I have defined a subclass of DefaultMutableTreeNode Class in java :
public AccountsTreeNode extends DefaultMutableTreeNode {
}
in this class I have a recursive method called getsorted(ArrayList list_) , which accummulated the list_.
In this method, I have to call this.children() which returns the children of the node, but the children are all of type "DefaultMutableTreeNode". I have to call the method getsorted on these children,but since the getsorted is a mehtod of AccontsTreeNode, it gives me runtime cast error.
Should I convert children to AccountTreeNode type by overriding the children() method?
I have defined a subclass of DefaultMutableTreeNode Class in java :
public AccountsTreeNode extends DefaultMutableTreeNode { }
in this class I have a recursive method called getsorted(ArrayList list_) , which accummulated the list_.
In this method, I have to call this.children() which returns the children of the node, but the children are all of type "DefaultMutableTreeNode". I have to call the method getsorted on these children,but since the getsorted is a mehtod of AccontsTreeNode, it gives me runtime cast error.
Currently after a treenode is edited using the editCustomerItem component, the entire RichFaces tree is updated and reRendered. Is it possible to only reRender the specific TreeNode that was edited instead of the entire Tree? The tree gets very large and we're looking to optimize the reRender process.
I've looked and attempted the nodeSelectListener attribute of the tree combined with the ajaxKeys/ajaxNodeKeys attribute, but they always failed with the
'java.lang.IllegalStateException: No tree element available or row key not set! at org.richfaces.model.TreeDataModel.isLeaf(TreeDataModel.java:296) at org.richfaces.component.UITree.isLeaf(UITree.java:534) at org.richfaces.renderkit.NodeRendererBase.initializeLines(NodeRendererBase.java:156) at org.richfaces.renderkit.html.TreeNodeRenderer.doEncodeBegin(TreeNodeRenderer.java:101)'.
How do you test a default constructor in one class and then test it in a different class? This is the code for the Person class which has the default constructor. I'm not sure in the PersonTester class how to access this default constructor and how to test it - what I have so far for the second class is also below.
class Person { // Data Members private String name; // The name of this person private int age; // The age of this person private char gender; // The gender of this person
The LocalStudent class inherits the Student class. The IDE states an error of "no default constructor in Student class".I understand that if a LocalStudent object is created, the default constructor of its superclass (aka Student class) will be called implicitly.there is no LocalStudent object being created, so why is the default constructor of Student being called ?
The default constructor of LocalStudent is also overloaded by the created no-arg constructor containining subjects = null; . So there is no call to the superclass default constructor from the default constructor of LocalStudent.
public class Student { private char year1; public Student(String name, char year){ year1 = year; } public char getYear(){ return year1;
Will I'm tying in my code to set a default number for the JTextField that when the user decide not to put any numbers. Like let say that I want the textfield set to 0 , so then the user do not file it it won't make any problem to the program because its already has a default number.
Note: This is a small part of my code. when I leave it empty it take the 0 as a value, However, when I write in text field it also take the value of a 0 and the finalTotal is also = to 0.what I'm doing wrong.
class Course { String courseName; } class Entry { public static void main(String[] args) { Course c = new Course(); c.courseName="java"; System.out.println(c.courseName); } }
I have defined these two classes under same java project in Eclipse IDE with no package. Above two class are having default classes. class Course is also having a instance variable courseName with default access. So when we try to compile the Entry class it will give the errors while accessing the instance variable courseName on Line 6 and 7. As both the classes are having default access modifier. class Course is not visible to class Entry, then why we do not get any compilation error while creating the object of class Course on line 5?
I was just wondering.. my understanding from everywhere I have read is interface cannot be private or protected (not at the top level) but when we declare an interface without any modifier it is default.
We know default modifier has more restricted access than protected.. public > protected > default > private
Now since an interface can be public and default then why not protected as clearly if they were allowed to be protected they could be implemented by a subclass..?
While typing this question I figured how would an interface know which is it's subclass? that is why Java allows only public i.e. any class can implement it or default i.e. any class within the package can implement.. am I right?
public static void main(String... args) { String i; // String i = null; that would compile if (i == null) {// this line does not compile as i was not initialized System.out.print("A"); } else { System.out.print("B"); i = "A"; main("A", "B"); } }
Why does the above code not compile although the statement String i should lead to an initialisation of i to the value of null which is the default value for Strings.
I want to programmatically change the default program which an extension is opened in. So .resantic extensions for example to run in my jar file when I double-click on it. I know i need a bat file or exe file because i can't directly run the jar file. But i was wondering if its possible to run it if its an executable jar file. Else i can just make a bat file that runs my program. Also how can i on double click send the path to the file that was clicked in the args[] array so i can open the actual file aswell instead of just opening the program?
In the following code the print method prints the default value of int(zero) for the first time even when the variable i has been assigned a value of 4. Why?
class A1{ A1() { System.out.println("Inside constructor of A1()"); print(); } void print() { System.out.println("A");
[Code] ....
