Swing/AWT/SWT :: SetLayout Does Not Override Or Implement Method From Super Type?

Sep 12, 2014

I am trying to make a ChessBoard class composed of an array of JLabels inside a JPanel with a grid layout. I am also trying to override the getPreferredSize method so that the board will change size when I resize the main window (in another class in which I will instancize this class as part of a larger GUI). I got this kind of layout working before, but now I am trying to get it to work with multiple classes. However, after copying in the part of the previous code corresponding to the panel's layout, I am encountering some errors that I don't know how to solve. Specifically, when I try to override the getPreferredSize method, the compiler tells me "method does not override or implement a method from a super type, " and that it can't find the method "getPreferredSize"

Here's my code:

public class ChessBoard extends JPanel//the panel that this class extends is the boardHousing
{
//mental chess board piece array
Piece mentalBoard[][] = new Piece[8][8];
//actual GUI chessboard JLabel Array
static JLabel chessBoard[][] = new JLabel[8][8];

[Code] ....

I would just think that I was overriding the method incorrectly, but the weird thing is that I got that specific section of code to work before -- the only thing different now is that there are multiple classes, so my ChessBoard class itself is extending JPanel.

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Swing/AWT/SWT :: Error At Class Name - Type JTextField Must Implement Inherited Abstract Method

Oct 27, 2014

This code is directly from Swing: I'm using Eclipse and keep getting an error on line 10 saying :

"The type JTextField must implement the inherited abstract method ActionListener.actionPerformed(ActionEvent)."

import java.awt.FlowLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JTextField;
import javax.swing.SwingUtilities;

[Code] ......

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Trying To Implement Interface - The Method DoSomething Is Undefined For The Type B

Dec 2, 2014

Let's say we have situation like this:

abstract class A
class B extends A
class C extends B
class D extends C implements SomeInterface

I'm trying to implement a method "doSomething" declared in SomeInterface in class D. While trying to call doSomething in main I get the error message ”The method doSomething is undefined for the type B”

This is my code i main:

B container = new D("1,2,3,4,5,6,7,8");
System.out.println(container.doSomething());

I need container to be an object of type B, because it goes later into a list of type B. According to what I've been told, the only file I need to edit to make this work is class D.

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Implement Equality And HashCode Method If Class Has Reference Type Members?

Jan 16, 2015

I am trying to implement the following example to override the equality and hashCode method if the class has reference type member. I do get the expected result "true" for equal and "false" for non-equal objects. But the print statement in the Circle's equal method is not executed when the objects values are not equal. I don't know what i am missing, though i get the equality result "false" as expected for non equal objects.

class Point{
private int x, y;
Point (int x, int y) {
this.x =x;
this.y = y;

[code]....

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Override The Clone Method?

May 14, 2014

the clone method of the object class is protected, so therefore we have to override this method I understand this. What doesn't make sense to me is that the protected access modifier gives access to classes in the same package and subclasses. Isn't every single class we make a subclass of the Object Class?

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Object Method Override

Mar 7, 2014

I read the following comment at stackoverflow.com. It is not clear to me why equals in the code below does not override - i looked up Object class equals() and the signature is same.

public class Foo {
private String id;
public boolean equals(Foo f) { return id.equals(f.id);}
}

This class compiles as written, but adding the @Override tag to the equals method will cause a compilation error as it does not override the equals method on Object.

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How To Know Order Of Method Which Override Or Not

Dec 29, 2014

I have some codes as below:
 
public class Hello
 {
  public static void main(String[] args) {
  new Student().fun();
  }
}
class Person

[Code] ....
 
Now the output is "Person". if i hide the "PRIVATE" in class PERSON, that is, method PRINT in class STUDENT override the same method in its father class, then the output is "Student". Why? I mean, how does the program know what PRINT method should be called?

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Can't Override A Method - It Still Ask For Level 1.5 Or Greater

Apr 29, 2014

I'm using "standard-kepler-SR2-win32-x86_64" and have installed "jdk-8u5-windows-x64".

But eventhough I can't override a methode like that "@override", it still says me:"annotations are only available, if source lever is 1.5 or greater".

Fine, therefore I installad "jdk-8u5-windows-x64", its the higest one on that oracle side, what else is needed?

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Override Equal And Hashcode Method

Jul 7, 2014

I read this tutorial about overriding equal and hashcode method. [URL] ....

I understand how to override equal method, by overriding it, We can custom our compare. I also understand How to override hashcode, To make custom hash.

But still I can not understand why we do it? why if equal method override, we must override hashcode method too?If we don't what is the problem?

