问题：
有时在开发中想直接写一个java文件来测试一些东西，但是AndroidStudio执行的时候会报错。
代码信息：
public class HelloWorld {
public static void main(String[] args) {
System.out.println("HelloWorld");
}
}
报错信息
12:04:41: Executing task 'HelloWorld.main()'...
Executing tasks: [HelloWorld.main()] in project D:\AndroidStudioProjects\MyApplication8
> Configure project :app
WARNING: The following project options are deprecated and have been removed:
android.enableAapt2
This property has no effect, AAPT2 is now always used.
FAILURE: Build failed with an exception.
* Where:
Initialization script 'C:\Users\cj\AppData\Local\Temp\HelloWorld_main__.gradle' line: 20
* What went wrong:
A problem occurred configuring project ':app'.
> Could not create task ':app:HelloWorld.main()'.
> SourceSet with name 'main' not found.
* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights.
* Get more help at https://help.gradle.org
Deprecated Gradle features were used in this build, making it incompatible with Gradle 6.0.
Use '--warning-mode all' to show the individual deprecation warnings.
See https://docs.gradle.org/5.6.4/userguide/command_line_interface.html#sec:command_line_warnings
BUILD FAILED in 116ms
12:04:41: Task execution finished 'HelloWorld.main()'.
解决方案
在.idea文件夹中找到gradle.xml， 打开文件，在标签下添加
添加后文件内容
结果
image.png
总结
再次运行就可以显示执行结果了，据说这句话的意思是不让gradle接管构建任务，防止当作gradle的task来执行。
