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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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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Alright, I have two classes, this one

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

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Feb 4, 2015

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Apr 1, 2014

I have an admin class that needs to access a method of another class and I'm unsure how to do it.

One of the methods in the admin class (DancerAdmin) accesses a .txt file with information in and each line is to be extracted and is to be created as an object of the Dancer class. The information in each line is to then be used to set the variables in the Dancer class.

To set the values the Dancer class has setter methods which I need to access each time a new object is created while cycling through the .txt file. I'm struggling to access these methods from the DancerAdmin class when I run the relevant method.

The snippet of code I have from the method in DancerAdmin is

while (bufferedScanner.hasNextLine()) {
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I get an error saying non static method setName cannot be referenced from a static content?

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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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Nov 18, 2014

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Take this:

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this will give illegal forward reference ....
 
but this will compile successfully ..
 
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plz assume we have main method in both cases ..
 
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(this is just the header of the class... And this is my second class, which contains an ArrayList of the first class:

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And this is my third class which contains an ArrayList of the second class:

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What I want to do is, know how many of footballers are there in the league? Meaning how many of "f"s are in the "ft"... I remember from C++ it was easy, you just did it something like this: ft.f[i]; (where i is a position), then you'd go through each of them, if you wanted to do something with them, or just ask for it's length, if you needed to know how much footballers are there.

I'm trying this method to get the size of the array in the 2nd class, from the 3rd class (containing an ArrayList of classes of 2nd class, but no luck:

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I'm getting this: Array required, but ArrayList<FootballTeam> found ---

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Oct 19, 2014

What I want to do is this, this is my first class:

Java Code:

public class Footballer {
int goals;
String surname= "";
String team="";
private static int counter=0;
private int dres;
} mh_sh_highlight_all('java');

(this is just the header of the class, just how it looks)...

And this is my second class, which contains an ArrayList of the first class:

Java Code:

public class FootballTeam{
String teamname="";
String league="";
ArrayList<Footballer> f;
} mh_sh_highlight_all('java');
And this is my third class which contains an ArrayList of the second clas:
Java Code: public class FootballLeague{
String leaguename="";
ArrayList<FootballTeam> ft;
} mh_sh_highlight_all('java');

What I want to do is, know how many of footballers are there in the league? Meaning how many of "f"s are in the "ft"... I remember from C++ it was easy, you just did it something like this: ft.f[i]; (where i is a position), then you'd go through each of them, if you wanted to do something with them, or just ask for it's length, if you needed to know how much footballers are there.

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