@CanIgnoreReturnValue
  public long getAndAccumulate(K key, long x, LongBinaryOperator accumulatorFunction) {
    checkNotNull(accumulatorFunction);
    return getAndUpdate(key, oldValue -> accumulatorFunction.applyAsLong(oldValue, x));
  }
@CanIgnoreReturnValue
  public long getAndAccumulate(K key, long x, LongBinaryOperator accumulatorFunction) {
    checkNotNull(accumulatorFunction);
    return getAndUpdate(key, oldValue -> accumulatorFunction.applyAsLong(oldValue, x));
  }
@ CanIgnoreReturnValue public long getAndAccumulate ( K key , long x , LongBinaryOperator accumulatorFunction ) { checkNotNull ( accumulatorFunction ) ; return getAndUpdate ( key , oldValue -> accumulatorFunction . applyAsLong ( oldValue , x ) ) ; }
Updates the value currently associated with {@code key} by combining it with {@code x} via the
specified accumulator function, returning the old value. The previous value associated with
{@code key} (or zero, if there is none) is passed as the first argument to {@code
accumulatorFunction}, and {@code x} is passed as the second argument.

@since 21.0
Updates the value currently associated with { @code key } by combining it with { @code x } via the specified accumulator function returning the old value . The previous value associated with { @code key } ( or zero if there is none ) is passed as the first argument to { @code accumulatorFunction } and { @code x } is passed as the second argument .