To honor the above contract we should always override hashCode() method whenever we override equals() method. If not, what will happen? If we use hashtables in our application, it will not behave as expected. As the hashCode is used in determining the equality of values stored, it will not return the right corresponding value for a key.

Is it the right reason in order to override:

Because when we customize equal method so it focus on special variables,We must change the hash code too in order to match with it, so hashcode also focus on those special variable.

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Each Class Should Override The ToString Method

Nov 10, 2014

Write TestCabAppointment,java class where you will instantiate new CabAppointment objects and read data from RandomAccessFile and create CabAppointment objects and save them in RandomAccessFile You may use FixedLengthStringIO,java class, ICabAppointmentRecord.java interface. Complete the ReadWriteRandomAccessFile.java

CabAppointment.java (this class extends Appointment class)
private int id;
private Address startAddress;
private Address destinationAddress;
private String terminal;
private String description;

[Code].....

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How To Override Comparing Method To Sort By Runs

Mar 16, 2015

I have an ArrayList, based on the class which stores cricket players, their names and runs scored.When I use the Collections.sort() method my arraylist is sorted alphabetically by forename.how to OverRide the comparing method to sort by runs, and thus the code I use to sort the list?

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Swing/AWT/SWT :: Relationship Between Super And Child?

Aug 27, 2014

I want to make an application and must use strategy pattern my idea is to create a super class in this case Movie Player and three sub classer and they'll komminesera with each other using strattegy pattern, one of the sub classes is Button Panel and I want to add it to Movie Player and it was to be its child,so how can I add the butt panel to Movie Player and it shall be its children?

MoviePlayer:
import java.awt.BorderLayout;
import java.awt.Component;
import java.awt.FlowLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import com.github.sarxos.webcam.WebcamPanel;

[code]....

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Implement Type Of Container

Mar 15, 2014

I want to implement a kind of "container" in which to store objects (instances) of different types. Then with an iterator I'd call common methods. This is what I have in mind:

Java Code:
with(Positionables){
translate(2, 0, 4);
} mh_sh_highlight_all('java');

Where translate(x, y, z) is a method common for objects in Positionables which objects are of different types (Sphere, Box etc.).

Now I was thinking Positionables could be a List<Positionable> and Positionable is an abstract class and Sphere and Box extends from it. But I don't know how to propagate the call of translate() to the subclasses.

What are the best approaches for this matter? It would be perfect if I could make it so I could somehow use the "with" construction like in the example above.

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Implement A Set Abstract Data Type Using Singly Linked Lists

May 6, 2015

I am trying to implement product method below which returns the set representing the Cartesian product of the current set and a given set (the Cartesian product contains all ordered pairs (a, b) where a belongs to the current set, and b belongs to the given set). The product should be a ListSet <Tuple<E>> object where each ordered pair is a Tuple element. (I have a Tuple class which implements an ordered tuple)

What am I trying to do in the product method : Make 2 for loop and inside the for loop make an array of <E> then set the 2 elements of the tuple then again set tuple and add it to arrayList. how to set 2 elements of the tuple and set tuple ??

public class ListSet<E> implements Iterable<E>{
SinglyLinkedList<E> sl;
public ListSet(){
sl = new SinglyLinkedList<E>();

[code]....

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Implement Functionalities Of Set Class Using A Private Data Member Of Type ListReferencedBased

Feb 9, 2015

Okay, I am supposed to implement the functionalities of the Set class using a private data member of type ListReferencedBased<E>,how the ListReferenceBased works with what I am trying to accomplish.I am trying to complete Set.java, and I have barely started and much of the code doesn't work. ListReferenceBased was given to me completed.

import java.util.Iterator;
pubic class ListReferenceBased<E> implements ListInterface<E>, Iterable<E>{
/** reference to the first element of the list */
private Node<E> head;
/** number of items in list */
private int numItems;

[code]....

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Set Method Return Type Determined Inside Method

Dec 25, 2014

I need to write a method that will consume string representation of Object type and will return one object of this type. How to set return type for the method in this case?

Here is exmaple :

public <?> identifyType(String typeString){
if (typesString.matches("String")){
return new String("");
}else if (typeString.matches("Integer")){
return new Integer(0);
}
//....etc..}

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Which Two Method HashMap Key Object Should Implement

Jul 25, 2014

Which two method HashMap key object should implement?..

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Implement Method Named ViewAllFactor

Jan 14, 2014

so, i have a problem in implement method named viewAllFactor(User us,ResultSet rs)when i call this method using <T> like objet dont work because T obj is nulli ask if i can try something to have a good result.

