Dmitry Roo

class Example {
    public static void main(String[] args) {
        var licenses = List.of(
                new License(1, true),
                new License(2, false),
                new License(3, true)
                );
        
        var licenseMap = licenses.stream()
                .collect(Collectors.toMap(License::getId, License::isActive));
    }

    @Getter
    @RequiredArgsConstructor
    private static class License {
        private final Integer id;
        private final boolean isActive;
    }
}