java获取当前时间和时间比较大小

Ａ获取当前时间：

　

Java代码
import java.text.SimpleDateFormat;
import java.util.Date;

public class GetCurrentTime {
/*获得当前时间*/
public static String getCurrentTime(){
Date currentTime = new Date();
SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
String dateString = formatter.format(currentTime);
return dateString;
}

}

import java.text.SimpleDateFormat;
import java.util.Date;

public class GetCurrentTime {
/*获得当前时间*/
public static String getCurrentTime(){
Date currentTime = new Date();
SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
String dateString = formatter.format(currentTime);
return dateString;
}

}
Ｂ时间比较大小：

Java代码
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar;

public class TimeCompare {
/*时间比大小*/
public static int timeCompare(String t1,String t2){
SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
Calendar c1=Calendar.getInstance();
Calendar c2=Calendar.getInstance();
try {
c1.setTime(formatter.parse(t1));
c2.setTime(formatter.parse(t2));
} catch (ParseException e) {
e.printStackTrace();
}
int result=c1.compareTo(c2);
return result;
}

}