throw new IllegalArgumentException("count >= 0 required but it was " + count);
        }
        return RxJavaPlugins.onAssembly(new ObservableTake<T>(this, count));
    }
@ CheckReturnValue @ SchedulerSupport ( SchedulerSupport . NONE ) public final Observable < T > take ( long count ) { if ( count < 0 ) { throw new IllegalArgumentException ( "count >= 0 required but it was " + count ) ; } return RxJavaPlugins . onAssembly ( new ObservableTake < T > ( this , count ) ) ; }
Returns an Observable that emits only the first {@code count} items emitted by the source ObservableSource. If the source emits fewer than
{@code count} items then all of its items are emitted.
<p>
<img width="640" height="305" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/take.png" alt="">
<p>
This method returns an ObservableSource that will invoke a subscribing {@link Observer}'s
{@link Observer#onNext onNext} function a maximum of {@code count} times before invoking
{@link Observer#onComplete onComplete}.
<dl>
<dt><b>Scheduler:</b></dt>
<dd>This version of {@code take} does not operate by default on a particular {@link Scheduler}.</dd>
</dl>

@param count
the maximum number of items to emit
@return an Observable that emits only the first {@code count} items emitted by the source ObservableSource, or
all of the items from the source ObservableSource if that ObservableSource emits fewer than {@code count} items
@see <a href="http://reactivex.io/documentation/operators/take.html">ReactiveX operators documentation: Take</a>
Returns an Observable that emits only the first { @code count } items emitted by the source ObservableSource . If the source emits fewer than { @code count } items then all of its items are emitted . <p > <img width = 640 height = 305 src = https : // raw . github . com / wiki / ReactiveX / RxJava / images / rx - operators / take . png alt = > <p > This method returns an ObservableSource that will invoke a subscribing { @link Observer } s { @link Observer#onNext onNext } function a maximum of { @code count } times before invoking { @link Observer#onComplete onComplete } . <dl > <dt > <b > Scheduler : < / b > < / dt > <dd > This version of { @code take } does not operate by default on a particular { @link Scheduler } . < / dd > < / dl >