MouseListener - How To Increase A Value By Clicking It
Dec 25, 2014
I want to make a simple game and learn java by experimenting with it.I don't know how to increase a value by clicking it.I know how to make my objects move in my small game with mouse or keys, but I also got a score var that I want to increase per click. I can increase it over time, but after 2 hours of trying I couldn't progress any further.This is the piece of code I used, I imported the class, got getters n setters and all of that...
if(e.getButton() == MouseEvent.BUTTON3) hud.setScore(hud.getScore() + 555);
Whenever I click I get an error, if I remember right "NullPointerException" is when something is missing I'm probably not targeting the value correctly...
Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
at com.tutorial.main.MouseListens.mouseClicked(MouseListens.java:22)
at java.awt.Component.processMouseEvent(Unknown Source)
[code]...
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Mar 8, 2014
is any simple way to apply the same code on both ActionListener and MouseListener, so that the same code is executed when the user either presses a JButton or presses Enter when a JTextField is focused.I know that I can define a method, while it is not preferred as I may use break; in my MouseListener.
A simple example:
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class TwoListener extends JFrame
{
[code]....
Although I can define a new method that prints out the three numbers, I have to add certain break; code in different cases. So I just wonder whether there is another way to do things like this.
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Aug 13, 2014
I know that JMenu and JMenuItem is suppose to use action listeners but would you consider this implementation an exception?
menuAbout.addMouseListener (new MouseListener () {
@Override
public void mouseClicked (MouseEvent arg0) {
JOptionPane.showMessageDialog (null, "Server Tec Software System
}
@Override
public void mouseEntered (MouseEvent arg0) { }
@Override
public void mouseExited (MouseEvent arg0) { }
@Override
public void mousePressed (MouseEvent arg0) { }
@Override
public void mouseReleased (MouseEvent arg0) { }
});
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Mar 2, 2014
I'm trying to build a program which sets a fill color for a rectangle. Each time the mouse is clicked the fill color changes according to the position of the mouse's X and Y. I succeeded to create a JFrame with a changing background according to the Mouse's position, but I can't seem to change the color of the rectangle (defined in MyPanel class).
This is the current code,
import java.awt.*;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.SwingUtilities;
import javax.swing.JFrame;
[Code]...
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Sep 5, 2014
My program has a MainFrame(extends JFrame)class and BasePanel(extends JPanel) class,and many other panels.I had used Images with JLabel in BasePanel.My current panel in MainFrame is BasePanel.I had used MouseListener so that when I click on any of the label it should show Other panel in same MainFrame and hide the BasePanel.But I am getting some problem with that.When I click on the Label,It hides the BasePanel but do not show the new Panel(Dictionary Panel in my code). In short when label is clicked I want to make DictionaryPanel visible and BasePanel invisible,both in MainFrame. I am using the following code on Label:
//constructor of BasePanel class
public BasePanel() {
dict=new Dictionary();
mf=new MainFrame();
dictLabel.addMouseListener(new MouseListener() {
public void mouseReleased(MouseEvent arg0) {
[Code] ....
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Nov 9, 2014
I have a JList<Object> in my code (it actually takes JLabels) called imageList, and I've given it a custom CellRenderer using the following code:
cellRenderer = new DefaultListCellRenderer() {
private static final long serialVersionUID = 1L;
@Override
public Component getListCellRendererComponent(JList<?> list,
Object value, int index, boolean isSelected,
boolean cellHasFocus) {
[Code] .....
However, when I click anywhere on the JList, nothing gets printed to the console, which suggests that the mousePressed() method isn't being invoked. I think it's a problem with the CellRenderer, because I have similar code elsewhere that works, the only difference being I don't use a custom CellRenderer.
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Feb 8, 2015
import java.util.Scanner;
public class SalesTax {
public static void main(String [] args) {
Scanner input = new Scanner(System.in);
double total = 0;
double currentTax = 0;
[Code] .....
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May 15, 2015
I was wondering what the easiest way would be to keep track of everytime someone makes a new post on reddit (social media site, for those who don't know). I want the program to keep track of the number of posts made with a counter, but that's the easy part. How do I set up a program to actually communicate with and monitor reddit's servers in this manner?
