How To Add A KeyListener

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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KeyListener Is Not Working?

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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Keylistener In A Loop?

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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Another Way To Add Keylistener To JComponent?

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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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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How To Access Keylistener If It Is Within A Method

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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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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Combining JMenuItem And KeyListener

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);
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}
};

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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Apr 9, 2014

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

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May 22, 2014

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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Java Game KeyListener Not Working In FSEM

Sep 5, 2014

I had a game written in a 500x400 window using JFrame and a threaded JPanel. It used KeyListener to detect user input and worked just fine, problem was it was very click dependent and therefore I wanted to put it into fullscreen mode so I would no longer come across the problem of clicking outside the window and being taken out of the game. But when I ported the game to Full Screen Exclusive Mode the KeyListener no longer seems to be working and I have no clue why. I tried using KeyBindings as well, that code didn't work and is left commented out in the FSEM code.Here is my code for the windowed application:

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

[code]....

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May 25, 2014

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

//Timer
Timer tm = new Timer(5, this);
int x = 50, y = 250, vel = 2;
// The snake
g.setColor(Color.black);
g.fillRect(x, y, snakeSize, snakeSize);

[Code] .....

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Creating A Keylistener That Reacts Across The Entire Application?

Aug 13, 2014

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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May 14, 2012

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:

public void keyPressed(KeyEvent press)
{
obj = paddle;
int key = press.getKeyCode();
if(key == KeyEvent.VK_LEFT)
{
while(true)
{
paddle.move();
}
}
}

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.*;
import acm.util.RandomGenerator;

[code]...

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KeyListener Doesn't Work - Button Is Not Displayed

Apr 14, 2015

Why the keyTyped function isn't triggered, when i type a key?

Here is my code:

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

I have noticed, that if i call setVisible(true) before i add the button, then it works, but the button is not displayed... How can i achieve that the button is displays AND the KeyListener works?

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Nov 3, 2014

I wanted to try out using a KeyListener to read what key I press so it can paint a circle in my frame, but I can't get it to work?

import java.awt.Color;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import java.util.Random;

[Code] ....

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