Static Method Accessing Non Static Method

Oct 6, 2014

class Test
{
static Test ref;
String[] arguments;
public void func(String[] args)
{
ref.arguments = args;

[code]...

This code run perfectly.But the static method is acessing a non static method which was supposed to be not possible.

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Accessing Static Method In Another Class

Apr 6, 2014

I am getting an error trying to access a static method of another class...theyre both in the same package, I've tried importing the class.

I've tried to do A b=new A()
and then
b.evaluate();

Everything that I try I get the following error:

Exception in thread "main" java.lang.NoClassDefFoundError: B$A
Caused by: java.lang.ClassNotFoundException: B$A
at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
at java.lang.ClassLoader.loadClass(ClassLoader.java:247)

Code :

public class A{
public static String evaluate(String op) {
}
}
public class B{
String output=A.evaluate(input);
}

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Servlets :: Cannot Make Static Reference To Non-static Method GetQuery From Type Resource

Mar 26, 2015

This is my code inside the method:

@Post
public static String getDetails(Representation entity) throws Exception {
String customerId = getQuery().getValues("cus_id");
}

I use this code in Restlet Representation. I try to get the value from the Request API. But I am facing the problem as "Cannot make a static reference to the non-static method getQuery() from the type Resource".

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Can Static Method Return Instances Of Same Class In Special Case Where Everything Is Static?

Jun 27, 2014

From what i understand static methods should be called without creating an instance of the same class . If so why would they return an instance of the same class like in the following : public static Location locateLargest(double[][] a) , the Location class being the same class where the method is defined . I don't understand this , does it mean that every field and every method in the class must be static ? Meaning that you cannot have instances of the class because everything is static . Or it's just a mistake and the class Location cannot have a static method: public static Location locateLargest(double[][] a) ?

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Update User - Cannot Make Static Reference To Non-Static Method

Apr 26, 2015

I can't figure out what this error message "Cannot make a static reference to the non-static method getEndUserCharge(long, long, long, long) from the type UpdateUserWS" actually means.

The error is coming from:

public void updateDetailsPackage() {
some unrelated code
long zero=0;
double endUserCharge=0;
endUserCharge = UpdateUserWS.getEndUserCharge(long zero, long zero, long zero, long zero); <-------- error is here

[Code] ....

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Player Class - Cannot Make Static Reference To Non-static Method

May 26, 2015

Alright, I have two classes, this one

public class Player {
private String player;
public String getPlayer() {
return player;
}
private int strength;
private int defense;

[Code] .....

However, it says that under Player.getPlayer() that it 'Cannot make a static reference to the non-static method'.

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Instantiating Class With Non Static Variables From Within Static Method

Oct 28, 2014

Why I can create an Instance of a class that contains non static variables within the static main method ?

This program runs fine

import java.util.*;
public class Test{
public int j;
public static void main(String[] args) {
Test test1=new Test();
System.out.println(test1.j);

[Code] .....

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Non-Static Method Cannot Be Called From Static Context Errors

Jul 27, 2014

I'm working on a banking program that is supposed to use 3 classes (Account-base class, CheckingAccount, and SavingsAccount) and several methods to display the banking information (ID, balance after a withdrawal and deposit, and the annual interest rate). This should be a pretty simple program, but I'm getting hung up on one portion of it. I'm getting some compiler errors, all of which deal with non-static variables being called from a static context (I'll also post these errors following the code). Up until the middle of last week, we just declared everything as static, but that's changed and I'm having trouble figuring out when to and when not to use static when declaring my methods, hence the compiler errors.

import java.util.Date;
public class Account {
private int id = 0;
private double balance = 0;
private double annualInterestRate = 0;
private Date dateCreated = new Date();

[Code] ....

Here are the compiler errors I am receiving:

Compilation completed. The following files were not compiled:
6 errors found:
File: C:UsersHiTechRedneckDesktopSummer II 2014Computer Programming PrincipleProgram 5CheckingAccount.java [line: 7]
Error: non-static method getId() cannot be referenced from a static context

[Code] .....

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How To Have Static Or Non-static Method Reference As Parameter

Nov 18, 2014

I had a TestColor class which contained methods to change hue, saturation, brightness, red, green, blue of TestColor's instances but also had static methods which take in an additional parameter for an instance of TestColor and returns the affected instance of TestColor. Now instead of having one method for every possible color effect to be applied to an image, how can I have one method that takes in an Image parameter, a static or non-static method reference from TestColor parameter and lastly an intensnity value parameter. This is so that I can make an affectedImage object instance inside the method and a Graphics2D object for drawing to each pixel of the new image, now I have one for loop and one nested for loop for the x and y pixels of width and height of the old image and inside the nested for loop I'd create a TestColor by calling getRGB on the image's pixel. Then I would apply the static or non-static method reference somehow to change the color with the intensnity value and after applying it draw to the new Image with Graphics2D. How to would I parametize a method reference and be able to use it in such way?

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Threads Calling Static And Non-static Method

Jul 14, 2014

One class having two method one as static n another as non-static, 2 threads are there t1 is accessing the static method and t2 the non-static method is it possible n both are sharing the same object.

I now we have two kinds of lock one is object level lock and another is class level lock

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Non-static Method Cannot Be Referenced From Static Context

Feb 1, 2015

I am trying to compile the following code where the entry point is Main.java but i am getting the following error "Error non-static method add(int[]) cannot be referenced from a static context in Java " ....

If i add the keyword static in add method of A.java it works properly......

