如何在循环中调用keyPressed（）方法？

Question

How can I call the method keyPressed(KeyListener evt) in a loop? I want to programm a simple 2D java game, and here is my code of the keyPressed method:

private void KeyPressed(java.awt.event.KeyEvent evt) {

    key = evt.getKeyCode();

        if (key == KeyEvent.VK_W) {

            direction = 1;

            PlayerMovement();
        }
        if (key == KeyEvent.VK_S) {

            direction = 2;

            PlayerMovement();
        }
        if (key == KeyEvent.VK_D) {

            direction = 3;
        }
}

Answer 1

public class GameLoop implements Runnable {
    public void run() {
        //initialization goes here
        while(running){
            processInput();
            update();
            render();
        }
    } 
    processUpdate() {
         //here you listen to inputs
    }
}

You can set a couple booleans to track the keys are currently pressed down. For example set movingRight = true; if D is pressed and set movingRight = false; if D is released. In update you update your positions according to keys are currently pressed.

However a game loop should cointain a lot more. This is just a very basic model.

About game loops: http://gameprogrammingpatterns.com/game-loop.html

Answer 2

i told you have to use THREADS because here you are using the program but if you start a thread you can do what ever you want the program still works fine learn about thread because game are all about threads

private class Walk_thread extends java.lang.Thread{

public void run(){
//call the walk methode here
PlayerMovement();
}
}

so when the key is pressed create a thread that call playermovement

if (key == KeyEvent.VK_W) {

        direction = 1;
new Walk_thread().start();//here the method run is called 
System.out.println("program will not stop the thread is walking and the program is continued too");
    }