"Idea" Error:java:Compliance level ' 1.6 ' was incompatible with the target level ' 1.8 '. A compliance level ' 1.8 ' or better is required solution

The following errors often occur at run time:

Error:java:Compliance level ' 1.6 ' was incompatible with target level ' 1.8 '. A compliance level ' 1.8 ' or better is required

The solution is as follows:

1. Click the settings in the File tab, select Build,execution,deployment->compiler->java Compiler, and change the version to 1.8;

2. Click Project Structure in the File tab, select Project Settings->modules, select the language level for version 1.8

After you complete these two steps, the version error no longer occurs when you run it again.

"Idea" Error:java:Compliance level ' 1.6 ' was incompatible with the target level ' 1.8 '. A compliance level ' 1.8 ' or better is required solution