Accessing Keylistener From Thread

Mar 23, 2014

I start my thread, it's for a real basic game I'm learning. Everything was working fine, until I got to recognizing keys. It runs, and I can close using the mouse on the close command, but the keys aren't being generated from the keyboard. I copied it to a working sample, and here are the two files.

package testkeys;
import java.awt.Canvas;
import java.awt.Dimension;
import java.awt.image.BufferedImage;
import java.awt.image.DataBufferInt;
import javax.swing.JFrame;

[Code] ....

The idea was to set the return value to true if any key is pressed, thus quitting, for this short sample program. Problem, it never recognizes any keys pressed on the keyboard. New to java and threading.

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Add KeyListener To Thread

Feb 13, 2014

I want to try and run a thread that starts running on start and quits after pressing a key.I cant seem to detect keypresses. ci cant seem to add code: Post denied. New posts are limited by number of URLs it may contain and checked if it doesn't contain forbidden words.

its just a code snippit without links or anything..this is a small part... but how do i add a keyListener in here that listends to a random key?The class implements KeyListener and the overrided method "keyPressed" sets the isRunning boolean to false... but the keyPressed method is never executed.

public static void main(String[] args) {
Thread thread = new Thread() {
public void run() {
while(isRunning){
System.out.println("running");
try {
sleep(1000);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
};
thread.start();
}

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class A extends Thread
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String str;

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//random stuff
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Sep 20, 2014

I'm currently learning about Swing but I can't get my head round this piece of the code. Here is a simplified gui (not interested in the gui part but the execution)

public class SwingDemo implements ActionListener {
SwingDemo(){
JFrame jfrm = new JFrame("Simple gui pro");
//rest of code
public static void main(String[] args) {
new SwingDemo();
}

I get the above, create a new instance of SwingDemo in the main thread which starts up the gui through the constructor. However, then the tutorial says that I should avoid doing the above but do this instead:

public class SwingDemo implements ActionListener {
SwingDemo(){
JFrame jfrm = new JFrame("Simple gui pro");
//rest of code
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() { //why do this instead?
public void run(){
new SwingDemo();
}
});
}
}

Reading, it talks about an event-dispatching thread which has completely lost me... Why not just instantiate the object directly instead of creating another thread?

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Oct 17, 2014

im having an issue with the 3rd thread that are supposed to merge the two sorted sub arrays , i pass the 2 subarrays to my runnable function sortlist and they are renamed IntSortList 1 and 2 and th1.start() and th1.join() are called and it works fine, but then i have another runnable constructor that takes IntSortList 1 and 2 but it does take a runnable. below is the code in my main,

Runnable InSortlist1 = new sortList(data2p1);
Runnable InSortlist1 = new sortList(data2p1);
Thread th1 = new Thread (IntSortlist1);
Thread th2 = new Thread (IntSortlist2);
try
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th1.start();
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[code]....

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Oct 8, 2014

How to access one thread from another thread?

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Oct 30, 2014

I'm trying to add a KeyListener, but every time i do i have to implement methods that i will not use.

import javax.swing.*;
import java.awt.*;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
public class GameFrame extends JFrame implements KeyListener{
private GamePanel panel;
*/
public GameFrame()

[code]....

it works just concerned about the unimplemented methods.I'm supposed to make a row of images all the way across the screeen and down it unless the row contains the player. which is always at the bottom.

private void drawRow(int y, int blockWidth, int blockHeight, GameRow row, Graphics g) {
Image img = Toolkit.getDefaultToolkit().getImage("blocks.png");
for(int i = rows.size()-1; i >= 0; i--) {
if(rows.get(i).isEmpty()) {
g.drawImage(img, width,y,blockWidth, blockHeight, null);
}
}
}

As of right now it will only paste on the FIRST column not the rows.

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May 31, 2014

I'm programming a game, but the keyListener doesn't work. Here is the source code:

import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
 public class InputHandler implements KeyListener{
 public InputHandler(Game game) {
game.addKeyListener(this);

[code]....

My Question is: Why will it not say "up", if I press "w"?

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Jun 16, 2014

I am trying to program a version of the "Worlds Hardest Game" using ready to program and applets for a final class project. Unfortunately I cannot figure out how to get my keylistener to work because I am using a loop for the enemies to go back and forth.

import java.applet.*;
import java.awt.*;
import java.awt.event.*;
 public class HardestGame extends Applet
implements KeyListener, MouseListener {
final int WIDTH = 400;
final int HEIGHT = 123;
int myX = 400;
int myY = 400;

[code]...

