The very common beginner mistake is when you try to use a class property "statically" without making an instance of that class. It leaves you with the mentioned error message.
You can ... |
Netbeans tells me it's bad to access a static method from a non static method. Why is this bad?
"Accessing static method getInstance" is the warning:
import java.util.Calendar;
public class Clock
{
...
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The following code is generating an error on the variable con2 saying "non-static variable con2 cannot be referenced from a static context Error." I Googled for a resolution and they ... |
I originally thought that static blocks were for static variables but the compiler allows both A and B to compile and run, what gives?
A
private static final Map<String,String> ...
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I know this question was answered before, but I cant still handle it with my code.
Please can someone pointing out how can I fix it on this particular code. Id like ... |
I cant get how to use/create oop code without word static. I read Sun tutorials, have book and examples. I know there are constructors, then "pointer" this etc. I can create ... |
I'm getting an error when I try to call a non-static method in a static class.
"Cannot make a static reference to the non-static method methodName() from the type playback"
I can't make ... |
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I ask that you ignore all logic.. i was taught poorly at first and so i still dont understand everything about static crap and its killing me.
My error is with every ... |
$ javac TestFilter.java
TestFilter.java:19: non-static variable this cannot be referenced from a static context
for(File f : file.listFiles(this.filterFiles)){
...
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First some code:
import java.util.*;
//...
class TicTacToe
{
//...
public static void main (String[]arg)
{
Random Random = new Random() ;
toerunner () ...
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hey i have problem with JDialogForm. I have created it using netbeans 6.8. That JDialogForm have textfield and button below it. and here is some code...
private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) { ...
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I know this error very well however this is the once time I'm stumped. I know that I can't call non-static variables from main method but this is confusing. Maybe you ... |
Just see the below codes
code 1
public class A {
static int add(int i,int j) {
return(i+j);
}
}
public class B extends A {
public static void main(String ...
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class Singer
{
String name;
String album;
public Singer(){
name="Whitney Houson";
album="Latest Releases";
}
public static void main(String[] args)
{
System.out.println("Name of the singer is "+name);
System.out.println("Album ...
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I've been trying to create a method (in a separate class) that takes a String as a parameter and uses a premade SoundEngine (a different class) object to play that file ... |
I'm trying to write this code to get the first initialCapacity prime numbers and then print them in sequence using java. It isn't working for two reasons, firstly I get the ... |
String name = "Marcus";
static String s_name = "Peter";
public static void main(String[] args) {
System.out.println(name);//ERROR
System.out.println(s_name);//OK
}
ERROR: Cannot make a static reference to ... |
package com.cordys.report;
import java.io.FileInputStream;
import org.apache.commons.codec.binary.Base64;
public class Encode {
public static String encodeFileStream(String filePath) //file path ex : C:\Program Files\Cordys\Web\reports\I0001180.pdf
{
try {
FileInputStream fin = new FileInputStream("E:/CSS Document/Test.pdf");
...
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package com.cordys.report;
import java.io.FileInputStream;
import org.apache.commons.codec.binary.Base64;
public class Encode
{
public static String encodeFileStream(String filePath) //file path ex : C:\Program Files\Cordys\Web\reports\I0001180.pdf
{
...
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I'm the only maintainer on a codebase where logging is done using Apache commons logging.
All classes contains these two imports:
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
Then a lot of classes contains non static log instantiation ... |
I have a class named Media which has a method named setLoanItem:
public void setLoanItem(String loan) {
this.onloan = loan;
}
I am trying to call this method from a class ... |
I'm trying to refer to a method in another class and use that in a return statement in my other class. At the moment, all I get is the following error: ... |
I have written the following code, but continually get a 'non-static method getText() can not be referenced from a static context' error.
Could someone help get me on the right track here?
public ...
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When trying to call on a method from another class my method as a error at
private class equalsButton implements ActionListener
{ // makes the equals button listener
...
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I would like to access a public integer from another class for use in a switch statement as below:
StateManager sm = new StateManager(0);
switch (localState) {
case (sm.ALL_COMPANIES_REQUEST): {
...
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I can't seem to find where I'm using a non-static reference in my static method, code is:
public class Item {
public static final Map ITEM_STATUSES = new HashMap();
static {
ITEM_STATUSES.put(STATUS_NEW, "New");
}
public ...
