Thread: event programming - controlling characters with arrow/keyboard keys

hi,
i'm writing a user-controlled game for a project, but somehow I can't seem to enter anything (as in, when user presses a key nothing happens). is there anything that i'm missing/should learn to fix this? thanks in advance

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import java.util.Scanner;
import java.awt.Font;
import java.awt.GraphicsEnvironment;
import java.util.ArrayList;
import java.awt.event.*;
import javax.swing.*;
 
class Game extends JFrame implements KeyListener {
    //public void init() {
      //  this.addKeyListener(this);
    // }
    public void keyPressed(KeyEvent e) {
        double hx = 100, hy = 150; // starting (x,y) coordinate position
        double px = 15.0, py = 150; // starting (x,y) coordinate position
        // hades controls
        if ((e.getKeyCode() == KeyEvent.VK_UP) | (e.getKeyCode() == KeyEvent.VK_KP_DOWN)) hy += 2; 
        if ((e.getKeyCode() == KeyEvent.VK_LEFT) | (e.getKeyCode() == KeyEvent.VK_KP_DOWN)) hx -= 2; 
        if ((e.getKeyCode() == KeyEvent.VK_DOWN) | (e.getKeyCode() == KeyEvent.VK_KP_DOWN)) hy -= 2;
        if ((e.getKeyCode() == KeyEvent.VK_RIGHT) | (e.getKeyCode() == KeyEvent.VK_KP_DOWN)) hx += 2;
        // persephone controls
        if (e.getKeyCode() == KeyEvent.VK_W) py += 2;
        if (e.getKeyCode() == KeyEvent.VK_A) px -= 2;
        if (e.getKeyCode() == KeyEvent.VK_S) py -= 2;
        if (e.getKeyCode() == KeyEvent.VK_D) px += 2;
        // draw stuff, REMEMBER EXCEPTIONS (WITH WALL)
        StdDraw.setPenColor(StdDraw.BLACK);
        StdDraw.filledSquare(hx,hy,15); // hades; pen radius is 0.5
        StdDraw.filledSquare(px,py,15); // persephone
        StdDraw.show();
    }
    public void keyReleased(KeyEvent e) {
    }
    public void keyTyped(KeyEvent e) { // if typed b, then quit
    }
    public void newGame(String command) { // ... code omitted
    }
    /**
     * empty constructor for Game class
     */
    public static void Game(String[] args)
    {
        //code
    } 
}

thanks for the note! I was wondering if there should be some kind of wait method called when i draw the characters? (this is the case in python, and i'm unsure if it translates to java)

ah ok thank you though, i'll go read up on JPanel/key listeners
it (i.e. making the components focusable) should work even if it isn't a textbox, right? because i am using objects of my own designed classes to interact with each other