求助:在GUI设计方面能不能模拟方向键,如手机的方向键

Question

求助:
请问在GUI设计方面能不能模拟方向键,如手机的方向键.能给段代码吗?新手啊,多多关照.谢谢啊!

Answer 1

/*写了个小程序,通过键盘的方向键控制红色的圆球(标签)上下左右运动.不知道是否实现你的想法*/import java.awt.*;
import java.awt.geom.*;
import java.awt.event.*;
import javax.swing.*;public class DirectionListener extends JFrame{
private int x,y;
public Piece piece;
public DirectionListener(){
x=0;
y=0;
piece=new Piece();
Container cp=getContentPane();
cp.setBackground(new Color(175,175,175));
setSize(600,600);
cp.add(piece);KeyAdapter keyHandler=new KeyAdapter(){
public void keyPressed(KeyEvent e){
switch(e.getKeyCode()){
                case KeyEvent.VK_DOWN:
                     y +=20;
                     piece.setLocation(x,y);
                     break;
                case KeyEvent.VK_LEFT:
                     x -=20;
                     piece.setLocation(x,y);
                     break;
                case KeyEvent.VK_RIGHT:
                     x +=20;
                     piece.setLocation(x,y);                     break;
                case KeyEvent.VK_UP:
                     y -=20;
                     piece.setLocation(x,y);
                     break;
                    
                default:
                    break;
                    
            }
}
};
addKeyListener(keyHandler);  
}
public static void main(String[] args){
  DirectionListener frame=new DirectionListener();
  frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
  frame.setVisible(true);
}
private class Piece extends JLabel{
public void paintComponent(Graphics g){
super.paintComponent(g);
Graphics2D g2=(Graphics2D)g;
g2.setPaint(Color.RED);
g2.fill(new Ellipse2D.Double(0,0,30,30));
}
}
}