Swing/AWT/SWT :: Non-final Variable Inside Inner Class Defined In Different Method

Aug 9, 2014

this code won't compile because selected row must be declared as final because of it being defined outside the window listener. Is their anyway around this? If I make it final the first time that the variable is called it keeps it starting value until the GUI is closed.

butEdit.addActionListener (new ActionListener () {
@Override
public void actionPerformed (java.awt.event.ActionEvent evt) {
int selectedRow = table.getSelectedRow ();
final String [] values = custTableModel.getRowValues (selectedRow);

[code]....

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Cannot Refer To Non-final Variable Inside Inner Class Defined In Different Method

Apr 3, 2014

Created a java.sql.connection object. Refering those obj inside public void run() { } If i declare as final inside a method, i can't refer those outside method due to scope. Cannot refer to a non-final variable dbConnObj inside an inner class defined in a different method...

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What Happens To A Static Variable That Is Defined Within A Method Of A Class

Feb 15, 2014

What happens to a static variable that is defined within a method of a class ?

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Can A Class Be Defined Inside Interface

Feb 15, 2014

Can a class be defined inside an Interface .

interface Inter{
class x{
public static void main(String[] args){
System.out.println("Hello World!");
}
}
}

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Swing/AWT/SWT :: How To Tie Member Variable Inside And Outside Of ChangeListener

Mar 9, 2014

I have a Tcr object as a member variable of the JFrame. But When ChangeListener swings into action, the variable inside it are all nulls. the TcrPanel is created before the ChangeListener is triggered.

Tcr tcrPanel;
tabbedPane.addChangeListener(new ChangeListener() {
@Override
public void stateChanged(ChangeEvent e) {
if (e.getSource() instanceof JTabbedPane) {
CloseButtonTabbedPane pane = (CloseButtonTabbedPane) e.getSource();

[Code] ....

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Error Passing Value Of A Variable From One Class To Main Method Of Another Class

Jan 8, 2014

I've 3 classes.

1. Circle
2. GetInputFromUser
3. testCircle

package ABC;
public class Circle {
private double radius;
public double getRadius() {
return radius;

[Code] .....

In the testCircle class, in the line: getRadius = ui1.GetInput();

It's showing the error: The method GetInput(float) in the type GetInputFromUser is not applicable for the arguments ()

And when I do: getRadius = ui1.GetInput(rad);

It's showing the error: rad cannot be resolved

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JSP :: Variable Defined In One Scriptlet Not Visible In Another

May 25, 2011

I'm having an issue when I try to define a variable in a JSP scriptlet, and then in a separate scriptlet on the same page attempt to use the variable. It looks like it goes out of scope.

I also cannot reference a variable from a servlet in a JSP expression tag. So I've had to write the entire page basically in one scriptlet.

I'm using Tomcat 6.0.

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Is It Correct To Declare A Class Inside Main Method

Jan 21, 2014

I saw an example where an (inner)class is declared inside the main method, this is correct or not and why/when it's reasonable to use?so smth like this

public class myClass()
{
public static void myMethod(myInnerClass obj)
{
if (obj.method())

[code]....

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Performing Method On Instance Inside Abstract Class

Mar 12, 2015

How do I create an instance of a class in a method?

I am a bit rusty whenever I think of instances. I always think of main method and objects when I see instance which gets me confused on what to do when I am not in a main method. The example:

I have a abstract class, School, and inside School I have some methods that must preform some action on an instance. For example, there is a move() method that must move the instance of School. Another method named, personOld(), which returns whether or not an instance of School surpassed some determined age.

How do I do this and create this instance?

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Difficulties With User Defined Variable In Multiple Methods

Apr 9, 2015

I'm trying to build a program that will output what will ultimately look like a simple mario level turned on its side. As part of my output I need the user to define what mario looks like. I do this using Scanner and save the input to String mario. When I try to use that variable in another method it gives me troubles.

import java.util.Scanner;
public class Mario2

public static void mario() {
//user defines mario
String mario = ">->O";
Scanner keys = new Scanner(System.in);
System.out.println("What does mario look like?");
mario = keys.next();
System.out.println("Mario now looks like: " + mario);
 
[code]....

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When Final Variable Occupy Memory

Sep 23, 2014

when final variable occupy memory in java?

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How To Take Runtime Value For Static Final Variable

Jul 28, 2014

How can i take run time value for static final variable...my lecturer said first time assignment is possible for declared final variable but in my case it shows compile time error..I'm placing my program below with error message

class Sample
{
static final String cname;
void print() {
System.out.println(cname);
}
public static void main(String args[])
{
cname=args[0];
Sample s=new Sample();
s.print();
}
}

Sample.java:11: cannot assign a value to final variable cname.
cname=args[0];

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Write A Statement That Reads User Input Integer Into Defined Variable

Jan 20, 2015

so i'm following a java tutorial from the book and it has a few challenge questions. and i'm stucked on one. i think i just don't understand what is it that its asking me. heres the question, Write a statement that reads a user's input integer into the defined variable, and a second statement that prints the integer. assuming scanner is given, and i checked my heading code is ok.
 
