Calendar.getInstance()获取指定时间点(定时)

public class Test1 {
    public static void main(String[]args){
        System.out.println("时间为：\n"+getDate1()+"\n"+getDate2()+"\n"+getDate3()+"\n"+getDate4()+"\n"+getDate5());
    }

/*    Calendar.HOUR_OF_DAY     24小时制
    Calendar.HOUR     12小时制*/

    //获取当天0点时间
    public static String getDate1(){
         Calendar cal = Calendar.getInstance();
         cal.set(Calendar.HOUR_OF_DAY, 0);//控制时
         cal.set(Calendar.MINUTE, 0);//控制分
         cal.set(Calendar.SECOND, 0);//控制秒
         SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
         return sdf.format(cal.getTime());
    }

    //获取当天12点时间
    public static String getDate2(){
         Calendar cal = Calendar.getInstance();
         cal.set(Calendar.HOUR_OF_DAY, 12);
         cal.set(Calendar.MINUTE, 0);
         cal.set(Calendar.SECOND, 0);
         SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
         return sdf.format(cal.getTime());
    }    

    //获取本周一0点时间
    public static String getDate3(){
         Calendar cal = Calendar.getInstance();
         cal.set(cal.get(Calendar.YEAR),cal.get(Calendar.MONDAY), cal.get(Calendar.DAY_OF_MONTH), 0, 0,0);
         cal.set(Calendar.DAY_OF_WEEK, Calendar.MONDAY);
         SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
         return sdf.format(cal.getTime());
    }    

    //获取本月第一天0点时间
    public static String getDate4(){
         Calendar cal = Calendar.getInstance();
         cal.set(cal.get(Calendar.YEAR),cal.get(Calendar.MONDAY), cal.get(Calendar.DAY_OF_MONTH), 0, 0,0);
         cal.set(Calendar.DAY_OF_MONTH,cal.getActualMinimum(Calendar.DAY_OF_MONTH));
         SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
         return sdf.format(cal.getTime());
    }

         //获得本月最后一天24点时间
    public static String getDate5(){
         Calendar cal = Calendar.getInstance();
         cal.set(cal.get(Calendar.YEAR),cal.get(Calendar.MONDAY), cal.get(Calendar.DAY_OF_MONTH), 0, 0,0);
         cal.set(Calendar.DAY_OF_MONTH,cal.getActualMaximum(Calendar.DAY_OF_MONTH));
         cal.set(Calendar.HOUR_OF_DAY, 24);
         SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
         return sdf.format(cal.getTime());
    }        

}