list stream 求和

你可以使用Java 8的Stream来对List进行求和操作。如果List中的元素是对象，并且你需要对特定属性进行求和，可以使用mapToLong方法，将属性映射为Long类型，然后使用sum方法进行求和。例如，如果List中的元素是User对象，你可以按如下方式求和年龄：int sum = list.stream().mapToLong(User::getAge).sum();<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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