Java 在日期时间格式模式中使用可选节

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import java.time.LocalDate;/**来自 时 代 J a v a 公 众 号 - nowjava.com**/

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import java.time.LocalDateTime;

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import java.time.LocalTime;

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import java.time.Month;

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import java.time.format.DateTimeFormatter;

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public class Main {

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  public static void main(String[] args) {

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    // A pattern with an optional section

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    String pattern = "MM/dd/yyyy[ 'at' HH:mm:ss]";

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    DateTimeFormatter fmt = DateTimeFormatter.ofPattern(pattern);

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    LocalDate ld = LocalDate.of(2012, Month.MAY, 30);

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    LocalTime lt = LocalTime.of(17, 30, 12);

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    LocalDateTime ldt = LocalDateTime.of(ld,lt);

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    // Format a date. Optional section will be skipped because a 

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    // date does not have time (HH, mm, and ss) information.

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    String str1 = fmt.format(ld);

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    System.out.println(str1);

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    /**

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