Output: Inside constructor of A1() 0 Inside constructor of B1() 4
I am facing difficulties in identifying the proper way to add the selected colors of cards into an arraylist. I am having an arraylist which is:
Java Code: private List<String> selectedCars = new ArrayList<String>(); mh_sh_highlight_all('java'); And one more for the carColors:
Java Code: private List<String> carColors = new ArrayList<String>(); mh_sh_highlight_all('java');
The selectedCards array will store the selected cars ['TOYOTA','MAZDA','NISSAN'] as per the selection from the user.For certain types, there is one default color which is 'Black', however for some of them, the user can select different colors.(ex. if selection is 'Toyota') Java Code:
String carColor=""; String toyotaColor=""; // The value will be retrieved from the form once the user selected the color if (selectedCars.contains("MAZDA")) { carColor="Black"; } else if (selectedCars.contains("TOYOTA")) { carColor=toyotaColor;
I am writing a program that accepts input from the user, I want default values displayed before the input values.
Java Code:
public surfboards() { surfboardType = "Type not assigned"; shaperName = "Shaper not assigned"; constructionType = "Construction Type not assigned"; surboardSize = 0D; } mh_sh_highlight_all('java');
I can get the output to display as shown below
(THIS IS WHERE I WANT DEFAULT CONSTRUCTOR DISPLAYED. Currently not displayed)
Type not assigned Shaper not assigned Construction Type not assigned 0 Feet
(THIS IS WHERE I WANT DEFAULT CONSTRUCTOR DISPLAYED. Currently not displayed)
input:
Java Code: Enter Surboard Type: test Enter Shaper Name: test Enter Surfboard Construction Medium: test Enter Surfboard Size: 6.5 mh_sh_highlight_all('java');
I just recently started learning about encapsulation, how to set variables private and only accessible to other classes through setters() and getters(). I've seen a couple of programming examples, perhaps not enough but some from here, and I sort of built the assumption that by default all variables need to be private. to make things more clear, here's a card dealer I made which simply
1- generates a fulll deck of 52 cards 2- lets user decide how many players, with 5 as Max number allowed as each player is dealt 10 cards. 3- deal cards
I approached this by making A deck , card , player and game class
import java.util.ArrayList; public class Deck { //an Object of this Class would generate a full deck ie an ArrayList of 52 Cards private String[] suits={"Spades","Diamond","Clubs","Hearts"}; private int[] number={1,2,3,4,5,6,7,8,9,10,11,12,13}; ArrayList<Cards> deck= new ArrayList<Cards>();
[code]....
I can understand why for example Deck class's suit and number arrays are set to private , as they only need to be accessed by this class only. however, both the Deck class's deck arraylist and the Player class arraylist are not private, as I need to transfer these values from one to the other and it felt to me that setting them to private would make it more difficult to deal with them, but what I did instead is to set the Game class dealCard(), which is the only method that have access to them as private. does this achieve the same effect or do I need to set both of these arrayList to private?a follow up question, this is more related to the actual card dealer program, in this code
private void dealCards(){
for(int x = 0 ; x < playerCount ; x++){ for(int y = 0 ; y < 10; y++){ playerList.get(x).pile.add(deck.deck.get(0)); deck.deck.remove(0); } } }
is there an API in ArrayList class that moves(adds to receiver and remove from giver) element across ArrayLists?
I deleted my default path value in system variables in the process of adding java location in that.. How can I get that default PATH value.. I am using windows 7 enterprise OS 32 bit in Dell laptop...
I would like to change the default skin of JavaFXapplication during runtime. How I can do this using ComboBox? Now I use this code to change the value:
setUserAgentStylesheet(STYLESHEET_MODENA);
Is there a way to change the skin in a run time?
Ref Set default skin in JavaFX with ComboBox - Stack Overflow
I have several Windows 7 Enterprise machines that have already been deployed via image and need to lower the security settings for use on internal web based applications.
Is there an easy way to manipulate the configuration (a file) so that I may simply make the changes by overwriting the current configuration settings instead of, having to go to each device, opening the Java console, and changing the security settings that way?
I have attempted to login as the machine administration, make the changes on the Java console with the hopes this configuration would have migrated to all user profiles that log into the PC. Is there a "public profile" configuration file I can change and if so, what should I do.
1 class which creates an instance of my GUI class class and initializes it which works fine.
1 class with all GUI stuff and another class which I'm trying to add all my actionsListeners to (which I can't seem to figure out).
Here is my GUI class: public class GUI extends JFrame{ Container container; CardLayout cl; public GUI(){ super("Game Finder");
[Code] .....
Using my new class "AllActionListeners" I want it to have the bulk of the actionListener code, in order to make the program more manageable. However, after looking around I don't seem to be any closer to a solution. How to move the action listeners to a different class?
