Started ok i guess? But when it comes to the save and get methods im totaly lost.. (See the code)
import java.util.HashMap;
public class Model {
HashMap<Integer,Long> m = new HashMap<Integer,Long>();
Integer value;
Long result = 2 * computePower(value-1);
public long computePower(int value){
if(value <= 0 )
[Code] .....
I am trying to build a servlet that does simple addition and subtraction then re displays the result on the same screen. I started the building the servlet I am just not sure I understand how to assign the value from a text area to a variable, so that I can complete the logic its still early stages, but its a simple app so it wont be a very long project(I hope lol). My question is how to assign the value that the user inputs to the text area to a variable that I can use?
My code and compile time errors:
C:UsersReignDesktopHTMLBank.java:89: cannot find symbol
symbol : variable Amount
location: class HTMLBank
if(Amount.equals("")||Amount.equals(null))//||Amount.equals(<0))
[Code].....
Have an issue with deploying our application, which comes in two parts, with javaws . In our installer (which is coded in NSIS) we call javaws twice, each time referencing a different jnlp file. It looks like this:
javaws -wait -shortcut -import -system http://192.168.1.82/launch?[params]
javaws -wait -shortcut -import -system http://192.168.1.82/launch?[slightly different params]
Whichever jnlp file is second gets imported into System Applications. My guess is that it is overwriting the first imported application.
I can often write a recursive backtracking solution, but don't know how to cache the answers into an appropriate array.
For example:
Java Code:
public static int max(int[] costs, int index, int total, int shares) {
if(index >= costs.length) {
return total;
}
int buy = max(costs, index + 1, total - costs[index], shares + 1); // buy one stock
int sell = max(costs, index + 1, total + shares * costs[index], 0); // sell all stocks
return Math.max(total, Math.max(buy, sell)); // compares between buy, sell, and doing nothing
} mh_sh_highlight_all('java');
This is a dynamic programming exercise, but I have no idea what dimensions the dp array should be (I was thinking maybe dp[index][total][shares], but that seemed like overkill). Is this just because my understanding of recursion isn't solid enough or am I missing something else?
I am generating java script tag and javascript code in servlet and displaying it in each jsp page. i include this in every jsp in my application. I am preparing the following javascript content and diplayin each jsp
<script type="text/javascript"> BOOM.addVar (clientId = SOME universal unique ID ) </script>
the clientid will be uniqueid it gets generated every time.
Here my question is, is there any possibility the clientId will be store in browser cache or third party cache server. if yes how to prevent clientId from cache.
I don't want to prevent the whole jsp file from cache. i just want to prevent only that particular field. so that i can use advantages cache and also prevent particular header field to be cached.
Also can we prevent particular http header attribute from cache.
Our company has a web based project which using the Jboss EAP 6.1 +EJB 3.1 + JSF2 and deployed it in a cluster environment(Server A,Server B and Server C).We have created some schedule tasks by using EJB timer service and the timer data file is stored in a central file system.And users can login and access to a task configuration page to customise his own tasks by create,update,delete actions etc.But we find that the timers don't work correctly in the cluster environment.
For example.When we start the Servers(A,B,C),each server will load the timer file data into his own node cache from the central file system.But when one user go to the task configuration page to update or delete his own tasks from one of the Servers, it only update the change on its own node cache and don't replicate the timer data to other nodes' cache and which cause the problem.
I know there is one way to fix it is that we could shutdown the three Servers and re-boot them and the timer data file will be re-loaded into each server's cache. But we can't do that because the users want their own created/updated tasks take effect immediately once they change them.My question is that when the timer data in cache is updated on one server, how to make it synchronize to the other Servers'.
How can I Cache the data I'm reading from a collection of text files in a directory using a TreeMap? Currently my program reads the data from several text files in a directory and the saves that information in a text file called output.txt. I would like to cache this data in order to use it later. How can I do this using the TreeMap Class? These are the keys,values: TreeMap The data I'd like to Cache is (date from the file, time of the file, current time).
import java.io.*;
public class CacheData {
public static void main(String[] args) throws IOException {
String target_dir = "C:Files";
String output = "C:Filesoutput.txt";
File dir = new File(target_dir);
File[] files = dir.listFiles();
[Code] ....
how to build a GUI. I typed (not copy and paste) this code line by line to understand and get a meaning to each command. I ran into some errors while compiling and decided I would try to fix it. I ran into a problem there.....
import javax.swing.*;
import javax.swing.event.*;
import java.awt.*;
import java.awt.event.*;
[Code].....
