Non-static Variable Cannot Be Referenced From A Static Context Error
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Non-static Variable This Cannot Be Referenced From A Static Context New
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Non Static Field Cannot Be Referenced From A Static Context Android
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Non-static Method This Cannot Be Referenced From A Static Context
referenced from a static context up vote 102 down vote favorite 44 I was taught poorly at first, and so I still don't understand everything about static. My error is with every single variable that I declare and then try to use later inside my methods, I get the "non-static variable cannot ..." error. I can simply put all the rough coding of my methods inside non static method cannot be referenced from a static context java error my cases, and it works, but then I cannot use recursion. What I really need is someone to help on the syntax and point me on the right direction of how to have my methods recognize my variables at the top, like compareCount, etc.: public class MyProgram7 { public static void main (String[]args) throws IOException{ Scanner scan = new Scanner(System.in); int compareCount = 0; int low = 0; int high = 0; int mid = 0; int key = 0; Scanner temp; int[]list; String menu, outputString; int option = 1; boolean found = false; // Prompt the user to select an option menu = "\n\t1 Reads file" + "\n\t2 Finds a specific number in the list" + "\n\t3 Prints how many comparisons were needed" + "\n\t0 Quit\n\n\n"; System.out.println(menu); System.out.print("\tEnter your selection: "); option = scan.nextInt(); // Keep reading data until the user enters 0 while (option != 0) { switch (option) { case 1: readFile(); break; case 2: findKey(list,low,high,key); break; case 3: printCount(); break; default: outputString = "\nInvalid Selection\n"; System.out.println(outputString); break; } // End of switch System.out.println(menu); System.out.print("\tEnter your selection: "); option = scan.nextInt(); } // End of while } // End of m
cannot be referenced from a static context? "non-static variable cannot be referenced from a static context" is biggest nemesis of some one who has just started programming and that too in Java. Since main method in java is most popular method among how to access non static variable in static method java all beginners and they try to put program code there they face "non-static variable cannot non static variable cannot be referenced from a static context netbeans be referenced from a static context" compiler error when they try to access a non static member variable inside main in Java non static method cannot be referenced from a static context android which is static. if you want to know why main is declared static in Java see the link. public class StaticTest { private int count=0; public static void main(String args[]) throws IOException { http://stackoverflow.com/questions/2559527/non-static-variable-cannot-be-referenced-from-a-static-context count++; //compiler error: non-static variable count cannot be referenced from a static context } } Why non static variable can not be called from static method Now before finding answer of compiler error "non-static variable cannot be referenced from a static context", let's have a quick revision of static. Static variable in Java belongs to Class and its value remains same for all instance. static variable initialized when class is http://javarevisited.blogspot.com/2012/02/why-non-static-variable-cannot-be.html loaded into JVM on the other hand instance variable has different value for each instances and they get created when instance of an object is created either by using new() operator or using reflection like Class.newInstance(). So if you try to access a non static variable without any instance compiler will complain because those variables are not yet created and they don't have any existence until an instance is created and they are associated with any instance. So in my opinion only reason which make sense to disallow non static or instance variable inside static context is non existence of instance. In summary since code in static context can be run even without creating any instance of class, it does not make sense asking value for an specific instance which is not yet created. How to access non static variable inside static method or block You can still access any non static variable inside any static method or block by creating an instance of class in Java and using that instance to reference instance variable. This is the only legitimate way to access non static variable on static context. here is a code example of accessing non static variable inside static context: public class StaticTest { private int count=0; public static void main(String args[]) throws IOExce