11 lines
409 B
Java
11 lines
409 B
Java
// interfaces/SealedSubclasses.java
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// (c)2021 MindView LLC: see Copyright.txt
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// We make no guarantees that this code is fit for any purpose.
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// Visit http://OnJava8.com for more book information.
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// {NewFeature} Since JDK 17
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sealed class Bottom permits Level1 {}
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sealed class Level1 extends Bottom permits Level2 {}
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sealed class Level2 extends Level1 permits Level3 {}
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final class Level3 extends Level2 {}
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