/*
 * @test /nodynamiccopyright/
 * @bug 8206986
 * @summary Check expression switch works.
 * @compile/fail/ref=ExpressionSwitch-old.out -source 9 -Xlint:-options -XDrawDiagnostics ExpressionSwitch.java
 * @compile --enable-preview -source 12 ExpressionSwitch.java
 * @run main/othervm --enable-preview ExpressionSwitch
 */

import java.util.Objects;

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

    private void run() {
        check(T.A, "A");
        check(T.B, "B");
        check(T.C, "other");
        exhaustive1(T.C);
        localClass(T.A);
    }

    private String print(T t) {
        return switch (t) {
            case A -> "A";
            case B -> { break "B"; }
            default -> { break "other"; }
        };
    }

    private String exhaustive1(T t) {
        return switch (t) {
            case A -> "A";
            case B -> { break "B"; }
            case C -> "C";
            case D -> "D";
        };
    }

    private String exhaustive2(T t) {
        return switch (t) {
            case A -> "A";
            case B -> "B";
            case C -> "C";
            case D -> "D";
        };
    }

    private void localClass(T t) {
        String good = "good";
        class L {
            public String c() {
                STOP: switch (t) {
                    default: break STOP;
                }
                return switch (t) {
                    default: break good;
                };
            }
        }
        String result = new L().c();
        if (!Objects.equals(result, good)) {
            throw new AssertionError("Unexpected result: " + result);
        }
    }

    private void check(T t, String expected) {
        String result = print(t);
        if (!Objects.equals(result, expected)) {
            throw new AssertionError("Unexpected result: " + result);
        }
    }

    enum T {
        A, B, C, D;
    }
    void t() {
        Runnable r = () -> {};
        r.run();
    }
}