[英]Cannot move a JLabel with the arrow keys
So I'm trying to make a JLabel ("player") move 10 px in a direction I choose as you can see in the code below, but I just can't make it work. 因此,我正在尝试使JLabel(“玩家”)沿我选择的方向移动10像素,如下面的代码所示,但是我无法使其工作。 I've run it and pressed an arrow key but nothing happened so I was hoping you guys could help me ^^.
我已经运行它并按下箭头键,但是什么也没发生,所以我希望你们能帮助我^^。
import javax.swing.*;
import java.awt.*;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;
import java.util.Random;
public class Main extends JFrame {
JLabel player = new JLabel();
JLabel separator = new JLabel();
JLabel object = new JLabel();
public Main() {
setSize(400, 500);
setLayout(null);
setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
setLocationRelativeTo(null);
setTitle("BenTY");
separator.setOpaque(true);
separator.setBackground(Color.black);
separator.setBounds(0, 400, 400, 1);
add(separator);
player.setBackground(Color.black);
player.setOpaque(true);
player.setBounds(195, 390, 10, 10);
player.addKeyListener(new KeyAdapter() {
@Override
public void keyPressed(KeyEvent ke)
{
if(ke.getKeyCode() == KeyEvent.VK_DOWN)
{
player.setBounds(player.getX(), player.getY()+10, 10, 10);
repaint();
}
if(ke.getKeyCode() == KeyEvent.VK_UP)
{
player.setLocation(player.getX(), player.getY() - 10);
repaint();
}
if(ke.getKeyCode() == KeyEvent.VK_LEFT)
{
player.setLocation(player.getX()-10,player.getY());
repaint();
}
if(ke.getKeyCode() == KeyEvent.VK_RIGHT)
{
player.setLocation(player.getX()+10,player.getY());
repaint();
}
}
});
add(player);
Random random = new Random();
int oLocationX = random.nextInt(40) * 10;
int oLocationY = random.nextInt(40) * 10;
object.setBackground(Color.red);
object.setOpaque(true);
object.setBounds(oLocationX, oLocationY, 10, 10);
add(object);
}
public static void main(String[] args) {
Main ui = new Main();
ui.setVisible(true);
}
}
BTW sorry for poor coding :D 顺便说一句不好意思编码:D
you would need to use KeyBindings instead of low_level KeyListener 您将需要使用KeyBindings而不是low_level KeyListener
Player (be sure that all JComponents) need to be setFocusable() for KeyListener , otherwise KeyListener
doesn't works, its need the Focus in the Components tree Player(请确保所有JComponents)都需要为KeyListener设置setFocusable() ,否则
KeyListener
不起作用,它需要在Components树中聚焦
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