Java“此语言级别不支持 lambda 表达式" [英] Java "lambda expressions not supported at this language level"

问题描述

我正在测试 Java 8 的一些新功能并将示例复制到我的 IDE(最初是 Eclipse，然后是 IntelliJ)中，如图

I was testing out some new features of Java 8 and copied the example into my IDE (Eclipse originally, then IntelliJ) as shown here

Eclipse offered no support whatsoever for lambda expressions, and IntelliJ kept reporting an error

Lambda expressions not supported at this language level

I would like to know if this is a problem with my install, the code, or support.

解决方案

In IntelliJ IDEA:

In File Menu → Project Structure → Project, change Project Language Level to 8.0 - Lambdas, type annotations etc.

For Android 3.0+ Go File → Project Structure → Module → app and In Properties Tab set Source Compatibility and Target Compatibility to 1.8 (Java 8)

Screenshot:

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