我正在尝试制作一个基本地图，按下按钮移动一个角色。我正在使用 Netbeans，到目前为止一切顺利！除了尝试从 JPanel 中删除 JLabel，然后向其中添加新的 JLabel。
这是我的完整代码：
import java.awt.event.*;
import java.awt.*;
import javax.swing.*;
public class startMap extends JFrame {
public int locX = 1;
public int locY = 1;
ImageIcon tile = new ImageIcon("src/tile.png");
JLabel tileLabel = new JLabel(tile);
ImageIcon berry = new ImageIcon("src/berry.png");
JLabel berryLabel = new JLabel(berry);
ImageIcon blank = new ImageIcon("src/blank.png");
JLabel blankLabel = new JLabel(blank);
JLabel testL = new JLabel("LOL");
JPanel[][] map = new JPanel[7][7];
public startMap() {
setBackground(Color.BLACK);
setFocusable(true);
keyHandler kh = new keyHandler();
addKeyListener(kh);
mapGUI();
}
public void mapGUI() {
JPanel mainP = new JPanel();
mainP.setBackground(Color.BLACK);
mainP.setLayout(new FlowLayout());
for (int x = 0; x < 7; x++) {
for (int i = 0; i < 7; i++) {
map[x][i] = new JPanel();
System.out.println("1");
blankLabel = new JLabel(blank);
map[x][i].setBorder(BorderFactory.createLineBorder(Color.BLACK, 2));
map[x][i].add(blankLabel);
}
}
for (int x = 1; x < 6; x++) {
for (int i = 1; i < 6; i++) {
System.out.println("2");
map[x][i].removeAll();
revalidate();
repaint();
tileLabel = new JLabel(tile);
map[x][i].add(tileLabel);
revalidate();
repaint();
}
}
System.out.println("3");
map[locX][locY].removeAll();
revalidate();
repaint();
map[locX][locY].add(berryLabel);
revalidate();
repaint();
for (int x = 0; x < 7; x++) {
for (int i = 0; i < 7; i++) {
mainP.add(map[x][i]);
}
}
add(mainP);
}
@Override
public void paint(Graphics g) {
super.paint(g);
}
private class keyHandler extends KeyAdapter {
@Override
public void keyPressed(KeyEvent e) {
if (e.getKeyCode() == KeyEvent.VK_RIGHT) {
locY+=1;
map[locX][locY].removeAll();
revalidate();
repaint();
map[locX][locY].add(berryLabel);
revalidate();
repaint();
}
}
}
}
这是用户单击“右”时正方形的变化。
这是 KeyAdapter 代码：
private class keyHandler extends KeyAdapter {
@Override
public void keyPressed(KeyEvent e) {
if (e.getKeyCode() == KeyEvent.VK_RIGHT) {
locY+=1;
map[locX][locY].removeAll();
revalidate();
repaint();
map[locX][locY].add(berryLabel);
revalidate();
repaint();
}
}}
注意：系统输出只是我用来检查什么时候被调用的调试方法。
所以当我运行它看起来像这样
向右移动并重新验证 $ repaint：
为什么位于 1,1 的盒子会变成灰色？
帮助弄清楚如何使框保持白色方块而不是变回灰色。
----------------------------------------SSCCE------------------------ -------------
使用上面的完整代码，这是主类：
import javax.swing.*;
public class TestGame extends JFrame {
public static void main(String[] args) {
startMap sm = new startMap();
sm.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
sm.setVisible(true);
sm.setSize(380,415);
sm.setResizable(false);
}
}
固定版本：
import java.awt.event.*;
import java.awt.*;
import javax.swing.*;
public class startMap extends JFrame {
public int locX = 1;
public int locY = 1;
ImageIcon tile = new ImageIcon("src/tile.png");
JLabel tileLabel = new JLabel(tile);
ImageIcon berry = new ImageIcon("src/berry.png");
JLabel berryLabel = new JLabel(berry);
ImageIcon blank = new ImageIcon("src/blank.png");
JLabel blankLabel = new JLabel(blank);
JLabel testL = new JLabel("LOL");
JPanel[][] map = new JPanel[7][7];
public startMap() {
setBackground(Color.BLACK);
setFocusable(true);
keyHandler kh = new keyHandler();
addKeyListener(kh);
mapGUI();
}
public void mapGUI() {
JPanel mainP = new JPanel();
mainP.setBackground(Color.BLACK);
mainP.setLayout(new FlowLayout());
for (int x = 0; x < 7; x++) {
for (int i = 0; i < 7; i++) {
map[x][i] = new JPanel();
System.out.println("1");
blankLabel = new JLabel(blank);
map[x][i].setBorder(BorderFactory.createLineBorder(Color.BLACK, 2));
map[x][i].add(blankLabel);
}
}
for (int x = 1; x < 6; x++) {
for (int i = 1; i < 6; i++) {
System.out.println("2");
map[x][i].removeAll();
tileLabel = new JLabel(tile);
map[x][i].add(tileLabel);
revalidate();
repaint();
}
}
System.out.println("3");
map[locX][locY].removeAll();
map[locX][locY].add(berryLabel);
revalidate();
repaint();
for (int x = 0; x < 7; x++) {
for (int i = 0; i < 7; i++) {
mainP.add(map[x][i]);
}
}
add(mainP);
}
@Override
public void paint(Graphics g) {
super.paint(g);
}
private class keyHandler extends KeyAdapter {
@Override
public void keyPressed(KeyEvent e) {
if (e.getKeyCode() == KeyEvent.VK_RIGHT) {
berryLabel = new JLabel(berry); //THIS
tileLabel = new JLabel(tile); //And THIS had to be RE initialized idk why.
map[locX][locY].removeAll();
map[locX][locY].add(tileLabel);
locY += 1;
map[locX][locY].removeAll();
map[locX][locY].add(berryLabel);
revalidate();
repaint();
}
}
}
}