使用IDE支持，使Intellij IDEA允许在Java 5 6 7语言级别使用lambda

Question

因为retrolambda ，我们可以在java 5 6 7中使用java 8 lambda特性。那么，如何让Intellij Idea在java 5 6 7语言级别允许lambda，还有lambda的ide特性？

Answer 1

In IntelliJ IDEA you will need to set the language level for the module to be Java 8, or else IDEA will give red squiggly lines about lambda expressions.

In Settings | Inspections | Java language level migration aids | Usages of API documented as @since 1.5 (1.6|1.7) Settings | Inspections | Java language level migration aids | Usages of API documented as @since 1.5 (1.6|1.7) Settings | Inspections | Java language level migration aids | Usages of API documented as @since 1.5 (1.6|1.7) you can choose it to warn about usages of API that is documented as @since 1.8 .

Additionally you should run all the tests for your project using the Java 7 runtime, or whatever is your target. For Maven this can be configured using Surefire's jvm property . During development, inside IDEA, it's more practical to run the tests just with Java 8.