Java时间日期格式转换 String、Date、LocalDateTime三者互相转换

Java中String、Date、LocalDateTime三种时间类型互相转换，直接上代码！

        String replaceDate = "2021/1/25 09:00";
        
        //String转Date
        DateFormat format = new SimpleDateFormat("yyyy-MM-dd HH:mm");
        Date dateTime = format.parse(replaceDate);
        System.out.println("将字符串转换为Date ---->  "+dateTime);
        System.out.println("--------------------");
        
        //Date转String
         SimpleDateFormat sformat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");//日期格式
        String StringDate = sformat.format(dateTime);
        System.out.println("Date类型转换为字符串String ---->   "+StringDate);

        
        //Date转 LocalDateTime
        LocalDateTime DateToLocal = dateTime.toInstant().atOffset(ZoneOffset.of("+8")).toLocalDateTime();
        System.out.println("将Date转换为LocalDateTime ---->   "+DateToLocal);

     
       //String转 LocalDateTime
        DateTimeFormatter dateTimeFormatter = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss");
        LocalDateTime finalTime = LocalDateTime.parse(StringDate,dateTimeFormatter);
        System.out.println("将String转换为LocalDateTime ---->   "+finalTime);
        System.out.println("--------------------");

     
		//直接生成localdatetime类型系统时间
        System.out.println(LocalDateTime.now());
      
       //LocalDateTime转String        
     LocalDateTime now = LocalDateTime.now();
     String StringTime = now.format(DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss"));