java_基础 - YUHAO-ZX/StudyCollection GitHub Wiki

1.获取类加载的路径(排查包冲突问题)

StopWatch.class.getResource("").getPath();
result:file:/Users/niceday/.m2/repository/commons-lang/commons-lang/2.6/commons-lang-2.6.jar!/org/apache/commons/lang/time/

2.AtomicBoolean

AtomicBoolean b = new AtomicBoolean(false);
if(b.compareAndSet(false,true)){
   //初始化工作
}

此效率比synchronized，快至少3倍

3.android热修复

原理：获取classLoader进行动态替换
工具：tinker
链接：https://github.com/baidao/tinker-manager