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更正方法的返回类型
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@@ -309,7 +309,7 @@ public class EasyStream<T> extends AbstractEnhancedWrappedStream<T, EasyStream<T
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* 计算decimal的总和
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*
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* @param mapper 映射
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* @return {@link OptionalDouble}
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* @return {@link BigDecimal}
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*/
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public BigDecimal sum(final Function<? super T, BigDecimal> mapper) {
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return stream.map(mapper).reduce(BigDecimal.ZERO, BigDecimal::add);
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