import java.awt.*; import java.awt.event.*; public class MobileControls extends Frame implements KeyListener, FocusListener { boolean left = false; boolean right = false; boolean up = false; boolean down = false; public MobileControls() { addKeyListener(this); addFocusListener(this); setTitle("王者荣耀移动轮盘"); setSize(200, 200); setVisible(true); } public void keyPressed(KeyEvent e) { switch (e.getKeyCode()) { case KeyEvent.VK_LEFT: left = true; break; case KeyEvent.VK_RIGHT: right = true; break; case KeyEvent.VK_UP: up = true; break; case KeyEvent.VK_DOWN: down = true; break; } redraw(); } public void keyReleased(KeyEvent e) { switch (e.getKeyCode()) { case KeyEvent.VK_LEFT: left = false; break; case KeyEvent.VK_RIGHT: right = false; break; case KeyEvent.VK_UP: up = false; break; case KeyEvent.VK_DOWN: down = false; break; } redraw(); } public void keyTyped(KeyEvent e) { } public void focusGained(FocusEvent e) { redraw(); } public void focusLost(FocusEvent e) { left = false; right = false; up = false; down = false; redraw(); } public void paint(Graphics g) { Dimension d = getSize(); int x = d.width / 2; int y = d.height / 2; int r = 40; g.drawOval(x - r, y - r, r * 2, r * 2); if (left) { g.drawLine(x - r, y, x - r - 10, y); } if (right) { g.drawLine(x + r, y, x + r + 10, y); } if (up) { g.drawLine(x, y - r, x, y - r - 10); } if (down) { g.drawLine(x, y + r, x, y + r + 10); } } public void redraw() { repaint(); } public static void main(String[] args) { MobileControls controls = new MobileControls(); } }我要怎么运行这段代码

你需要将这段代码复制到一个 Java 代码编辑器中，然后保存为一个名为 "MobileControls.java" 的文件。接着，你需要在命令行中进入该文件所在的目录，并使用 Java 编译器编译它，命令为：javac MobileControls.java。编译成功后，你可以直接在命令行中运行它，命令为：java MobileControls。然后你就可以在窗口中使用键盘按键模拟一个移动轮盘了。