Form drag and stretch based on swing

This paper shares the specific code of swing to realize form drag and stretch for your reference. The specific contents are as follows

When setundecorated (true) is used, JFrame has to write drag and stretch functions by itself after removing the title bar.

The following is the effect picture. My screenshot software cannot intercept the cursor other than the system default cursor, so the cursor changes in all directions are not reflected in the picture

The code is as follows:

The above is the whole content of this article. I hope it will be helpful to your study, and I hope you can support programming tips.