kernel oopsObject-Oriented Programming Concepts are very important for programming. Without having an idea about OOPS concepts, you will not be able to design systems in the object-oriented programming model. 面向對象的編程概念對于編程非常重要。 如果不了解
Java shutdown hook are handy to run some code when program exit. We can use java.lang.Runtime.addShutdownHook(Thread t) method to add a shutdown hook in the JVM. 程序退出時,使用Java shutdown鉤子可以方便地運行一些代碼。 我們可以使用java.lang.Runtime