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I am making a program that can take judge scores and give an average and one of my variables I think I did wrong. I get the error message "non-static ... |
Why I cannot reffer? Do You know how to fix it? I would like to draw line by DDA algorithm.
Please help.
import java.awt.*;
import java.awt.event.*;
import java.lang.String.*;
import java.util.Scanner;
import java.io.IOException;
import javax.swing.*;
class Test extends JPanel {
...
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When I try to run this program, I get the above quoted error. Making makeHands static ends only in disaster, and making main non-static does nothing. What do I do?
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For some reason, when I try to call a non-static method from another class in an action, I get an error saying I can't call a non-static method in a static ... |
I would like to understand this once and for all.
With this please excuse the mass of code pasted below, but I do not want to leave out any details.
The only thing ... |
I am a Java newbie, so please bear with me and help.
I aim to first play then record sound.
I use netbeans IDE 6.8. Here is the code:
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.io.*;
import ...
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I researched this around and still can't seem to solve this problem. I have the following in my program:
public void InsertDB(double price, double shares, String ticker, int ...
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I was asked this question in interview and can't find a solution to it:
I have declared a list in my class. During its declaration, I haven't
made it ... |
I'm a little confused about this, and my browsing through the suggested answers on here didn't yield an immediate result that worked in my context.
My question is basic. let's assume ... |
I have a situation where i have to access a non static member from inside a static method. I can access it with new instance, but current state will be lost ... |
I'll preface this by saying that I've been a longtime fan of Stack Overflow, and over the past few semesters I've usually been able to find the answer to all my ... |
Is there any technique where you can use the return value of a non-static method from some class in a static method of some other class?
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I'm getting the Cannot make static reference to a non-static method error but I don't appear to be making a static reference.. my code is something like the following...
public void ...
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Possible Duplicate:
What is the reason behind “non-static method cannot be referenced from a static context”?
public void Sort(){
*some code*
}
public void displayResults()
{*more code*
}
public static ...
|
I apologize ahead of time if this code isn't formatted correctly, trying to paste instead of retyping each line. If it isn't right, can someone tell me an easy way to ... |
I have a code:
package why;
public class Foo
{
public class Foo1
{
String bar;
...
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@uhdam Take it easy; non-static variables belong to an object, an instantiation, of the class. If you don't have an object, you don't have it's non-static variable; e.g. a Person instance ... |
Let's start with the first error. Where is gradeTypePanel even defined? It looks like one of your classes, and I don't see it. It's referenced in your code, but there's no ... |
Just tell me either you are giving a request to that servlet from only one browser, because look static variable is same for all instances and other variable is different for different for different instances, but if you are requesting from a same browser then in your case you are incrementing both variables static and non-static simultaneously so it shows you ... |
I have been putzing around with Java using Eclipse. (And I like what I have seen so far.) I am confused by one thing, though. Every time I reference something (either a method or a variable) in the rest of the class from the main() method, it must be static. And evertyhing I reference from within those methods must also be ... |
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Hi, I was wondering which is best to use. I have a chess program that needs to use prestored arrays. I currently have these arrays in a separate class, with all of them static. Instead, I could make them non-static, and instantiate the class, thus calling them through the object name instead of class name. I'm basically looking for the fastest ... |
Here's the problem I hope someone can help. I'll just post the code and the error message, and maybe someone can lead me in the right direction. ----------------------------------------------------------------- A:\BankProgram\BankTeller.java:61: non-static method getAccountNumber() cannot be referenced from a static context Account.getAccountNumber(); ^ A:\BankProgram\BankTeller.java:62: non-static method deposit(double) cannot be referenced from a static context Account.deposit(getAmount); ^ 2 errors Tool completed with exit code ... |
Hello Coders J My program consist of several classes. I find it more readable,logic and useful to declare all the methods in all the classes static and get access by Class.member(). The problem showed up when I must use a java biuld-in method( as Component.remove ) within my static method , then I receive compile error. The first alternative is to ... |