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Oct 7, 2014
Basically I need to increase the hours of an employee at the given index. Index is the position of the employee in the array, and amount is how many hours you will be increasing by.
This is what I have so far,
public void increaseHours(int index, double amount){
for(Employee e: employees){
if(e instanceof HourlyEmployee){
HourlyEmployee he = (HourlyEmployee)e
he.increaseHours(amount);
}
}
}
}
I'm not sure how to use the index to do this correctly, all it's doing right now is adding hours to every hourly employee
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Oct 7, 2014
Basically I need to increase the hours of an employee at the given index.Index is the position of the employee in the array, and amount is how many hours you will be increasing by.
This is what I have so far,
public void increaseHours(int index, double amount){
for(Employee e: employees){
if(e instanceof HourlyEmployee){
HourlyEmployee he = (HourlyEmployee)e
he.increaseHours(amount);
}
}
}
}
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May 19, 2015
While loading very huge xml file i m getting heap space error in myeclipse. So I wanted how to increase memory so that xml file will get loaded?
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Sep 29, 2014
When I try to write the .xlsx file using apache POI, XSSFWorkbook API and run this program in Eclipse STS, I am getting the java.lang.OutOfMemoryError: Java heap space error. Then I searched the net and add these -Xms512m -Xmx1024m in the eclipse VM arguments. Even though I am getting the same error. Again i increase heap size but i am getting the different error like "occurred during initialization of VM, Could not reserve enough space for object heap". how to increase the heap size or any other API to read, delete and write the .xlsx file. I am having 4GB ram in my machine. Apache POI is very good for .xls but if it is .xlsx performance wise it is very slow.
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Dec 3, 2014
I'm working on a program to create a blackjack game using objects (one for card, deck. and hand). Withing my hand object I am trying to add cards to the hand but it is only adding the last card i try to add and giving null values for the the ones before.
class BlackJackHand {
private BlackJackCard [] hand;
public void addToHand(BlackJackCard c) {
if (hand == null) {
BlackJackCard [] tempHand = new BlackJackCard[1];
tempHand[0] = c;
hand = tempHand;
[Code] ....
What I want this section to do is add cards to the current hand. I was intending for it the hand to be null at first and the if(hand == null) piece to add the card the first time and then the else piece would be used when the hand already has at leas one card. I want the else section to create a temporary array that is one larger than my current hand, copy the cards from the old hand to the new hand, and then add a new card to the last space before rewriting the old hand as what the temporary hand is.
The code I am using to test if the addToHand() is working is
class BlackJackTest
{
public static void main (String[]args) {
BlackJackCard c1= new BlackJackCard(1,0);
BlackJackCard c2= new BlackJackCard(1,4);
BlackJackCard c3= new BlackJackCard(1,5);
BlackJackHand h1 = new BlackJackHand();
[Code] .....
BlackJackCard has the parameters (int suit, int value)
This should print:
ace of clubs
4 of clubs
5 of clubs
but instead prints:
null
null
5 of clubs
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May 6, 2014
I have been playing around all day trying to get this to increase the value of number by one after each new runner is added. How to get the value of number to increase after each record is added?
public class Runner
{
/* static variables */
/* instance variables */
private int number; // runner's number
private String name; // runner's name
private String ageGroup; // standard, junior or senior
private int time; // runner's marathon time in minutes
[Code]...
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Apr 11, 2013
I was making a pong game, part copied code off the internet, part my own code, part my friends code. It works well enough, but the ball starts at one speed, and stays the same. I would like to know how to make the ball slowly increase.
It is a java applet, which shouldn't casue any harm right?
My code:
Pong Applet
import java.applet.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class Pong extends Applet implements MouseMotionListener, KeyListener {
[Code] .....
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Jul 7, 2014
I was wondering where is the memory allocated for an applet; by the browser; by the JVM; some applet specific java option? I get an out of memory error when running my applet (loading pictures).
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May 5, 2014
Whenever i perform any operation in my application Live Bytes of a particular Instance of a class increases by 1000.Although i perform the same operation everytime it always increases by 100 or 1000.Is this a memory leak or does these instances increase everytime we perform an operation.
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Jan 31, 2015
I'm trying to create a circular array which prints out 8 numbers that increase by one and don't exceed 9. If they do, the remaining numbers are printed from 0 on-wards. I have code below which does this job, but it doesn't really use an array to loop back.
