Java classloader机制测试命令
cd /d E:\Study\Java\ThreadStudy\ThreadStudy\src\
javac HelloLoader.java
java cn/hacker/cas/FindClassOrder
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cd /d E:\Study\Java\ThreadStudy\ThreadStudy\src
javac cn\hacker\cas\FindClassOrder.java
java -Xbootclasspath/a:E:\Study\Java\ThreadStudy\ThreadStudy\src\ cn/hacker/cas/FindClassOrder
java -Xbootclasspath/p:"%JAVA_HOME%"/jre/lib/rt.jar;E:\Study\Java\ThreadStudy\ThreadStudy\src\HelloLoader.jar cn/hacker/cas/FindClassOrder
Java类的热替换:https://www.ibm.com/developerworks/cn/java/j-lo-hotswapcls/index.html