mvn clean
mvn compile
# linux
mvn exec:java -Dexec.mainClass="com.zhong.Experi1"
mvn exec:java -Dexec.mainClass="com.zhong.Experi2"
# windows
mvn exec:java -D"exec.mainClass"="com.zhong.Experi1"
mvn exec:java -D"exec.mainClass"="com.zhong.Experi2"
郭晶晶的第三次实验