Display Data Structure With JTree In A Swing Application
Aug 28, 2014
I have a tree-based data structure that looks somewhat like this:image1.png..Every tree always has a height of no more then 3, and each of these classes has a very specific use, generalization is not possible between them.Now, I want to display my data structure with a JTree in a Swing application. A JTree needs a TreeModel and so I created a custom TreeModel for my classes, it looks like this:
public class CustomTreeModel implements TreeModel {
private Root root;
public Object getRoot() {
return root;
[code]....
But then I would introduce this interface to my Model classes just for the purpose of writing the View. So my data model has to be altered to make the View work, this sounds completely against MVC to me and also like something I dont really like.On the other hand, the CustomTreeModel would be much simpler, easier to understand, easier to maintain and just in general more pleasing to the eye.Should I change my Model to improve the View? Is instanceof okay to be used in View classes?
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Aug 27, 2014
I'm new to java and I'm currently trying to make a program that uses a JTree that implements a properties file. I have the Keys set to the nodes but I want it so that when the node is clicked it will retrieve the keys value from the prop file.
I did have some code for this initially but I as it did not work at the time and was causing issues to my project I got rid of it. I have my code for the jtree,the listener and the prop file.
Tree
Java Code:
JPanel panel_1 = new JPanel();
panel_1.setBackground(Color.WHITE);
panel_1.setSize(new Dimension(22, 0));
scrollPane.setViewportView(panel_1);
Properties properties = new Properties();
[Code] ....
Java Code: add = Adds files changes in your working directory to your index. Example: git add .
rm = Removes files from your index and your working directory so they will not be tracked.
Example: git rm filename mh_sh_highlight_all('java');
Is there a way of doing this? Been trying for a while now but to no prevail. The image is what it currently looks like
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Oct 6, 2014
I have written several simple data classes that I serialized manually by converting to text. At this point I need to serialize a more complex data structure. which will include lists of the simpler elements. Can serialize store and reconstitute this type of structure automatically or do I need to do this one manually as well? Consider the pseudocode below for a clarification of my question;
Java Code:
Class Hops{
String Name;
float Alpha Acid;
float Beta Acid;
};
Class Malt{
String Name;
float extract;
};
Class Recipie{
String Name;
CList HopList;
CList MaltList;
};
CList RecipieList; mh_sh_highlight_all('java');
I read the article on Serialization presented at tutorial point, but the example only showed a simple class, not lists of class members. What I want to do is serialize RecipieList, which consists of a CList of Recipies, which in turn consist of CLists of various ingredients.
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Nov 2, 2014
I would like to ask about JTree custom renderer. What could be wrong with this. Here's the deal:
I have a Jtree which suppose to view the structure of given folder, so far so good its working. But my problem is that i dont want it to show the full path as name, only folder name and file name. I wrote a custom JTree renderer in hope that this will solve my problem but it didn't.
Here is my custom Jtree renderer:
private static class MyTreeCellRenderer extends DefaultTreeCellRenderer {
@Override
public Component getTreeCellRendererComponent(JTree tree, Object value, boolean sel, boolean expanded, boolean leaf, int row, boolean hasFocus) {
super.getTreeCellRendererComponent(tree, value, sel, expanded, leaf, row, hasFocus);
if( value instanceof DefaultMutableTreeNode){
[Code] .....
and here is where I am trying to implement it:
tree.setCellRenderer( new MyTreeCellRenderer());
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Oct 28, 2014
I'm doing a project in which I must display prices of computer accessories in a Scroll Pane viewer. The if statements are all checkboxes. I am completely lost with how to print to the viewer if a checkbox is selected. Furthermore, I am also lost with how to add up all of the checkboxes.
private void USBCheckActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
double area = 0;
double computerprice = 500.0;
if (printerCheck.isSelected()){
double printer = 100.0;
[Code]...
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Oct 24, 2014
I have problem with manually (through my java code) selecting items in a JTree. I did Google the problem and found solutions here :
[URL]
This code worked for me only partially. Once I tried selecting deeper nested nodes, I ran into problems. Since my production code is very cluttered I built an example and reproduced my exact problem in it.
DummyView.java
package de.fortis.tcws.client.controller;
import java.awt.BorderLayout;
import java.awt.Dimension;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
[code].....
The important method is 'manualSelect(String[])'.
It streps through the tree by comparing user objects and finds the target node. Then it calls 'navigateToNode()' which uses the solution discussed in the links above.
