获取任意月份天数

获取月份天数：

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
public class demo2 {
	public static void main(String[] args) throws ParseException {  
		SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
		String lkm="2023-02-01";
		Calendar calendar = Calendar.getInstance();
		calendar.setTime(sdf.parse(lkm));
		System.out.print("获取月份天数："+calendar.getActualMaximum(Calendar.DAY_OF_MONTH));
	}
}