Prevent you from forgetting it every time you use it
1. Enter the path where the .java file is located
(cls clear console command )
2.javac compile
javac -d . demo1.java
javac demo1.java
such as The compiled file has a package name, javac -d . demo1.java
.class file will be generated in the cn/itcast/path path of the current path
If it is javac demo1.java command, the generated .class file is in the same directory as .java
3 .Run
java cn.itcast.path.demo1
without suffix.
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