Java 常用类库 之 SimpleDateFormat 日期格式化

Posted 2020-11-19 verejava

http://www.verejava.com/?id=16993055673892

/**
    知识点：Calandar 日期处理类
*/
import java.util.*;
import java.text.*;
public class TestCalendar2
{
    public static void main(String[] args)
    {
        //实例化 Calandar 对象
        System.out.println(DateTime.add(2));

        System.out.println(DateTime.compareTo("2012-12-28 10:45:12","2012-12-28 10:45:12"));
        
    }
}
/**
    日期类的封装
        
*/
class DateTime
{
    /**
        取得当前日期
    */
    public static String add(int day)
    {
        Calendar c=Calendar.getInstance();
        SimpleDateFormat df=new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");
        c.add(Calendar.DAY_OF_YEAR,day);
        return df.format(c.getTime());
    }

    public static int compareTo(String str1,String str2)
    {
        try
        {
            SimpleDateFormat df=new SimpleDateFormat("yyyy-MM-dd 00:00:00");
            Date d1=df.parse(str1);
            Date d2=df.parse(str2);
            if(d1.after(d2))
            {
                return 1;
            }
            else
            {
                return -1;
            }
        }
        catch (Exception e)
        {
            
        }
        
        return 0;
    }

}

http://www.verejava.com/?id=16993055673892