This method behaves incosistently:
If you call it with an empty array it will correctly select the root node. The righthand pane shows the text of the selected node. = correct
If you call it with target node 1 it will correctly select node 1. The righthand pane shows the text of the selected node. = correct
If you call it with target node 1.1 it will select node 1.1 but for some reason it is not displayed as marked (no background). The righthand pane shows the text of the selected node. = only partly correct
If you call it with target node A it will run into an exception. Debugging reveals that the selection occurs correclty at first. You can also observe the righthand pane showing that 'A' was selected. But afterwards another TreeselectionEvent is occuring that has a NewLeadSelectionPath of null. I do not know where this second SelectionEvent is triggered from.
This code is run with Java 1.6.0_39 which is also what I will have to use in production.
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Oct 5, 2009
i need to display the data from an xml file in a DefaultTableModel using the addRow method. in my table there are three columns named "symbol", "info" and "value", so i must create arrays of string objects from nodelists and insert them in the model with something like - addRow(new Object[] { getSymbolData, getInfoData, getValueData } ); but im stuck and cant seem to get it right.
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Feb 26, 2015
I was trying to run an sql query to display onto my jtable. However, i got this as a result:
oracle.sql.CLOB@11876a2
When I run the same SQL query on Toad i get the field hugeclob and one is then able to see whats inside the field. I want to basically either have a hugeclob on my jtable or perhaps to display on a textarea the data
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Sep 28, 2014
I am trying to make a JTree. I have used this guide :[URL]
Now when I call my Class with
TreeMainMenu tree = new TreeMainMenu();
JScrollPane MainMenu = new JScrollPane(tree);
I get only the default JTree..
I need to understand how I should build my code to call the class as JTree.
This is my code:
public class TreeMainMenu extends JTree {
private DefaultMutableTreeNode top = new DefaultMutableTreeNode("TOP");
JTree tree;
public JTree TreeMainMenu() {
APNode();
tree = new JTree(top);
tree.getSelectionModel().setSelectionMode(TreeSelectionModel.SINGLE_TREE_SELECTION);
return tree;
[code]....
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May 27, 2014
I want to define this data structure , I show you an example
"first street",{{1,40},{43,45},{34,26}},
"second street",{{14,41},{42,5},{3,46}},
............
I wrote in this way but it doesnt work :
Map<String,ArrayList<int[]>> Street=new HashMap<String, ArrayList<int[2]>>();
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Feb 27, 2014
I'm trying to fill a List<String>, named overlappedGrid, from another List<String>, named listGrid. I'm facing an exception:Exception in thread "main" java.lang.RuntimeException: Uncompilable source code - unexpected type
required: variable
found: value
at arab2004_d.ProcessingLayer.printShape(Arab2004_D.j ava:101)
at arab2004_d.Arab2004_D.main(Arab2004_D.java:30)
Java Result: 1
Here is my source code (the exception line is commented "here is the exception"):
package arab2004_d;
import java.io.BufferedReader;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.util.LinkedList;
[code]....
I tried to copy listGrid in another List<String> but the exception remain the same.
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Jul 16, 2008
I am trying to drag and drop tree nodes within the same JTree. I have a code which uses Java 1.2 java.awt.dnd.I would like to use TransferHandler and newer implementation.I have found a code which works when JTree is drop target but there is no code where Jtree is drag source and drop target.
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Sep 27, 2014
Problem in inserting,removing and searching in trie data structure.
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May 4, 2015
I am trying to Implement a method matchBracket(String exp), which should take a String expression consisting of only symbols (,[,{,<,),],},> , and checks if the brackets in the expression are matching using stack data structure.
I know how the methods of stack class like push,pop,peek are for however how to do the checking for opening and closing brackets iteratively ?
public static void matchBracket(String str){
// creating a stack of character at first
Stack <Character> stack = new Stack<Character>() ;
// starting loop to scan the expression below inside main method
for(int i = 0; i<str.length(); i++){
[Code] ....
/**Expected Output:
*The parentheses are not matching
*The parentheses are matching
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May 21, 2014
My assignment is to design a simple GUI calculator using the stack data structure to perform additions, subtractions, multiplications and divisions. But i having error while i press the action there.
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.util.*;
import java.util.Stack;
public class JCalculator implements ActionListener {
[Code] ...
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Aug 27, 2014
When you select a node in a JTree can you then populate a JPanel based on more information about that node from a file?
