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原创 JNA之Callback回调

1、C函数typedef int(*func)(int a, int b);int init(func c) { return (*c)(1, 2);}2、Javapublic interface JNA extends Library { JNA instance = (JNA ) Native.loadLibrary("dllName",JNA.class); public interface Func extends Callback{ int invok

2021-02-26 00:05:00 2187 1

原创在staitc块中给static final赋值，若有异常，会有编译期异常Variable ‘UNSAFE‘ might not have been initialized。why？

在staitc块中给static final赋值，若有异常，会有编译期异常Variable ‘UNSAFE’ might not have been initialized。why？ private static final sun.misc.Unsafe UNSAFE; static { try { Field field = Unsafe.class.getDeclaredField("theUnsafe"); field

2020-11-18 21:38:56 702

原创 JDK7-hashmap源码

JDK7-HashMap1、简介 public static void main(String[] args) { // jdk7 : 数组 + 单向链表 HashMap<String, String> map = new HashMap<>(); map.put("k1", "v1"); // (k1,v1) => Entry System.out.println(map.put("k1", "v2"

2020-10-06 17:38:20 537 1

原创假设有 50 瓶饮料，喝完三个空瓶可以换一瓶饮料，依次类推，请问总共喝了多少饮料。

/* 假设有 50 瓶饮料，喝完三个空瓶可以换一瓶饮料，依次类推，请问总共喝了多少饮料。*/public static void main(String[] args) { int n = 50; //初始饮料总数 int i=0; //兑换次数 while(true){ n -= 3; //喝 3 瓶 n++; //兑换 1 瓶 i++; //兑换次数+1 if(n<3){ System.out.println ("共喝了"

2020-08-09 21:37:16 621

原创安装FastDFS的libfastcommon基础库时报错

安装FastDFS的libfastcommon基础库时，报如下错误。解决：执行如下。yum -y install zlib zlib-devel pcre pcre-devel gcc gcc-c++ openssl openssl-devel libevent libevent-devel perl unzip net-tools wget...

2020-01-04 20:25:27 1156

原创 Mybatis分页插件及其使用

springboot2.x集成pagehelper-spring-boot-starter.依赖：<dependency> <groupId>com.github.pagehelper</groupId> <artifactId>pagehelper-spring-boot-starter</artifactId&g...

2019-12-30 20:59:19 374

原创 Controller转发到Thymeleaf模板页面报错TemplateInputException异常

1、Controller@Controllerpublic class TestController { @RequestMapping("test") public String test(){ return "index"; }}2、templates/index.html<!DOCTYPE html><html lang...

2019-12-29 20:47:53 560

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