原文:https://blog.csdn.net/qq_40010745/article/details/81032218 mybatis 根据id批量删除的两种方法 第一种,直接传递给mapper.xml 集合/数组形式 <delete id="deleteByLogic" parameterType = "java.util.List"> delete from user where 1>2 or id in <foreac
java单例的几种实现方法: 方式1: public class Something { private Something() {} private static class LazyHolder { private static final Something INSTANCE = new Something(); } public static Something getInstance() { return LazyHolder.INSTANCE; } } 方式2: public cla
/** * 普通thread * 这是最常见的,创建一个thread,然后让它在while循环里一直运行着, * 通过sleep方法来达到定时任务的效果.这样可以快速简单的实现,代码如下: * @author GT * */ public class Task1 { public static void main(String[] args) { // run in a second final long timeInterval = 1000; Runnable runnable = new