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Feb 8, 2014
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.concurrent.locks.Condition;
import java.util.concurrent.locks.Lock;
public class tree_lock_test{
int total_instances;
int thread_instances = 0;
int N;
[Code] .....
this is compiled with another Peterson class which has implemeted peterson lock for two threads ...
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Jul 18, 2014
I've beginning a new assignment and would like some feedback on my outline for the program. You are to design a simple calculator using the stack data structure to perform additions, subtractions, multiplications and divisions. The user may enter an arithmetic expression in infix using numbers, parentheses and arithmetic operations (+, -, *, /). After an expression is entered, its postfix or prefix notation is displayed and then the result of the expression. You are required to design your own infix to postfix and infix to prefix conversions.
The professors example includes: SinglyLinkedList implementation, a Stack that implements Stack interface and extends SinglyLinkedList, a Node class, and StackApp -- in addition to the main class and the prefix/post-fix classes.
(The equation is entered/stored as a string variable)
System.out.println("Enter equation: ");
equation = input.next();
equation.trim();
(1.) Get the user input:
- evaluate the user input and use a stack to determine the correct prefix/post-fix notation.
- from the stack, pop each item:
a. account for '(' and ')' to push all operators and write all operands until ')', then pop/write
b. store new equation into a list (in prefix/postfix notation)
(2.) Display the list in both notations to the user.
(3.) Perform the calculation.Do you think it will be alright to calculate the original equation that was entered? It seems too much to then design a class that will then cycle through the polish notation and calculate according to that format.
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May 25, 2014
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class DisplayFinal_Panel extends JPanel {
private JLabel label1, label2, label3;
private JTextField box;
[code]....
I only want Listener 1 to work right now. Also, user input is in TextField.
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Jul 22, 2007
I'm going to be taking an object oriented paradigm using java during intersession in a few months. I'm trying to brush up on it a bit. The problem is. Write an application that displays the numbers 1 to 4 on the same line, with each pair of adjacent numbers separated by one space. Write the program using the following techniques:Use one system.out.printLn statement.Use four system.out.print statement.Use one system.out.printf statement.
This is what i have so far .
Java Code: public class Display
{
public static void main(String [] args) {
System.out.print("1 ");
System.out.print("2 ");
System.out.print("3 ");
System.out.print("4 ");
System.out.println(" ");<----is that what that is supposed to look like, and where it goes?
System.out.printf(" %s %s %s %s ");????
}
} mh_sh_highlight_all('java');
i cant test this my console isn't working right, and i haven't finished my compiler install.
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Feb 18, 2015
I have an application scoped and i want to edit it from request scoped data. I use this code but application scoped data are not updating. What i am doing wrong?
Application Scoped Data
@ManagedBean
@ApplicationScoped
public class ApplicationData {
protected String contactEmail;
public String getContactEmail() {
return contactEmail;
[Code] ....
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Mar 19, 2014
I would like to be able to change the locale in my Swing application at runtime and have all the text elements on the GUI update themselves with localized text from a ResourceBundle of the new locale.If there a simple way of achieving this without having to create an event model for all GUI pages?
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Apr 4, 2014
My goal is to display file that have extension *.java,I was wrote this swing in netbeans,
Java Code:
private static class FileSystemModel implements TreeModel {
private File root;
private Vector listeners = new Vector();
public FileSystemModel(File rootDirectory) {
root = rootDirectory;
[code]....
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Jun 25, 2014
ABC is a company that designs and prints personal business cards. The company has asked you to write a Java application to display the layout of the information in a typical business card order. Data items in a typical business card include the customer's name, address, city, state, postcode, home phone number, and work phone number.
Write, compile, and test a Java class that displays these data items in a command window. Alternatively, you could also create it using a dialog box. Please include appropriate comments in your class.
Please named your class BusinessCard(LIM).java. (eq. BusinessCardLIM.java)
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Aug 4, 2014
What would be the most effective method to display data grabbed from a web source that is queried every second, for example the most recent EUR/USD price?
I already have access to the data stream, and I've built a simple FXML in javaFX that contains a grid; I'm not sure how to approach putting the live ticking data into the grid so it continues to update as the price changes, for example.
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Feb 7, 2014
I am relatively new to JSF. I am trying to display data into a web page sorta like a jTextArea or at least onto a panel that is on the webpage, something similar to that. I can display the data in a particular format but it won't appear onto a panel in a specific location or the panel being a particular size.
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