http://teavm.org/docs/intro/overview.html，是这样说的：
If you have tightly-coupled applications that use Swing, you want to run
these applications in web, and you don’t care about download size, start-up
time and performance, you should probably look elsewhere; there are more
appropriate tools for you, like CheerpJ.https://www.leaningtech.com/pages/cheerpj.html，说：
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the Java compiler for the Web
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converts any Java client application into standard HTML5/WebAssembly/JavaScript
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works from Java bytecode, without requiring access to the source code
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compatible with 100% of Java (reflection and dynamic classes included)
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turn-key solution, works on Java Swing clients, Java applets, and Java libraries
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actively developed and supported by Leaning Technologies experts
