Java Calendar and SimpleDateFormat 时间模块

package UtilTest;
import java.util.Calendar;
import java.text.SimpleDateFormat;
import org.apache.commons.lang.RandomStringUtils;

public class TimeTest {
  static String time=null;
  public static void main(String[] args ) {
    System.out.println(getLocaltime());
    System.out.println(getfurTime(0, 0, 0, 0, 2, 0));
    System.out.println(comparetime(getLocaltime(),getfurTime(0, 0, 0, 0, 2, 0)));
    System.out.println(getrdnum());
  }
  public static String getLocaltime() {
    Calendar calendar =Calendar.getInstance();
    time=(new SimpleDateFormat(("yyyy-MM-dd  HH:mm:ss:SS"))).format(calendar.getTime());
    return time;
  }
  public static String  getfurTime(int Y,int M ,int Date,int h,int m,int s) {
    Calendar calendar =Calendar.getInstance();
    calendar.add(Calendar.YEAR,Y);
    calendar.add(Calendar.MONTH, M);
    calendar.add(Calendar.DAY_OF_MONTH, Date);
    calendar.add(Calendar.HOUR_OF_DAY, h);
    calendar.add(Calendar.MINUTE, m);
    calendar.add(Calendar.SECOND, s);
    time=(new SimpleDateFormat(("yyyy-MM-dd  HH:mm:ss:SS"))).format(calendar.getTime());
    return time;
  }
  public static boolean comparetime(String curtime,String furtime) {
    boolean bool=false;
    int res=curtime.compareTo(furtime);
    if(res<=0) {
      bool=true;
    }else if(res>0) {
      bool=false;
    }
    return  bool;
  }
  public static String getrdString() {
    String rd=RandomStringUtils.random(11, true, true);
    return rd;
  }
  public static String getrdnum() {
    String rd=RandomStringUtils.random(0, 2, 3, false, true);
    return rd;
  }
}