Error Non-static Variable This Cannot Be Referenced From A Stat
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Non Static Variable This Cannot Be Referenced From A Static Context Inner Class
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just like you, helping each other. Join them; it only takes a minute: Sign up non-static variable this cannot be referenced from a static context [duplicate] up vote 16 down vote favorite 2 This question already has an answer here: Non-static variable cannot be referenced from a static context 10 answers I'm new to Java from non static method cannot be referenced from a static context java error Ruby background, I made a simple code to test the class and object of Java public class ShowBike { private class Bicycle { public int gear = 0; public Bicycle(int v) { gear = v; } } public static void main() { Bicycle bike = new Bicycle(5); System.out.println(bike.gear); } } it gives me an error in the compiling process: ShowBike.java:12: non-static variable this cannot be referenced from a static context Bicycle bike = new Bicycle(5); ^ 1 error any idea? update after reading all the helpful answer here, I feel the static nested class behave the same as a class in a different file in the same package test/Bicycle.java package test; public class Bicycle { public static int wheels = 2; public int gear = 0; public Bicycle(int v) { gear = v; } } test/Launcher.java package test; public class Launcher { public static void main(String[] args) { Bicycle bike = new Bicycle(5); System.out.println(bike.gear); System.out.println(Bicycle.wheels); System.out.println(bike.wheels); } } Am I correct on this point? java
here for a quick overview of the site Help non static field cannot be referenced from a static context android Center Detailed answers to any questions you might have Meta how to access non static variable in static method java Discuss the workings and policies of this site About Us Learn more about Stack non static method cannot be referenced from a static context android Overflow the company Business Learn more about hiring developers or posting ads with us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question http://stackoverflow.com/questions/15331846/non-static-variable-this-cannot-be-referenced-from-a-static-context x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 4.7 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up Emergency: “error: non-static variable this cannot be referenced from a static context” [duplicate] up vote -2 http://stackoverflow.com/questions/30850807/emergency-error-non-static-variable-this-cannot-be-referenced-from-a-static-c down vote favorite This question already has an answer here: Non-static variable cannot be referenced from a static context 10 answers I have 4 hours to complete my exercise but I get multiple "cannot be referenced from a static context" errors. Here are these in full: MainApp.java:281: error: non-static variable this cannot be referenced from a static context list.addMouseListener(this); ^ MainApp.java:289: error: non-static method setBounds(int,int,int,int) cannot be referenced from a static context setBounds(300, 300, 350, 150); ^ MainApp.java:292: error: non-static method getContentPane() cannot be referenced from a static context Container cp = getContentPane(); ^ MainApp.java:299: error: non-static variable this cannot be referenced from a static context button1.addActionListener(this); ^ MainApp.java:326: error: non-static method pack() cannot be referenced from a static context pack(); ^ MainApp.java:328: error: non-static method setDefaultCloseOperation(int) cannot be referenced from a static context setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); ^ MainApp.java:330: error: non-static method RentShop(String,Catalogs,DefaultListM
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 http://javarevisited.blogspot.com/2012/02/why-non-static-variable-cannot-be.html is most popular method among all beginners and they try to put program code there they face "non-static variable cannot be referenced from a static context" compiler error when they try to access a http://javatalks.ru/topics/7636 non static member variable inside main in Java 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; cannot be public static void main(String args[]) throws IOException { 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 cannot be referenced and its value remains same for all instance. static variable initialized when class is 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
Source проект РегистрацияВойтиАнглийскийРусскийУкраинский×Статьи javatalksКонференция javatalksНаш Open Source проект Как бороться с ошибкой non-static variable this cannot be..?Форум/Язык Java/Основы языка Javaanchor17 ноя 2008 05:22JavaBeginnerСообщения:136Уже заколебала вот эта ошибка:non-static variable this cannot be referenced from a static contextНе пойму, чё с ней делать надо?Это из-за того, что я пытаюсь из main'a вызвать что-то, что не объявлено статическим. Объявлять эту переменную статической - не выход, потому что из вызвав из какого-то нестатического метода статическую переменную - выдаёт ту же фигню.Подскажите пожалуйста, как бороться с этой ошибкой?Я из мэйна выделил всё в отдельный класс, который не статический и в мэйне сделал так:MyClass = new MyClass()вот оно и ругается... А как сделать, чтобы не ругалось?anchor17 ноя 2008 06:08VurnСообщения:1224 public class SomeClass { int var = 10; public static void main(String[] args) { SomeClass sc = new SomeClass(); System.out.println(sc.var); } } anchor17 ноя 2008 07:55JavaBeginnerСообщения:136Сорри, намёка не понял :)Точнее я совершенно не понял зачем мы будучи в классе SomeClass создали экземпляр самого же себя.. Как рекурсия прям :)А если у меня уже есть: public class SomeClass { public static void main(String[] args) { куча кода, который желательно куда-то деть, потому как все переменные объявлены как static... } } Как нужно выделить вот эту кучу "мешающегося" кода со статиками? В отдельный класс?Я выделил её в отдельный класс, примерно так получилось: class ClassA { public static void main( String[] args ) { JFrame frame = new JFrame("My Program"); .......... ClassB myClassB = new ClassB(); } class ClassB { public ClassB() { // сюда я пер