Lombok ①導入編 - Qiita

public class DateTime { private LocalDateTime value = LocalDateTime.MIN; public DateTime() { } public DateTime( LocalDateTime value ) { this.value = value; } public boolean isEmpty() { return value == null; } public boolean isNotEmpty() { return !isEmpty(); } public String format( String pattern ) { DateTimeFormatter formatter = DateTimeFormatter.ofPattern( pattern); return formatter.format( value