最佳答案
您的 Netbeans 安装中似乎没有激活 Java SE。要正确使用 Java SE 功能,您必须遵循 these steps :
- Choose Tools > Plugins from the main IDE's toolbar.
- In the Plugins dialog box, click the Installed tab and select Java SE in the list of available features.
- Click Activate.
- At the Welcome panel of the Installer dialog box, click Activate. When the activation is successfully completed, click Finish.
- Click Close to close the Plugins dialog box.
关于java - 在netbeans项目类别java文件夹中丢失,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/45728511/