# Sealed Class

A class or interface that explicitly limits which types may extend or implement it.

## What is **Sealed Class** in Java?

**Sealed Class** — A class or interface that explicitly limits which types may extend or implement it.

```java
sealed interface Payment permits Cash, Card {
}

final class Cash implements Payment {
}

final class Card implements Payment {
}
```

Level: Master · [More Java terms at this level](https://www.ask-codey.com/glossary/subjects/java/master)

Updated: September 27, 2026

Source: https://www.ask-codey.com/glossary/sealed-class