jdk-24/test/langtools/tools/javac/switchexpr/ExhaustiveEnumSwitch.java

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/*
 * @test
 * @bug 8206986
 * @summary Verify that an switch expression over enum can be exhaustive without default.
 * @compile ExhaustiveEnumSwitch.java
 * @compile ExhaustiveEnumSwitchExtra.java
 * @run main ExhaustiveEnumSwitch
 */

public class ExhaustiveEnumSwitch {
    public static void main(String... args) {
        new ExhaustiveEnumSwitch().run();
    }

    private void run() {
        ExhaustiveEnumSwitchEnum v = ExhaustiveEnumSwitchEnum.valueOf("F");

        try {
            print(v);
            throw new AssertionError("Expected exception did not occur.");
        } catch (IncompatibleClassChangeError err) {
            //ok
        }
    }

    private String print(ExhaustiveEnumSwitchEnum t) {
        return switch (t) {
            case A -> "A";
            case B -> "B";
        };
    }

}
enum ExhaustiveEnumSwitchEnum {
    A, B;
}