changing code at runtime in java

问题

Is there a way to change the code of the java at runtime?I need to read java file from jar, change the code, recompile it and put into the jar. All of this should be done at runtime. The part I dont knwo is how to read the java file as a java file from jar file and change the code

来源：https://stackoverflow.com/questions/11852954/changing-code-at-runtime-in-java