Class Main.java code
package com.company;
public class Main {
public int [] a= new int[]{1,2,3};
public static void main(String[] args) {
Main n= new Main();

[Code]...

Both the classes are in same package

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Calling A Non Static Method From Static Method

Jun 24, 2014

We know that a non static method can not be directly refrenced from static method but in the example given below there is no such error.Why?

class A
{
private void display()
{
System.out.println("In A");
}

public static void invoke (A x)
{
x.display();

[code]....

In above case a non static method display() is being invoked from static method invoke ()but it is not giving error.why?

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Static Method Or Static Block

Sep 8, 2013

Which is more efficient static block or static method ?

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Why Global Var Initialized With Static Method And Not By Other Static Global Var Declared After Its Usage

Jul 27, 2013

Take this:

class test
{
static int i=j;
static int j=10;
.....
 
this will give illegal forward reference ....
 
but this will compile successfully ..
 
class test
{
static int i=test1();
static test1()
{
return 20;
}
}
.....
 
plz assume we have main method in both cases ..
 
java would be loading all static members first and would be assigning default values .. and then will be running all the initializers from to bottom ..Why second case is a compile success and not first .. as in second also test1 method is declared after its usage ..

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Set Method To Static?

Oct 23, 2014

I'm writing a program that calculates phone charges. I have my class is set up, but when I try to retrieve data from it in my main, eclipse says that I need to set my method to static, which messes up the rest of the program.

Class:

public class MobileCharges { 
private double charges;
private int minutes;
private String plan;

[Code].....

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Can A Static Method Be Overridden

Aug 26, 2014

can a static method be overridden?

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Why Is Main Method Static

Oct 1, 2014

in java why main method is always static in nature...

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Overriding Static Method

Aug 30, 2011

class One
{
public static void doStuff()
{
System.out.println("One");
}
}

class Two extends One

[code]....

My understanding of static says that static methods cannot be overrriden but the compilation of the above code results in Overriding rule violation error.

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Final And Static Method?

Feb 7, 2014

My teacher has asked me one question that "What is difference between the final method and static method".

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Static Method Related

Jan 31, 2014

Book says static methods can not access object instance variables. But the following code successfully prints out

ba.balance = 10
instance var = 5.

It seems like Static method is able to access the instance variable of another class, as well as the instance variable of main class. What gives ?

class InitProcess {
public static void main(String[] args) {
mymethod();
}
int x = 5;

[code]....

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Catching Array From Static Method

Apr 16, 2015

I'm writing a code with a cellphone class to set price, brand and serial number. I'm also, in the main method, initializing 100 different cellphone in a matrix style ( up to here I'm fine). I have to use a copy constructor to define some cellphones ( fine too). Another thing I had to do was to generate random numbers and swap the price of the cellphones ( which I'm fine with too). My problem lies after using my static method. I have to display a new matrix with the changed price and return the counter that I used in my method to see how many times it was changed.

My two problems are that if I display my array again after I ran the method, it stays the same ( I didn't "catch" the change so I'm guessing the compiler just didn't keep them in the array). Secondly, I don't know how to return the counter. I don't have any ".getCounter" or something ( what I'm used to). Any input?

My formatting is terrible, I'm trying to improve it no need to point it out

Here's my code:

import java.util.Random;
//Cellphone Class ( apart from main method)
class Cellphone {
private String brand;
private long serialNumber;
private double Price;
//declaration of variables in cellphone class
 
[Code] ......

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Void And Static In Main Method?

Jan 7, 2014

What does void and static mean in the main method?

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Understanding Concept Of Static Method

Jun 13, 2014

I know that static method cannot use non-static methods .Then how the following code works ,where main method is static and this main method calls go() method which is a non-static method .

import javax.swing.*;
import java.awt.event.*;
public class SimpleGuib implements ActionListener {
JButton button;
public static void main(String[] args) {
SimpleGuib gui = new SimpleGuib() ;
gui.go() ;

[code]....

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Invoking Static Method With Array

Apr 16, 2015

I'm writing a code with a cellphone class to set price, brand and serial number. I'm also, in the main method, initializing 100 different cellphone in a matrix style ( up to here I'm fine). I have to use a copy constructor to define some cellphones ( fine too). Another thing I had to do was to generate random numbers and swap the price of the cellphones ( which I'm fine with too). My problem lies in my static method. I coded it all, but I can't seem to invoke it on the cellphone.

Basically, the method has to search for cellphones in the array with the same price, swap the price, print it out, and keep a counter of the price swap it has made. But I can't seem to invoke it on eclipse. It keeps telling me it is undefined for the class cellphone ( the method modifyCellPhone)

Here's the code:

import java.util.Random;
class Cellphone {
private String brand;
private long serialNumber;
private double Price;
public Cellphone (String br, long sN, double Pr) {

[Code] .....

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Local Inner Class In A Static Method

Jun 22, 2014

is it necessary that inner classes inside a static method be static . If yes Why?

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Use Logger Class With Static Method

Sep 11, 2014

A common solution to this problem is to write a utility class whose responsibility is to log information. This class can have a flag that will allow you to turn the logging on and off. In addition you should be able to tell the class how much detail you want in the output. Ultimately, this class will give you the ability to control when information is logged, what information is logged, how often information is logged, and even where the information is logged. And you would be able to control all of this without changing a single line of code!

This type of utility class is commonly written using static methods and is referred to as a static class. In order to use the features of a utility class, the application can access the methods directly by referring the class name, eliminating the need to create an instance of the class in order to execute the methods.

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