【java】【04】commons-lang3 操作字符串工具類 字符串拼接，日期加減得到字符串

代碼，字符串拼接，日期加減得到字符串

package com.br.doublelive.redis;

import org.apache.commons.lang3.StringUtils;
import org.apache.commons.lang3.time.DateFormatUtils;
import org.apache.commons.lang3.time.DateUtils;

import java.util.ArrayList;
import java.util.Date;
import java.util.List;

public class StringTest {

    public static void main(String[] args) {
        List<String> testList = new ArrayList<String>();
        testList.add("test1");
        testList.add("test2");
        testList.add("test3");
        System.out.println(StringUtils.join(testList, ","));


        Date now = new Date();
        Date addDays = DateUtils.addDays(now, -2);
        Date addMinutes = DateUtils.addMinutes(now, -2);
        Date addSeconds = DateUtils.addSeconds(now, -20);
        System.out.println(DateFormatUtils.format(now,"yyyy-MM-dd HH:mm:ss"));
        System.out.println(DateFormatUtils.format(addDays,"yyyy-MM-dd HH:mm:ss"));
        System.out.println(DateFormatUtils.format(addMinutes,"yyyy-MM-dd HH:mm:ss"));
        System.out.println(DateFormatUtils.format(addSeconds,"yyyy-MM-dd HH:mm:ss"));

    }
}

輸出

test1,test2,test3
2020-05-13 10:37:37
2020-05-11 10:37:37
2020-05-13 10:35:37
2020-05-13 10:37:17