hi there, its been a long time n have a question again.i want to know about the memory difference betwen a static n a non-static variable.how much memory they alocate n exactly wat difference is made when a static or a non static vriable is used.i mean what is the criteria for using a static or a non static variables.i hope ... |
It is my understanding that static methods can't access non-static methods or non-static instance variables, however I wanted to be sure I'm clear in the opposite case, specifically calling a static method from within a non static method. Also, I'm pretty sure static variables may be incremented from a non-static method, ie constructor(). So the question I think really has to ... |
Assuming Test is the name of a class that is accessible to main, you are *not* calling a method, you are creating an object. That's not a method invocation, it's an intance creation expression. The value returned from that call is a reference to the new object you just created. Since there is no left-hand side variable to contain this value, ... |
Khurram The basic difference is that static methods belong to the class while non-static ones belong to individual objects. The best example of static methods is in the Math class the methods in Math don't need a Math object to work, you just call the method and supply the arguments and the method does it job, there is no instance of ... |
If it is not static (ie: belongs to the whole class) then it must be called by a specific instance of the class. Therefore you need to create an instance of the class and use it to invoke the method. public static void main(String args[]){ MyClass myObj = new MyClass(); myObj.getId(); //gets the ID for this particular instance } Since the ... |
I will demonstrate my ignorance w/ this ? Im sure why doesn't this work public class Something(){ public static void main(){} Something something = new Something(); public void someMethod(){ otherClass.otherMethod(){} } class otherClass{ public otherMethod(){} } It keeps saying static method called from nonstatic, I know I am missing some grand philosophy of Java despite having read over and over again ... |
Hi, I have a question that's probably very simple but which is frustrating me to no end. Okay - I've got two objects, Job and JobCollection. Neither one has a "main" method. Job has 2 methods, setJobID and setJobName. JobCollection has 1 method, addJob. They're all 'public' w/ a 'void' return type. I made a separate class (with a "main" method) ... |
Hi All: Im have a question on referencing a class within a static method. I have the below code: public class Main { A atest; public static void main(String[] argv) { atest = new A(); } } class A { int i; } This code does not comile, it gives the error: non-static variable cl cannot be referenced from a static ... |
Maybe this will help. From a 3/99 JavaWorld article: Methods that don't manipulate or use the state of an object or class I call "utility methods." Utility methods merely return some value (or values) calculated solely from data passed to the method as parameters. You should make such methods static and place them in the class most closely related to the ... |
The concept of static is usually confusing for newbies, I know I was initially confused when I started to learn Java. The simple answer is: That error will occur if a block of code in a static method attempts to access a non-static variable (e.g. instance member) or call a non-static method. A brief explanation: Static fields and methods are part ... |
Steve, I agree with Mike, create an instance and call the method. Static methods should be reserved for CLASS functionality. The 'isSenior' method is really associated with an INSTANCE of Student. Also making 'isSenior' static would mean that it could only access static class variables and you have a reference to the instance variable 'creditsEarned'. Understand that static variables and methods ... |
Hello folks, I am getting this compile error "non-static variable this cannot be referenced from a static context". I have this class: public class Zoo { String name; String location; Zoo(String name, String location) { this.name=name; this.location=location; } } and from main would like to create an instance of the object Zoo -- thusly: Zoo SanDiego = new Zoo ("San Diego", ... |
Hi there, Look at the code and error text below. I have trouble in using keyword super, rest seems to be working well. Do you see any reason, why I can't use keyword super to access method "tune", but I am able to use parent class "Instrument". ie "Instrument.tune(flute);" Let me know, if you have any questions ? thanks siva class ... |
Welcome to JavaRanc, Jing Zhou! Concerning your question, what would it mean if you could access a non-static member from a static context? Why would you want to do such a thing? Note that from a static context, you can have a (static) reference to an instance of some object, and through that reference you can access members of the instance ... |
I have read several entries in books about the difference between static and non-static methods, but I don't understand what is being talked about. There are a couple of entries on this site I read through and don't understand either. Can someone explain the difference very thoroughly and simply? I have read that you don't need an object to call a ... |
I am getting the error message non-static variable clockwise cannot be referenced from a static context, when running the program code below. How do I counter this problem? The program below asks a user to input a probability and number of circles. The program then animates the input number of circles around a square of side 400 pixels. At each move ... |
