Java is an object-oriented programming language that has two characteristics: powerful functionality and simplicity. As a representative of static object-oriented programming languages, Java language perfectly implements object-oriented theory and allows programmers to perform complex programming with an elegant way of thinking. In the process of programming, you will call some tool classes. Do you know what tool classes are?
Tool class, as the name suggests, is the tool used. Add it wherever needed. When encountering a non-static tool class, you have to go to new when calling it. one time.
Those modified with static are all class members, and class members can be called directly. Those that are not modified with static must be called using objects of the class.
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