I have 2 classes BaseDao<T> (DAO Pattern) and Class User extends from BaseDao

this is the code

package appweb.core;
public abstract class BaseDao<T> {
public ArrayList<T> viewall() {
ResultSet rset = null;
ArrayList<T> listAll = new ArrayList<T>();
String sql = "SELECT* FROM "+ this.tableName;
System.out.println(sql);
try {
 
[code]....

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Implement Method Inside Interface

Sep 3, 2014

if i call a class that implements an interface the method inside the interface will be triggered automatically by the compiler or happens only in the observer pattern? i keep simple to be surr the message came across, a typical example would be a listener on a button, or a collection that calls comparator)

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Implement Add Method For Singly Linked List

Apr 26, 2015

Implementing the add(int i, E o) method for a SinglyLinked List.

public void add(int i, E o)
// pre: 0<=i<= size()
// post: adds ith entry of list to o

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Implement Hash Of Hashes As Method Parameter

Apr 28, 2015

I have a drop-down which contains the four sections simple buttons(filters). When click any of these buttons some settings are applied. I have successfully auotmated it using simple if else and switch but in that case i have to use 8 parameters(8 are the number of button)

public void editFilters(WebElement filter1, WebElement filter2, WebElement filter3, WebElement filter4,WebElement filter5,WebElement filter6,WebElement filter7,WebElement filter8 String edit, String expectedColour) {
switch (edit) {
case "selectFilter":
if (filter1 != null) {

[Code] .....

But want to make it more effective by using hashes. I do not want to use 8 different parameters to perform action on the respective button.

So now what i want to implement.

Create a method in which i pass the parameter1 as hash and 2nd parameter as 0 or 1, 0 means unSelectFilter and 1 means select the filter.

With parameter 1, in code i want to pass the name or xpath or anything else for any number of filters , that those filters names should be stored into that hash and then by passing 0 or 1, i can select/unselect those filters.

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Call Method In All Objects Which Implement Certain Interface

Apr 15, 2015

if some of you worked with Unity Game engine (C#) the idea is that game has main loop and once per cycle it call for example Update() method in all objects which implement certain interface.

I would like to repeat such pattern in Java for another another program, not even game related, but I would still need a main loop and event driven behaviour with async call backsSo question is how to implement the fallowing scenario:

Imagine i have interface which implement some methods and one of them is Execute()

I have the main controller class which implement main loop, also multiple other classes which implement the same interface with method Execute(). How can i call this Execute() method on all objects which implement that interface each loop cycle?

Should i keep and track reference of each object which was implemented with this interface and go through inner "for" loop trough each reference and call manually Execute() method in each of them?what if each object implementing interface have to run Execute() method simultaneously? in parallel independent from each other?

Referring back to Unity engine and their Update() method - there is exactly the same situation:you can have multiple objects with script attached, thats script implement interface which has multiple methods and one of them is Update() and once per cycle all objects with that Update() method will be executed in parallel independently

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Java Interface - Implement Method In Another Class

Sep 17, 2014

So I created an interface which has the method

int getCalls();

I am trying to implement this method in another class but I'm not sure how to do so. My attempt is:

public getCalls(){ return getCalls(); }

When I run the program it sends the following exception:

Exception in thread "main" java.lang.StackOverflowError
at FibonacciForget.getCalls(FibonacciForget.java:14)
and it highlights the [return getCalls();] part.

What is the correct way to implement the getCalls() method?

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Swing/AWT/SWT :: How To Implement ActionListener

Feb 7, 2014

I have a class with jbutton declared inside like these:

public class UI{
private JFrame ventana;
private JTable table;
private JPanel panel;
private JScrollPane tableScrollPane;
private JTextField aBuscar;

[Code] .....

I would like to add actionlistener in my JButton's. Where must I declared these listener. How should I do these?

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Swing/AWT/SWT :: How To Implement JTextArea In Netbeans

Apr 20, 2014

I have dragged and dropped a jTextArea from netbeans palette onto my form. But when I right clicked for Event > action > actionPerformed for implementation, I realized such was not there, unlike the jTextField component. For example, I have tried this but it didn't work:

//{
Import java.swing.*;
JTextArea txa = new JTextArea();
txa.getText(jTextArea1);
txa.setText(jTextArea1);
txa.setTextWrap(true);
//}

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Swing/AWT/SWT :: Implement The Median Filter?

Jun 10, 2014

I have to implement the median filter. I found an example on the internet but it does not run, I do not see the image

public void median_RGB(Immagine img) {
int maskSize = 3;
int width = img.getW();

[Code]....

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