package demos.nehe.lesson47;import demos.common.GLDisplay;import javax.swing.*;import java.awt.event.KeyAdapter;import java.awt.event.KeyEvent;class InputHandler extends KeyAdapter {    private Renderer renderer;    public InputHandler(Renderer renderer, GLDisplay display) {        this.renderer = renderer;        display.registerKeyStrokeForHelp(KeyStroke.getKeyStroke(KeyEvent.VK_SPACE, 0), "Toggle shader");    }    public void keyReleased(KeyEvent e) {        switch (e.getKeyCode()) {            // Toggle properties            case KeyEvent.VK_SPACE:                renderer.toggleShader();                break;        }    }}