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JDK环境变量adb 环境变量123456789sudo touch ~/.zshrcsudo vi ~/.zshrc复制export ANDROID_HOME=/Users/m/Library/Android/sdkexport PATH=$ANDROID_HOME/platform-tools:$PATHexport PATH=$ANDROID_HOME/tools:$PATHexport P

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Application OnCreate() 12345678910111213141516171819public static void main(String[] args) { Looper.prepareMainLooper(); //创建消息循环 ActivityThread thread = new ActivityThread();

堆内存细分现代垃圾收集器大部分都基于分代收集理论设计，堆空间细分为： Java7 及之前堆内存逻辑上分为三部分：新生区+养老区+永久区 Young Generation Space 新生区 Young/New 又被划分为Eden区和Survivor区 Old generation space 养老区 Old/Tenure Permanent Spac

Colletion容器继承图 https://www.jianshu.com/p/31ed50ab01e3 Java ListList <– ArrayList LinkedList ArrayList ```ArrayList arrayList = new ArrayList<>(); 12345 得到一个object数组 `private static fi