He said that if you need something that Swing can't provide, like a bar graph, you build it. Now, being used to just writing a method that will open up a JFrame, how you would actually build graphics on your own. How in the world would that work? How would one write their own methods to make a window or to build a graph?
View Replies View Relatedhow to build GUI's with JFrame and I was firstly very confused as to when and what is always needed for any GUI in Java. How do I know everything I need for a GUI? Are there certain things every GUI will need by default?
Additionally below I have a code snippet of when this person used the "this" as an argument to a JButton and Im just really confused for when I can use it and when I can't.
public UIStuff(){
super("Multiple Button Events");
init();
} // end multi-button
[code]....
i am having problems with making it start. i have the buttons set but when i click on them they don't do anything.
mport java.awt.*;
import javax.swing.*;
public class Fan extends JFrame {
[Code].....
I need to build the triangle like below. How to solve this using loops.
*
* *
* * *
* * * *
* * * * *
i have a problem, i need build a calender in BlueJ. The program need to found if I put this one year have to give me the full schedule but only the first semester.
View Replies View RelatedI wanted to build a calculator in java but I have a problem I wanted to when I type "plus" , go to This IF but don't go
import java.util.Scanner;
public class Session {
static String amal;
[code]....
I am trying to build an address book, and I started from what i know how to do.
public class Persona {
String nome;
String indirizzo;
int cellulare;
public Persona(String nom, String ind, int cel) {
nome = nom;
indirizzo = ind;
cellulare = cel;
[code].....
Now I would like the program to take a string I insert on command line (for example java Cerca"Robert Baratheon") and compare it to the nome field of every Persona in the address book.
I need a summary of the steps involve in building java application.I have my source code, already compiled but I don't know the next step to make it run on a particular device. I know of emulator but I need more information.
View Replies View RelatedI am trying to run my program through netbeans and I get a message:
...build-impl.xml:1048 the module has not been deployed.
see the server log for details.
The corresponding line in the xml document is:
<nbdeploy clientUrlPart="${client.urlPart}" debugmode="false" forceRedeploy="${forceRedeploy}"/>
And in the server log there is a long list of comments, the first which looks to be of significance to this issue is:
WARNING [http-apr-8080-exec-57] org.apache.catalina.deploy.NamingResourcesImpl.cle anUp Failed to retrieve JNDI naming context for container [StandardEngine[Catalina].StandardHost[localhost].StandardContext[/transBoard]] so no cleanup was performed for that container
javax.naming.NameNotFoundException: Name [comp/env] is not bound in this Context. Unable to find [comp].
There are others further down the list which might also be significant such as:
SEVERE [http-apr-8080-exec-59] org.apache.catalina.core.ContainerBase.addChildInt ernal ContainerBase.addChild: start:
org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost].StandardContext[/transBoard]]
The corresponding line of code for the first warning that I listed is for the DataSource object and I wrote it as follows:
dataSource = (DataSource)
ic.lookup("java:/comp/env/jdbc/trans_board");
I'm pretty sure the issue has something to do with connecting to the database since it ran fine before I added the database related code.
I never used tree, node etc. Consider an array of strings that come from html tags. This needs to be turned into a tree structure. Here, any Hn is the child of the most recent Hn-1
String[] Headers = {"H1", "H1", "H2", "H3", "H3", "H2", "H2", "H3",
"H4", "H2", "H2", "H2", "H1", "H2", "H2", "H3", "H4", "H4", "H2" };
Desired output -
ROOT
H1
H1
...H2
......H3
......H3
...H2
...H2
......H3
.........H4
...H2
...H2
...H2
H1
...H2
...H2
......H3
.........H4
.........H4
...H2
ANSWER -
class Example {
static class Node {
final String name;
final int indent;
Collection<Node> children = new LinkedList<> ();
[Code] .....
For my first attempt at writing a program that consists of more than one class, I am trying to build a Clash of Clans troop calculator. It will allow the user to configure an army composition and return the cost to train, the total damage per second, and the total training time. Cost and damage will vary based on the levels of each type of troop. Total troop capacity will depend on the number and level of the available army camps. URL...
Eventually it will need a GUI, but I'm just trying to plan out the components right now. I started by writing a masterclass called Troop, and subclasses for each type of troop.Troop class:
public class Troop {
private int qty;
private int level;
private static int HOUSING_SPACE;
private static int TRAINING_TIME;
private int elixirCost = 0;
private int darkElixirCost = 0;
private int damagePerSecond = 0;
private int hitPoints = 0;
[code]....
