java 获取当前时间的三种方法_java获取单层文件夹大小

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;

}

}