Repair Non Static Method Cannot be Referenced from a Static Context Java Error



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Many programmers are confronted with the error message “Non static method cannot be referenced from a static context” during coding. This error message is not specific and can occur in any IDE if the error conditions are met.

This is the error message:

Error: Cannot make a static reference to the non-static method getText(int) from the type Context

This is a very common error for beginners where the programmer tries to use a’static’ class without making an instance of the class. There are several conditions that must be met when using a static class. In this article, we will review several different cases and help you use a static class.

You cannot reference a static variable from a non-static method. To understand this, you must understand the difference between static and non-static.

Static variables are class variables, they belong to the class with only one instance, which is created only in first instance. Non-static variables are initialized each time an object in the class is created.

The essence of object-oriented programming, like Java is to encapsulate logic with the data it works on.

Instance methods are logic, instance fields are data. Together, they form an object.

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Static context

Context of the level of the library that is loaded into memory at runtime when the library is loaded. In this context, only VM variables, system variables (such as PATH, CLASSPATH), static methods (Math.ceil(), Math.abs()) and static variables (Math.PI, Math.E) are available. When objects are then created, the reference to them, MyObject myObject myObject, can be used to access the non-static methods defined in the MyObject myObject.callMyClassMethod() class. But if I had a static method in MyObject, public static void thumbsUp() { System.out.println(“Up”); } then I could call it anywhere I imported the MyObject class, import com.package.monObject via MyObject.thumbsUp(). Because at that time, it was loaded with the library!

Static Method

Method loaded with a class definition, accessible via a static access model, package.ClassName.MethodName. Part of the class definition, not the instance objects of the class, so always the same call. Useful for behaviours that do not require external variables or states, such as simple additions or transformations.

Without object, there is no instance data and although instance methods exist in the class definition, they need an object instance to provide them with data.

Theoretically, an instance method that does not access instance data could work in a static context, but there is no real reason why it is an instance method. It is a decision of linguistic conception to allow it anyway, rather than create an additional rule to prohibit it.

CONCLUSION

If these tips do not work, or if your code is different, you should keep an eye on the basic principles of static classes and methods, and review your code to ensure that the basic principle is not violated.

https://stackoverflow.com/questions/290884/what-is-the-reason-behind-non-static-method-cannot-be-referenced-from-a-static



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