没问题，都是输出 2019-12-31

```java
import java.time.LocalDate;
import java.time.format.DateTimeFormatter;

public class Test {
public static void main(String[] args) throws Exception {
System.out.println(LocalDate.now()); // 2019-12-31
System.out.println(DateTimeFormatter.ofPattern("yyyy-MM-dd").format(LocalDate.now())); // 2019-12-31
System.out.println(DateTimeFormatter.ofPattern("YYYY-MM-dd").format(LocalDate.now())); // 2019-12-31
}
}
```