1.Java 星期几 （JDK8）

1.星期几取得：

LocalDate date = LocalDate.now();

DateTimeFormatter formatter = DateTimeFormatter.ofPattern("E");

String text = date.format(formatter);

System.out.println("测试..." + text);

2.JDK API得注释：

All letters 'A' to 'Z' and 'a' to 'z' are reserved as pattern letters. The following pattern letters are defined: