openjdk/jdk/src/share/classes/java/util/function/DoubleConsumer.java

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 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
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package java.util.function;

import java.util.Objects;

/**
 * An operation which accepts a single double argument and returns no result.
 * This is the primitive type specialization of {@link Consumer} for
 * {@code double}. Unlike most other functional interfaces,
 * {@code DoubleConsumer} is expected to operate via side-effects.
 *
 * @see Consumer
 * @since 1.8
 */
@FunctionalInterface
public interface DoubleConsumer {

    /**
     * Accept an input value.
     *
     * @param value the input value
     */
    void accept(double value);

    /**
     * Returns a {@code DoubleConsumer} which performs, in sequence, the operation
     * represented by this object followed by the operation represented by
     * another {@code DoubleConsumer}.
     *
     * <p>Any exceptions thrown by either {@code accept} method are relayed
     * to the caller; if performing this operation throws an exception, the
     * other operation will not be performed.
     *
     * @param other a DoubleConsumer which will be chained after this
     * DoubleConsumer
     * @return an DoubleConsumer which performs in sequence the {@code accept} method
     * of this DoubleConsumer and the {@code accept} method of the specified IntConsumer
     * operation
     * @throws NullPointerException if other is null
     */
    default DoubleConsumer chain(DoubleConsumer other) {
        Objects.requireNonNull(other);
        return (double t) -> { accept(t); other.accept(t); };
    }
}