Java Code:
package Practice;
public class Practice
{
public static void main(String[] test)
{
number(7);
number(9);
[code]...
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Feb 3, 2014
I am writing a script for a program, now I am very new to Java. So, issue I am having is the program keeps clicking on the MM continuously. I just want it to click each spot 1 time.
Here is my code :
public class ToPortal implements Strategy {
Tile Portal = new Tile(2681, 2591);
Tile To = new Tile(2667, 2601);
[Code] ....
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Nov 10, 2009
I've been programming for a while, but I never made executables... just ran it from the compiler. Now, however, I really want to have an icon for one of my programs that would be conveniently located and clickable. So, I made a jar file, both in Eclipse and BlueJ. When I run this file in command line, it works fine (with "java -jar ..."). In case of Eclipse, this worked with both "jar" and "Executable jar" options. However, when I double click the icon, nothing happens. First I was getting "can't find main class" error, but that was an easy fix with the manifest file. But now, nothing seems to happen at all. Could this be because the program is supposed to run in the command line or whatever the compiler offers and there is nothing to force the computer to open one of those windows?
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Dec 1, 2014
as there is a button on the website, that I need to click, but it returns a number using javascript that will access the page. Without that number, accessing the page won't work. Therefore, either I need to click the button, or return that data when I access the url. Here is the line in the html.
<a href="/missions.php?jid=11&cat=2&formNonce=49af09362db790 a6b364401c4ea52a08b515df4a&h=284e4fe4946e6fb8af3a6 62f4583454eebc8bd23" class="actionButton" onclick="return fsb11('5494');">Do It</a>
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Jan 22, 2014
ItemListener: checkbox component
I want to display a picture by clicking on the checkbox.
Here is my code:
public class Dukes {
String action;
String friend;
public String getActionImage() {
return action;
[Code] .....
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Feb 25, 2015
Here's my coding so far...I want to be able to change what the JLabel says when clicking on one of the buttons for example : when clicking on UP i want it to say "Going Up!"...how do i do this?
import java.awt.BorderLayout;
import javax.swing.JFrame;
import javax.swing.JButton;
import javax.swing.JLabel;
public class BorderLayoutJFrame extends JFrame {
[Code] .......
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Dec 28, 2014
I am writing code for a form in which i want to display data by selecting radiobutton.The code is working for single radiobutton but it not work when i select the other radiobutton.
Capture.PNG1.jpg
the code is given below:]
private void jRadioButton1ActionPerformed(java.awt.event.Action Event evt) {
// TODO add your handling code here:
int LIMIT = Integer.parseInt(jTextField2.getText());
int ULIMIT = Integer.parseInt(jTextField3.getText());
{
DefaultTableModel model = (DefaultTableModel)
jTable1.getModel();
[code]....
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Oct 14, 2014
I have added a windowListener to my JFrame but for some reason it is not being called when I click X to close the window. I need to send a message to a server to notify it that the client window is closed. Some code snippets below (some lines excluded for brevity):
public class ChatGUI extends javax.swing.JFrame {
....
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE); // I have all the window constants here but has no effect other than closing the window without calling the listener...
addWindowListener(new java.awt.event.WindowAdapter() {
public void windowClosed(java.awt.event.WindowEvent evt) {
formWindowClosed(evt);
}
});
....
private void formWindowClosed(java.awt.event.WindowEvent evt) {
[code]....
This is resolved, needed to use...
addWindowListener(new java.awt.event.WindowAdapter() {
public void windowClosing(java.awt.event.WindowEvent evt) {
formWindowClosing(evt);
}
});
... instead.
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Nov 18, 2014
Is there a way to disable sorting by clicking on the JTable headers?I have tried a few ways but because I am sorting the data when I load it that 'breaks' that also. Here is what I am trying to achieve.
Sort by 3 columns:
table.setAutoCreateRowSorter(true);
table.getRowSorter().toggleSortOrder(6);
table.getRowSorter().toggleSortOrder(7);
table.getRowSorter().toggleSortOrder(5);
table.getRowSorter().toggleSortOrder(5);
but then I want it so the user cannot resort that when the table is displayed..
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