要使用Calendar类，请导入以下程序包。import java.util.Calendar;
创建一个Calendar类对象。Calendar cal = Calendar.getInstance();
现在，使用以下字段获取月份和年份的星期。Calendar.WEEK_OF_MONTH
Calendar.WEEK_OF_YEAR
以下是一个示例。
示例import java.util.Calendar;
public class Demo {
public static void main(String[] args) {
Calendar cal = Calendar.getInstance();
// current date and time
System.out.println(cal.getTime().toString());
// date information
System.out.println("\nDate Information..........");
System.out.println("Year = " + cal.get(Calendar.YEAR));
System.out.println("Month = " + (cal.get(Calendar.MONTH) + 1));
System.out.println("Date = " + cal.get(Calendar.DATE));
// week
System.out.println("Week of month = " + cal.get(Calendar.WEEK_OF_MONTH));
System.out.println("Week of year = " + cal.get(Calendar.WEEK_OF_YEAR));
// time information
System.out.println("\nTime Information..........");
System.out.println("Hour (24 hour format) : " + cal.get(Calendar.HOUR_OF_DAY));
System.out.println("Hour (12 hour format) : " + cal.get(Calendar.HOUR));
System.out.println("Minute : " + cal.get(Calendar.MINUTE));
System.out.println("Second : " + cal.get(Calendar.SECOND));
System.out.println("Millisecond : " + cal.get(Calendar.MILLISECOND));
}
}
输出结果Mon Nov 19 14:28:46 UTC 2018
Date Information..........
Year = 2018
Month = 11
Date = 19
Week of month = 4
Week of year = 47
Time Information..........
Hour (24 hour format) : 14
Hour (12 hour format) : 2
Minute : 28
Second : 46
Millisecond : 464
