Java 15 - Record for Sealed Interfaces

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As records are final by default and can extend interfaces. We can define sealed interfaces and let record implement them for better code management.

Example

Consider the following example −

ApiTester.java

public class APITester {
   public static void main(String[] args) {
      Person employee = new Employee(23, "Robert");
      System.out.println(employee.id());
	   System.out.println(employee.name());
   }
}
sealed interface Person permits Employee, Manager {
   int id();
   String name();
}
record Employee(int id, String name) implements Person {}
record Manager(int id, String name) implements Person {}

Compile and Run the program

$javac -Xlint:preview --enable-preview -source 15 APITester.java
$java --enable-preview APITester

Output

23
Robert