src/main/java/io/reactivex/Observable.java
@CheckReturnValue
    @SchedulerSupport(SchedulerSupport.NONE)
    public final Observable<T> takeLast(int count) {
        if (count < 0) {
            throw new IndexOutOfBoundsException("count >= 0 required but it was " + count);
        } else
        if (count == 0) {
            return RxJavaPlugins.onAssembly(new ObservableIgnoreElements<T>(this));
        } else
        if (count == 1) {
            return RxJavaPlugins.onAssembly(new ObservableTakeLastOne<T>(this));
        }
        return RxJavaPlugins.onAssembly(new ObservableTakeLast<T>(this, count));
    }
@CheckReturnValue
    @SchedulerSupport(SchedulerSupport.NONE)
    public final Observable<T> takeLast(int count) {
        if (count < 0) {
            throw new IndexOutOfBoundsException("count >= 0 required but it was " + count);
        } else
        if (count == 0) {
            return RxJavaPlugins.onAssembly(new ObservableIgnoreElements<T>(this));
        } else
        if (count == 1) {
            return RxJavaPlugins.onAssembly(new ObservableTakeLastOne<T>(this));
        }
        return RxJavaPlugins.onAssembly(new ObservableTakeLast<T>(this, count));
    }
@ CheckReturnValue @ SchedulerSupport ( SchedulerSupport . NONE ) public final Observable < T > takeLast ( int count ) { if ( count < 0 ) { throw new IndexOutOfBoundsException ( "count >= 0 required but it was " + count ) ; } else if ( count == 0 ) { return RxJavaPlugins . onAssembly ( new ObservableIgnoreElements < T > ( this ) ) ; } else if ( count == 1 ) { return RxJavaPlugins . onAssembly ( new ObservableTakeLastOne < T > ( this ) ) ; } return RxJavaPlugins . onAssembly ( new ObservableTakeLast < T > ( this , count ) ) ; }
Returns an Observable that emits at most the last {@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="310" src="https://raw.github.com/wiki/ReactiveX/RxJava/images/rx-operators/takeLast.n.png" alt="">
<dl>
<dt><b>Scheduler:</b></dt>
<dd>This version of {@code takeLast} does not operate by default on a particular {@link Scheduler}.</dd>
</dl>

@param count
the maximum number of items to emit from the end of the sequence of items emitted by the source
ObservableSource
@return an Observable that emits at most the last {@code count} items emitted by the source ObservableSource
@throws IndexOutOfBoundsException
if {@code count} is less than zero
@see <a href="http://reactivex.io/documentation/operators/takelast.html">ReactiveX operators documentation: TakeLast</a>
Returns an Observable that emits at most the last { @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 = 310 src = https : // raw . github . com / wiki / ReactiveX / RxJava / images / rx - operators / takeLast . n . png alt = > <dl > <dt > <b > Scheduler : < / b > < / dt > <dd > This version of { @code takeLast } does not operate by default on a particular { @link Scheduler } . < / dd > < / dl >