LocalDateTime 转String

要将LocalDateTime类型转换为String类型，可以使用DateTimeFormatter类进行格式化。以下是一种实现方法：

import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;

public class Main {
    public static void main(String[] args) {
        // 指定日期格式
        DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss");

        // 获取当前日期时间
        LocalDateTime now = LocalDateTime.now();

        // LocalDateTime转String
        String dateStr = now.format(formatter);
        System.out.println("LocalDateTime转换为String后的结果：" + dateStr);
    }
}

在上面的代码中，我们首先创建了一个DateTimeFormatter对象，用于指定日期格式。然后，使用LocalDateTime.now()获取当前的日期时间。接下来，使用format方法将LocalDateTime对象转换为String类型，将其存储在dateStr变量中。最后，我们将结果打印出来。

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