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Title: Java 8 Optional最佳指南，优雅解决空指针 | Java程序员进阶之路

Open Graph Title: Java 8 Optional最佳指南，优雅解决空指针

Description: 本文详细介绍了Java 8引入的Optional类，阐述了Optional的设计初衷和用法。通过实际的代码示例，展示了如何使用Optional来优雅地解决空指针问题，避免程序中的NullPointerException。掌握Optional的使用方法，让您的Java代码更加健壮和可靠。

Open Graph Description: 本文详细介绍了Java 8引入的Optional类，阐述了Optional的设计初衷和用法。通过实际的代码示例，展示了如何使用Optional来优雅地解决空指针问题，避免程序中的NullPointerException。掌握Optional的使用方法，让您的Java代码更加健壮和可靠。

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Opengraph URL: https://tobebetterjavaer.com/java8/optional.html

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2.9 Java新特性https://tobebetterjavaer.com/java8/
掌握Stream流https://tobebetterjavaer.com/java8/stream.html
Optional最佳指南https://tobebetterjavaer.com/java8/optional.html
深入浅出Lambda表达式https://tobebetterjavaer.com/java8/Lambda.html
Java 14 新特性https://tobebetterjavaer.com/java8/java14.html
沉默王二https://tobebetterjavaer.com/about-the-author/
01、没有 Optional 会有什么问题https://tobebetterjavaer.com/java8/optional.html#_01、没有-optional-会有什么问题
02、Optional 是如何解决这个问题的https://tobebetterjavaer.com/java8/optional.html#_02、optional-是如何解决这个问题的
03、创建 Optional 对象https://tobebetterjavaer.com/java8/optional.html#_03、创建-optional-对象
04、判断值是否存在https://tobebetterjavaer.com/java8/optional.html#_04、判断值是否存在
05、非空表达式https://tobebetterjavaer.com/java8/optional.html#_05、非空表达式
06、设置（获取）默认值https://tobebetterjavaer.com/java8/optional.html#_06、设置-获取-默认值
07、获取值https://tobebetterjavaer.com/java8/optional.html#_07、获取值
08、过滤值https://tobebetterjavaer.com/java8/optional.html#_08、过滤值
09、转换值https://tobebetterjavaer.com/java8/optional.html#_09、转换值
NullPointerException（NPE）https://javabetter.cn/exception/npe.html
01、没有 Optional 会有什么问题https://tobebetterjavaer.com/java8/optional.html#_01、没有-optional-会有什么问题
02、Optional 是如何解决这个问题的https://tobebetterjavaer.com/java8/optional.html#_02、optional-是如何解决这个问题的
03、创建 Optional 对象https://tobebetterjavaer.com/java8/optional.html#_03、创建-optional-对象
04、判断值是否存在https://tobebetterjavaer.com/java8/optional.html#_04、判断值是否存在
05、非空表达式https://tobebetterjavaer.com/java8/optional.html#_05、非空表达式
06、设置（获取）默认值https://tobebetterjavaer.com/java8/optional.html#_06、设置-获取-默认值
07、获取值https://tobebetterjavaer.com/java8/optional.html#_07、获取值
08、过滤值https://tobebetterjavaer.com/java8/optional.html#_08、过滤值
09、转换值https://tobebetterjavaer.com/java8/optional.html#_09、转换值
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