java 获取当前是本年、本月、本季度 第几周

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import java.util.Calendar; public class Date6 {     public static void main(String[] args)     {         Calendar c = Calendar.getInstance();         int month=c.get(c.WEEK_OF_MONTH);         int week = c.get(c.WEEK_OF_YEAR);         String quarter="";         int m=c.get(c.MONTH);         if (m >= 1 && m == 3) {             quarter = "1";         }         else if (m >= 4 && m <= 6) {             quarter = "2";         }         else if (m >= 7 && m <= 9) {             quarter = "3";         }         else {             quarter = "4";         }         System.out.println("今天是今年的第" + week + "周;");         System.out.println("今天是今月的第" + month + "周;");         System.out.println("当前季度为"+quarter+"季度");       } }