获取Java中特定于区域设置的日期/时间格式

import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Locale;

public class DateTimeFormatExample {
    public static void main(String[] args) {
        // 获取默认的日期/时间格式化对象
        DateFormat defaultDateFormat = DateFormat.getInstance();
        String defaultFormattedDate = defaultDateFormat.format(new Date());
        System.out.println("Default Date Format: " + defaultFormattedDate);

        // 获取特定类型的日期/时间格式化对象
        DateFormat dateInstance = DateFormat.getDateInstance(DateFormat.SHORT, Locale.US);
        String formattedDate = dateInstance.format(new Date());
        System.out.println("Short Date Format: " + formattedDate);

        DateFormat timeInstance = DateFormat.getTimeInstance(DateFormat.MEDIUM, Locale.US);
        String formattedTime = timeInstance.format(new Date());
        System.out.println("Medium Time Format: " + formattedTime);

        DateFormat dateTimeInstance = DateFormat.getDateTimeInstance(DateFormat.LONG, DateFormat.SHORT, Locale.US);
        String formattedDateTime = dateTimeInstance.format(new Date());
        System.out.println("Long Date Time Format: " + formattedDateTime);

        // 使用自定义的日期/时间格式
        SimpleDateFormat customDateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss", Locale.US);
        String customFormattedDate = customDateFormat.format(new Date());
        System.out.println("Custom Date Format: " + customFormattedDate);
    }
}

Default Date Format: 9/30/21, 10:30 AM
Short Date Format: 9/30/21
Medium Time Format: 10:30:00 AM
Long Date Time Format: September 30, 2021 10:30 AM
Custom Date Format: 2021-09-30 10:30:00