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Create and use instance methods

Create and use instance methods - Java教程

课程: Java 8+ Essential Training: Objects and APIs

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Create and use instance methods

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- [Instructor] I've previous described how to use static methods that are called from a class without the class first being instantiated. In this code I have a method named getInput that's defined in the class InputHelper. I call the method from the class itself. I'll take a look at that method by control clicking Windows or command clicking on Mac, and I see that the method has the keyword static, and that's what allows the method to be called in this way, but frequently a method needs to work with persistent data that's stored within an object, then it's known as an instance method, that is a method that belongs to an instance of the class rather than to the class itself. Static methods are marked with the keyword static. Instance methods simply don't have that keyword. So if I delete the keyword static, this method now must be called from an instance of the InputHelper class, not from the class. I'll go back to the main class, and I see that there's now an error indicated, and it's…

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