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Jan 13, 2014

I wrote this program that makes a little square move around with the wasd keys. A huge problem that I had while creating it is adding the keylistener to my JFrame. In the end, I ended up creating an anonymous KeyListener class and adding that anonymous class to the JFrame. However, this anonymous class requires two other methods that I don't use, so any other thing I could have done to add these keylisteners to the JFrame without creating an anonymous class? I had to create 4...

Java Code:

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Component;
import java.awt.Graphics;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;

[Code] .....

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Feb 1, 2014

I am trying to make a program where a ball moves up continuously when you press space, then begins to move down when you reach a certain point. My method for this is to have a timer, and have a method that does this: When you press space, add 10 y coords every second (using a timer), and if you reach 470 y, then begin to drop 10 y coords. I made a method to hold the keylistener, and am running that method inside the actionPerformed method which is within another class. However, since it is a method, I cannot add my keylistener to my frame in the main method.

main
error line 9
Java Code: import javax.swing.*;
public class Main {

[code]...

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Jun 9, 2014

I have a JMenuItem "Find" in the Edit Menu. I want to add a shortcut key to the JMenuItem.

For Find for example i want to use Ctrl + F

Here is my 'Action' for 'Find' which can be used via Edit->Find. It works.

Find = new AbstractAction(){
public void actionPerformed(ActionEvent e){ 
String word = JOptionPane.showInputDialog(new MainWindow(),"","Find",PLAIN_MESSAGE);
new WordSearcher(textArea,word);
}
};

WordSearcher() is a class i am using to search the word

Now i want to add a KeyListener for ctrl+F, for doing the same purpose. Even this one works.

private KeyListener k1 = new KeyAdapter()
{
public void keyPressed(KeyEvent e)
{
if(e.isControlDown())

if(e.getKeyCode()== KeyEvent.VK_F)

[Code] ....

But the problem here is i have to write the same code twice. Is there some way by which I can Use the already written Action Find in the KeyListener.

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I Want to identify up, down, left and right keys with the keylistener() WHATE NAME DO I IDENTIFY IT WITH

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i can use this current code to change it so that it use TextArea in jsp and the keylistener code in servlet. i know i have to take out the JFrame,JTextfield and ContentPane but still i could not do it.

Servlet:

import java.awt.BorderLayout;
import java.awt.Container;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import java.io.IOException;

[code]....

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import java.awt.Container;
import javax.swing.*;
public class Main extends JFrame{
private GamePanel panel;
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panel = new GamePanel();

[code]....

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I'm trying to create a simple snake game, but I can't get my timer and keyListener to work...

//Timer
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[Code] .....

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make the keylistener "listen" across the entire application? Currently whenever I've used it I have always attached it to something else, like a JTextField or the like. However that doesn't work all that well if I for example want to close down the current JDialog by pressing escape, because no object that has the keylistener attached to it is currently focused.

When I searched around for the answer if found similar questions on stackoverflow, but those seemed to focus on listening globally, even when the application itself is not focused, which isn't quite what I want.

Here is a simple piece of code that I'm currently experimenting with:

import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import java.io.IOException;
import java.security.spec.InvalidKeySpecException;

[Code].....

It's supposed to simply create a frame and give me a message whenever I press the A or D buttons, as well as notify me whenever they are released. As of currently it obviously doesn't work because the keylistener hasn't been attached to anything, but that's also where I'm unsure of how to proceed.

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I am trying to create the Breakout game and cannot figure how to get the paddle to move and make constraints to bricks disappear when the ball hits them but not the paddle. I tried this:

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obj = paddle;
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but I get an error for the "paddle.move();". Below is the entire code that I have gotten so far:

import acm.program.GraphicsProgram;
import acm.graphics.*;
import java.awt.Color;
import java.awt.event.*;
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[code]...

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Here is my code:

package main;
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import java.awt.Container;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
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[Code] .....

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import java.awt.Color;
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import java.awt.Graphics2D;
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[Code] ....

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[code]....

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[Code] ....

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[Code]....

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Game continues...
Dealer places King and Queen on the table.

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import java.util.*;
import java.io.*;
import java.lang.*;

public class P5
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[code]....

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