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Manage state with instance variables

Manage state with instance variables - Java教程

课程: Java 8+ Essential Training: Objects and APIs

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Manage state with instance variables

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- [Instructor] Just as with instance methods that belong to an instance of a class, there are also instance variables. A variable that's declared within a method is called a local variable. It's local to that method. So for example in this class InputHelper, I have a variable called scanner. It's an object, it's declared and used within the method and its reference expires when the method is done. In a non-static class, when you declare a variable that's in the class but outside of any methods, that's an instance variable. Like the method, it won't have the keyword static. Now, in this project, I've returned the InputHelper to its static state. That is the getInput method is static and can be called directly from the InputHelper class. And I have a starting Main method here. I'm going to create a new class in my utilities package that I'll call MathHelper. Within the MathHelper class, I'll declare a private variable starting with the keyword private, then the type, which will be int…

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