Scanner scnr = new Scanner(System.in);
int userNum = 0;
System.out.println("What is the product of 8 time 2");
userNum = scnr.nextInt();

[code]....

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Static And Final Variable / Field - Functional Difference?

Sep 15, 2014

I'm not really sure I understand the functional difference between a static and final variable/field. Oracle defines Class Variable as:

Class Variables (Static Fields) A class variable is any field declared with the static modifier; this tells the compiler that there is exactly one copy of this variable in existence, regardless of how many times the class has been instantiated. A field defining the number of gears for a particular kind of bicycle could be marked as static since conceptually the same number of gears will apply to all instances. The code static int numGears = 6; would create such a static field. Additionally, the keyword final could be added to indicate that the number of gears will never change.

If static will have the same value regardless of how many times it's used, then why use final (or vice versa)?

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Access Getter / Setter Of Bean Class Where It Defined As Member In Another Class?

Feb 18, 2014

Class UserAssessBean{
private String username;
private int userid;
private ArrayList<ModuleBean> module;
--{get/set}--

[Code] ....

How can i access the getters/setters of module bean, when it was returned as array list in UserAssessBean?

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How To Get Access To The Method With A Parameter Of Class Type Variable

Feb 19, 2014

how to get an access to the method with a parameter of class type variable, lets say: public void insert(Record newRecord, int pos)?

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Class Defined Under Another Class - Sorting Elements In Reverse Order

Jul 4, 2014

I have never seen a class defined under another class ....

class pe{
static class pqsort implements Comparator<integer>
public into compare(Integer one,Integer two)
return two-one;
}
}

First I want to know how class pqsort is defined under class pe ....

And how the comparator used in this example is sorting elements in reverse order

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Extending Static Inner Class Defined Within Inheriting Class?

Jul 3, 2014

I am working on a project involving a class that has the attributes of one of its inner classes. Now, if possible, I would like to make it so that the inner class is not visible outside of the class. Also, some of the functional mechanics require that the class be an instance of the nested inner class (it extends the inner class). The following code snippet demonstrates the situation.

public class A extends A.B {
public static class B { //ideally I would like this to be private/protected.
}
}

When I try to compile this program, I get the error message "Cyclical inheritance involving A." This error does not make much sense because, since the inner class "B" is static, it requires no instance of "A" (it does not inherit from "A" or uses it). My question is "Is it possible to do something similar to this structure?" I have searched many forums in search of the answer but have not found anything that attempts to explain it. The closest problem that I have found is one relating to the inheritance of a nested inner class from another class. I would like to express that the problem that I am having involves a class defined within the inheriting class.

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Pass Private Final Class Object To Another Class Constructor

Aug 28, 2014

can we pass private final class object to another class constructor?

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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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What Is The Impact Of Declaring A Method As Final

Nov 14, 2014

1 Can method declared as final be overridden and overloading ?

2 if A is static sub class of B. how to access a method in class A ?

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ArrayList Contains Method Does Not Work On User-defined Data Types

Sep 1, 2014

I am trying to remove the duplicate elements from ArrayList using .contains() if elements are primitive datatype it works but user-defined datatype does not work.

public class UserBean {
String name;
String address;
public String getName() {
return name;

[code]....

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Define All Local Variables And Method Parameters As Final?

May 16, 2015

I am using findbugs and PMD as a code analyser. I am keep getting warnings to use local variables and method parameters as final.

I want to know if its a good practice to keep them final or what to do?

Sometime i have a private method which is 1 line longer. Sometime it is annoying to use final.

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Program That Implement Final Method And Perform Arithmetic Operation

Mar 4, 2014

class A
{
public final int Add(int a,int b) {
return a+b;
}
}

class B
{
public static void main (String args[])
{
System.out.println(Model.Add(5,10));
}
}

This is what I have. I'm not sure if this even makes use of a final method. But when I run it I get an error saying cannot find symbol for line 13.

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Why Interface Inherit All Non Final Methods From Object Class

Jan 8, 2014

why interfaces inherit prototype of all the non final methods of the object class in itself? Object class is parent class of all the class and Interface is not the class.

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String Class Private Final Character Length

Feb 27, 2015

The String class stores the characters of the string internally as a private char[] and calling someString.length() results in getting the length field from the character array. I am looking to get the details on how the length is implemented. I understand it is a field, but in the original question I provide sample code and really want to know if/how the resulting byte code may differ when compiled, perhaps I am just not seeing the simple answer through my confusion.

Link ....

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