Optional.of() 导致得空指针

//会报空指针,list.get(0).getXXXXXX 返回了null，导致of() 方法抛出空指针
BigDecimal  s = Optional.of(list.get(0).getXXXXXX).orElse(BigDecimal.ZERO);
//正常
BigDecimal  s = Optional.ofNullable(list.get(0).getXXXXXX).orElse(BigDecimal.ZERO);

Optional.of() 源码

public static <T> Optional<T> of(T value) {
    return new Optional<>(value);
}

private Optional(T value) {
    this.value = Objects.requireNonNull(value);
}

public static <T> T requireNonNull(T obj) {
    if (obj == null)
        throw new NullPointerException();
    return obj;
}

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