How to get the current system time in java

Java method to get the current time of the system: get the current time and the time 30 seconds before the current time, the code is [SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");].

The operating environment of this tutorial: Windows 7 system, Java 10 version. This method is suitable for all brands of computers.

How to get the current system time in java:

import org.junit.Test;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import java.util.GregorianCalendar;
/**
 * @author ceshi
 * @Title: ceshi
 * @ProjectName ceshi
 * @Description: TODO
 * @date 2018/7/59:48
 */
public class JunitCalendar {
    @Test
    public void test(){
        //获得当前时间和当前时间前30秒时间
        SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        Calendar c = new GregorianCalendar();
        Date date = new Date();
        System.out.println("系统当前时间"+df.format(date));
        //设置参数时间
        c.setTime(date);
        //SECOND 秒 整数增加，负数减少
        c.add(Calendar.SECOND,-10);
        System.out.println("系统前10秒时间："+df.format(c.getTime()));
        //DAY_OF_MONTH 天 整数增加，负数减少
        c.add(Calendar.DAY_OF_MONTH,1);
        System.out.println("系统前1天时间："+df.format(c.getTime()));
    }
}

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