年少有为

public class RepeatBase { public static int[] num = {1,0,8,4,5,6,2,8,1,6}; public static void main(String[] args) { // System.out.println(repeatCheckB Read More

1、二分法查询 public static void main(String[] args) { int[] array = new int[]{1, 4, 3, 2, 6, 5, 8, 9, 7}; int target = 9; boolean flag = findTarget(target, Read More

最近在整理代码时，遇到数据库变更，向数据库添加记录，中文读取或存入时变为？？？。本地MySQL数据库的字符集设置的是utf-8，IDE中项目的字符集也是utf-8，所以在切换数据库之前未发现问题。遇到这个问题后排查了一段时间，最后是在MySQL连接数据库url的参数中加了characterEncod Read More

1、String 与 list 相互转换 List<String> str = new ArrayList<>(); str.add("small");str.add("sun");str.add("shine"); String joinStr = String.join(",", str); S Read More

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pom依赖 <dependency> <groupId>org.projectlombok</groupId> <artifactId>lombok</artifactId> <version>0.10.2</version> </dependency> 创建或修改对象新玩法 import lomb Read More

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1、java8 Map的新用法 Job job = new Job("李四","语文",98); Job job1 = new Job("李四","数学",85); Job job2 = new Job("王五","语文",90); Job job3 = new Job("王五","数学",84); Read More

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1、回访问题上、下排序sql语句 UPDATE table_bank bank join table_bank visit on (bank.id = 1 and visit.id = 23) or (bank.id=23 and visit.id =1) SET bank.order_no = v Read More