I made each type of troop its own class because 1) the setElixirCost(), setDamagePerSecond(), and setHitPoints() methods will all use different values for each different troop type and 2) I thought building an Army of one of each object would be the easiest way.
Now I'm trying to figure out the best way to build the Army class. It will basically just be a collection of Troop objects, with a few methods to return the total training time, total elixir cost, total hitpoints, and total damage per second. Should it be its own class? I thought about making it just an array of Troops, but it needs to have its own field for max housing space so the client can warn the user to stop adding troops when all army camps are full.
I have recently taken up some java after a period of time learning batch scripting. the issue I have run into is that my build compiled and ran just
fine when invoking from within the netbeans IDE but after that I 'cleaned and built' the jar and the IDE stored it in the directory that I specified while installing.
I went to that folder, double clicked on my gui and go nothing. So then I opened a command prompt did, "java -jar myapp.jar" and got the following of which has me completely lost:
Exception in thread "AWT-EventQueue-0" javax.persistence.PersistenceException: No Persistence provider for EntityManager named
at javax.persistence.Persistence.createEntityManagerF actory(Persistence.java:85)
at javax.persistence.Persistence.createEntityManagerF actory(Persistence.java:54)
at my.numberaddition.NumberAdditionUI.initComponents( NumberAdditionUI.java:31)
at my.numberaddition.NumberAdditionUI.<init>(NumberAd ditionUI.java:18)
[Code] ....
I am trying to run my program through netbeans and I get a message: build-impl.xml:1048 the module has not been deployed. see the server log for details.The corresponding line in the xml document is:
<nbdeploy clientUrlPart="${client.urlPart}" debugmode="false" forceRedeploy="${forceRedeploy}"/>
And in the server log there is a long list of comments, the first which looks to be of significance to this issue is:
WARNING [http-apr-8080-exec-57] org.apache.catalina.deploy.NamingResourcesImpl.cleanUp Failed to retrieve JNDI naming context for container [StandardEngine[Catalina].StandardHost[localhost].StandardContext[/transBoard]] so no cleanup was performed for that container
javax.naming.NameNotFoundException: Name [comp/env] is not bound in this Context. Unable to find [comp].
There are others further down the list which might also be significant such as:
SEVERE [http-apr-8080-exec-59] org.apache.catalina.core.ContainerBase.addChildInternal ContainerBase.addChild: start:
org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost].StandardContext[/transBoard]]
The corresponding line of code for the first warning that I listed is for the DataSource object and I wrote it as follows:
dataSource = (DataSource)
ic.lookup("java:/comp/env/jdbc/trans_board");
the issue has something to do with connecting to the database since it ran fine before I added the database related code.
update: my server.xml file is as follows:
<?xml version='1.0' encoding='utf-8'?>
<!--
Licensed to the Apache Software Foundation (ASF) under one or more contributor license agreements. See the NOTICE file distributed with this work for additional information regarding copyright ownership.The ASF licenses this file to You under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at
[code]....
I want build to build a website buider in java that contains drag & drop functionality for editing templates of websitesI need to build a replica of the site URL....I want to know what framework would i use for building this in java whether it shuold be swings,awt or some other i need to integerate in java like flex or something.how to get started with this.
View Replies View RelatedI 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]....
I've chosen to build a GUI that will initially display a window with 'x' number of buttons for different subject areas of physics (kinematics, waves, sound, circuits...etc). I would like to use an Actionlistener for each button so that when its pressed, the JFrame will extend a sidepanel or expand the JFrame with a new JPanel that contains variable Jtextfields so the user can enter data to calculate.
I'd like to know if its possible to do this with the JFrame or should I just open a new window altogether? I have some other features I plan to add to the program, but this is where I am right now.
how difficult is it to add a banner image and imageIcon? By banner image I mean create a Jpanel that will contain a header for the window and will have some cool physics jpg image.
Difference between using windows builder in eclipse v/s using only java swing without windows builder to build GUI application?
View Replies View RelatedIn order to create an xhtml view:
1. All jsf tags like datatable, form, etc.. will generate UIComponents in server side, right?
2. All non JSF tags will not generate UIComponents in server side, right?
3. If you want something in a view that will be the same across users and requests, I mean, It will not change like a label tag, it doesn't make any sense to create it with a JSF tag in order to save memory in server side, right?