[JAVA] Format the contents of LocalDate with DateTimeFormatter

What is this

Since I read toString of java \ .time \ .LocalTime, I will write an example of using DateTimeFormatter as a memorandum.

It's just a memo writing.


Since slf4j is used for log output, pay attention to the dependency when actually running it.

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.time.LocalDateTime;
import java.time.LocalTime;
import java.time.format.DateTimeFormatter;

public class App {

    private static final Logger logger = LoggerFactory.getLogger(App.class);
    private static final DateTimeFormatter formatter = DateTimeFormatter.ofPattern("HH:mm:ss.SSS");
    private static final DateTimeFormatter formatter2 = DateTimeFormatter.ofPattern("yyyy/MM/dd HH:mm:ss.SSS");

    public static void main(String... args) {

        var time = LocalTime.now();

        time = LocalTime.of(14,30);


        var datetime = LocalDateTime.now();

        datetime = LocalDateTime.of(2018,8,16,10,55);

Processing result

16:08:49.562 [main] INFO  App - 16:08:49.555999800
16:08:49.572 [main] INFO  App - 16:08:49.555
16:08:49.572 [main] INFO  App - 14:30
16:08:49.572 [main] INFO  App - 14:30:00.000
16:08:49.572 [main] INFO  App - ---------------------
16:08:49.572 [main] INFO  App - 2018-08-16T16:08:49.572009800
16:08:49.573 [main] INFO  App - 2018/08/16 16:08:49.572
16:08:49.573 [main] INFO  App - 2018-08-16T10:55
16:08:49.573 [main] INFO  App - 2018/08/16 10:55:00.000

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