I got a class in which I want to call three methods. The problem is as stated in the subject of this post. I got no clue whatsoever of what I should to to make it work. Anyway, heres the code: import java.util.*; public class and_kri { public static void main(String[] args) { String[] array1 = {"woe", "moe", "cloe"}; String[] array2 ... |
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Why does my editor (WSAD) care that I instantiate class SomeClass into object foo before I call the static method doSomething()? SomeClass foo = new SomeClass Foo.doSomething(); The warning that I get is the following: "the static method doSomething() from the type SomeClass should be accessed in a static way" I realize that the doSomething() method is a static/class method and ... |
For a static method to call a non-static method, the static method needs access to an instance of the class with the non-static method; i.e., ArConnectionPool pool = new ArConnectionPool(); pool.getConnection("foo"); Although based on the name of the class, it seems unlikely that you'll want to create an instance of a connection pool each time you access it -- most likely, ... |
The static block will be call only once and it will be the first time your are accessing the class. The non-static block will be call every time your are creating a new instance and it will be call just before the Constructor. here's a example and it's output public class StaticTest { public static void main(String[] args) { A a1 ... |
This is a general problem. Whenever you declare a method static, it applies without change to the class, the whole class and nothing but the class. So, whichever object you are coming from, it is exactly the same. So you can call a static method from an object ("non-static"), but not vice versa. If you call an instance method or instance ... |
I'm not getting the idea of "non-static method cannot be referenced from static context". before that chapter about static method and variable i've written and seen many codes where an instance calls a non-static method from inside the main() method. main() is a static method, right? so how can i call a non-static method from inside main()? I think something is ... |
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I don't believe you have given us enough of your code to point the exact problem for your situation. However, if you have one method that is not static, you cannot call it from another method which is static. public void myMethod() { } public static void anotherMethod() { myMethod() ///This isn't legal } If you made myMethod() static in the ... |
Deepthi, Welcome to JavaRanch! The answer is yes and no. A static method can only access static fields on that class. A non-static method can access both static and non-static fields on that class. And of course both methods could instantiate an instance of the object and access non-static fields on it. |
Hi, I was just not clear as to how does the compiler handle Static members. As far as fields are concerned if they are declared static, they are created on the HEAP and are shared by all the class instances. However, what i want to know is what happenes to the methods. I mean methods are just piece of code so ... |
It doesn't matter what type of method that is calling the static method is. The calling mechanism is the same. I can't think of a case where the method that gets called should ever care or need to know where the call is coming from. If you are calling the static method from outsize the class that the static method belongs ... |
hi guys, i been going through the theroy of static vs non static methods. from what i have read. static method cant access a non static method in the same class where else, a non static method able to. but from this example codes. i am thinking findAreaVersion1 is a static method as findAreaVersion2(Square sq) make use of the static method ... |
I can understand that static cannot be overridden by non-static. Example: Class A { static void m1() { Sysytem.out.print(" m1 in A "); } } Class B extends A { void m1() { Sysytem.out.print(" m1 in A "); } } Class test { public static void main(String ar[]) { A a = new B(); a.m1();// ----- (1) } } Here (1) ... |
package codes; public class SampleClass { //A nonstatic method void nonStaticMethod() { System.out.println("Inside nonStaticMethod"); } //A static method static void staticMethod() { System.out.println("Inside StaticMethod"); SampleClass objSampleClass = new SampleClass(); objSampleClass.nonStaticMethod(); //created object to call non static method //without creating an object instance methods cannot be accessed //these instance methods are members of instances //static methods are members of class. } public ... |
class DogTestDrive { public static void main(String[] args) { Dog one =new Dog(); one.size=70; Dog two=new Dog(); two.size=8; Dog three=new Dog(); three.size=35; one.bark(3); two.bark(2); three.bark(1); }//End main }//End class class Dog { int size; String name; void bark(int numOfBarks) { while(numOfBarks > 0) { if(size > 60) { System.out.println("Woof! Woof!"); } else if(size > 14) { System.out.println("Ruff! Riff!"); } else{ System.out.println("Yip! ... |
Hi , I have written a program in which i am trying to understand the static concepts . I have a doubt , can i access a static variable in a non static method. because when i am doing that it is executing properly ... please check the below import java.io.*; import java.lang.*; public class StaticExample{ private static int cal=1; private ... |
