qq_39119348的博客

eclipse弹出polling news feeds has encountered a problem问题解决：打开eclipse，然后windows->preferrnces->general->News->取消勾选Enable automatic polling news这个选项

格式化输出String.format("GID: %s, UID: %d, TYPE: %d,KEY: %s",groupId,userId,type,key); StringBuilder、StinrgBuffer类——对字符串进行修改多数StringBuilder，StinrgBuffer类（线程安全）StringBuilder sb = new StringBuild...

Java String、StringBuilder、StinrgBuffer类 1、String转换成intString str = "129";int n = Integer.valueOf(str);//int n = Integer.valueOf(str).intValue(); 2、判断字符串是否为数字//方法一：用JAVA自带的函数public sta...

Spring Boot AOP 不生效1.未导入包<dependency> <groupId>org.aspectj</groupId> <artifactId>aspectjrt</artifactId></dependency><dependency> <gr

这是一道面试时的手撕代码：二叉树结点结构包含指向父结点指针，对其进行中序遍历（直接对遍历的结果进行输出），要求空间复杂度 O(1)图片来源于https://blog.youkuaiyun.com/jcx517266098/article/details/79878697（前序遍历）二叉树结构class TreeNode{ int val; TreeNode left;...