The features released in each new version of Java will include some Preview functions, which are mainly used for developers to experience and collect suggestions. Therefore, the functions in the Preview stage are not enabled by default.
If you want to experience the Preview function in a certain Java version, you still need to make some settings to run the program.
The following takes IDEA 2023.2 as an example to demonstrate enabling the Preview function for Java 21.
Step 1: Open settingthe configuration compilation parameters, as shown in the figure below: select the Java version and add the configuration parameters to enable preview--enable-preview
Step 2: Configure Run/Debugparameters and add them to VM parameters--enable-preview
When you execute the relevant test code again, you can see that the parameters have been included --enable-previewand the preview function is running normally.
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