okay, some background info. I'm trying to implement the interface MySet using arrays. One of the methods in MySet is boolean isIn(int v). This method searches the set and returns true if 'v' is in the set. I'm implementing MySet with the class MyArraySet, so boolean isIn(int v) is in MyArraySet. //main declarations and other coding. Value is an int that ... |
The main() method is a static method, whenever you access any non-static methods or variables from a static method then either those methods or variables should be static or can be accessed through instance of the class. Only static methods and variables could be accessed directly. for Example in your case: Replace this line with init(); in main method new Temperature().init(); ... |
Hello, I created a GUI using the Netbeans framework. From that interface I have a JButton, and within the actionPerformed method of that button is the following code. The main() method is in the same class. I tried moving it ( main() )to another class, and calling setVisible() from there to fire up the interface, hoping to have some effect on ... |
Hi all, My current assignment is to modify a previous assignment for reading and partially solving Sudokus. We're supposed to move the display function of the original file into a new class, SudokuConsoleObserver, and implement the Observer design pattern in order to solve it (among other things I haven't gotten to yet...) I've created SudokuObservable, ObserverApplication, and SudokuConsoleObserver, and SudokuObservable requires ... |
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As I have been working on this program, I keep running into static issues. My latest static error is: BenHultinProg2.java:29: non-static variable hw4 cannot be referenced from a stat ic context double totalPPoints = hw1.getPPoints() + hw2.getPPoints() + hw3. getPPoints() + hw4.getPPoints(); ^ BenHultinProg2.java:34: non-static variable lGrade cannot be referenced from a s tatic context lGrade = totalEPoints / totalPPoints; ^ ... |
Hi everybody I am Krishna, as a beginner I have few doubts, when I was coding, I referred a non static variable from static function, then I got a compile time error saying cannot refer to a non static context from static context. Can anybody tell me why I cannot do so. I made a search before asking this question, but ... |
I get the same Java Error in at line 21: cannot make static reference to non-static Integer for this line: Integer intResult = new Integer.parseInt(result); //error: cannot make static reference to non-static Integer or I tried using the primitive type int: int intResult = result; //error: cannot make static reference to non-static Integer but really I need to get it to ... |
Okay, I am developing an app for school. I have an abstract super entitled Student, and three concrete public subs called Undergraduate, Graduate, and PartTime. All of these are in separate files, but are in the same package. In the super, I have multiple abstract methods such as add();. In the subs, I implement them with public void add() {...method body...}. ... |
class sample18 { static int a =10; } class sample17 { int b = 5; public static void main(String args[]) { sample18 s1 = new sample18(); //b = sample18.a; // this won't compile sample17 s2 = new sample17(); s2.doSomething(); (new sample17()).b = sample18.a; // this would } public void doSomething() { b = sample18.a; // this would } } |
Hey guys, I am just trying out 'simple' Java techniques for practise and I am already stuck. Don't worry about the code itself in terms of efficiency etc, I just want to know why this doesn't work. I know I can change the 'add' method to static but I done that in a previous program and nearly all my methods were ... |
Static would mean there is only one instance of the member throughout ALL instantiations of the class. Therefore within a class named "Car": static int wheels = 4; No matter how many Car objects you create, there will be only one wheels instance. If you wanted each car object to have its own name, you would make String name = "Mazda" ... |
The initialization of static members like "a" happens in a static method named "", specially created by the compiler to hold such code. So you are, indeed, calling getNumber() from a static method. Most likely your real code is more complex, but in this case, since all getNumber() does is provide access to a static member, why can't it be static? ... |
I'm getting this error I know that I can't get to the non static method in that class so how do I use it?mainProgVideoStore.java:80: non-static method newCVideo(java.lang.String,int) cannot be referenced from a static context Customer.newCVideo(title, vAmount); import java.io.*; import java.util.*; public class mainProgVideoStore { static Scanner console = new Scanner(System.in); public static void main(String[] args) { VideoList videoList = new VideoList(); ... |
NetBeans is giving me the following error on the line "int cx = child.y;" : (line #13) non-static variable x cannot be referenced from a static context Can someone explain why I am getting that error? Thank you. class child { int y = 12; public void testIt() { System.out.println("x is blank"); // parent p = new parent(); //System.out.println("x in parent ... |
C:\Users\cc11rocks\Documents\JavaCrap\Pong>javac Pong.java Pong.java:64: non-static method nextBoolean() cannot be referenced from a static context initdir = Random.nextBoolean() ? "left" : "right"; ^ Pong.java:65: non-static method nextBoolean() cannot be referenced from a static context upslashdown = Random.nextBoolean() ? "up" : "down"; ^ Pong.java:73: non-static method nextBoolean() cannot be referenced from a static context initdir = Random.nextBoolean() ? "left" : "right"; ^ Pong.java:74: non-static ... |