if (collectionutils.isnotempty(faqexcelvos)) { faqexcelvos.foreach(faqexcelvo -> { if (faqexcelvo.getanswer().length() > excel2007.getmaxtextlength()) { string answer = faqexcelvo.getanswer(); faqexcelvo.setanswer(answer.substring(0, excel2007.getmaxtextlength())); faqexcelvo.setoverlimitanswer(answer.substring(excel2007.getmaxtextlength())); } }); }通过optional优化

在Java 8中，我们可以使用Optional类来优化这段代码，使其更简洁。首先，我们需要导入Optional类： ```java import java.util.Optional; ``` 然后，我们可以修改foreach循环如下： ```java Optional.ofNullable(faqexcelvos) .ifPresent(faqexcelvosList -> { faqexcelvosList.forEach(faqexcelvo -> { Optional<String> answerOpt = Optional.ofNullable(faqexcelvo.getAnswer()); answerOpt.ifPresent(answer -> { if (answer.length() > excel2007.getMaxTextLength()) { String shortenedAnswer = answer.substring(0, excel2007.getMaxTextLength()); String overLimitAnswer = answer.substring(excel2007.getMaxTextLength()); faqexcelvo.setAnswer(shortenedAnswer); faqexcelvo.setOverLimitAnswer(overLimitAnswer); } }); }); }); ``` 这样，我们使用Optional.ofNullable检查faqexcelvos是否为null，如果非空则执行后续操作。对于answer字段，我们也使用Optional.ofNullable检查其是否为空，避免了null pointer异常。如果answer长度超过限制，我们就将其截断并设置新的值。 [2024-05-20 11:25:30 | AI写代码神器 | 251点数解答]