将 LocalDateTime Object 转换为 LocalDateTime

Question

I am new to Java and I am working on Java 8.

I am trying to convert LocalDateTime Object to LocalDateTime but not able to find any way without converting it to String. Is there any direct method for converting Object to LocalDateTime when the underlying Object type is LocalDateTime?

Moreover, if there is any way to convert, can it work for underlying String type LocalDateTime Object too?

Below is my current code which is converting the Object to String before converting it to LocalDateTime as LocalDateTime.parse method needs String input.

public static LocalDateTime toDateTime(Object dateTimeObject) {
    LocalDateTime dateTime = LocalDateTime.parse(dateTimeObject.toString(), DateTimeFormatter.ofPattern("yyyy-MM-dd'T'HH:mm:ss"));
    
    return dateTime;
}

Answer 1

If the object is a LocalDateTime , you can cast the object.

public static LocalDateTime toDateTime(Object dateTimeObject) {
    if (dateTimeObject instanceof LocalDateTime) {
        return (LocalDateTime) dateTimeObject;
    }
    return null;
}

Answer 2

According to the Java 8 LocalDateTime API there is no method that takes an Object argument and returns a LocalDateTime. But there is one that takes a CharSequence parameter, which is why it works when you convert the object to String, and why it won't work if you just pass the Object parameter. If you don't want to have to do the call to the toString() method, perhaps the parameter of toDateTime(Object o) should be of a different type.