-1
我正在寫一個國際象棋程序，而我正處於推動一個棋子的地步。當一個棋子到達最後一級時，應該彈出一個新的jframe，允許用戶選擇他希望棋子被提升到什麼樣的位置。問題是，當我從我的主要方法創建這個框架時，它顯示得很好，但是當我在我的mouselistener代碼中創建它時，它在屏幕上顯示它背後的確切內容，並且我不知道爲什麼。這裏是我的相關代碼：JFrame顯示不正確的內容
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.border.*;
public class Example extends JFrame {
private SquarePanel[][] squares;
private Colors colors;
public Example() {
super();
colors = new Colors();
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
Container con = this.getContentPane();
setSize(800,800);
setLocation(0,0);
con.setLayout(new GridLayout(8,8));
SquarePanel pane = null;
SquarePanel lastpanel = null;
squares = new SquarePanel[8][8];
int color = colors.WHITE;
for(int i = 7; i >= 0; --i) {
if(color == colors.WHITE)
color = colors.BLACK;
else
color = colors.WHITE;
for(int j = 0; j <= 7; ++j) {
if(color == colors.WHITE)
color = colors.BLACK;
else
color = colors.WHITE;
lastpanel = new SquarePanel(color,j,i);
pane = lastpanel;
con.add(pane);
squares[j][i] = pane;
}
}
for(int i = 0; i < 8; ++i) {
for(int j = 0; j < 8; ++j) {
squares[j][i].setResident("pawn");
//System.out.println(squares[j][i].getResident());
//squares[j][i].repaint();
}
}
MouseListener listener = new MoveListener(this, squares);
for(int i = 0; i < 8; ++i)
for(int j = 0; j < 8; ++j)
squares[i][j].addMouseListener(listener);
setVisible(true);
PromotionFrame pf = new PromotionFrame(this, 1);
String p = null;
while(p == null) {
p = pf.getPiece();
}
pf.dispose();
}
public class SquarePanel extends JPanel {
private ImageIcon content;
private int x;
private int y;
private int color;
private String resident;
private Colors colors;
public SquarePanel(int color, int x, int y) {
content = null;
resident = null;
this.color = color;
colors = new Colors();
this.x = x;
this.y = y;
Border blackline = BorderFactory.createLineBorder(Color.black);
setBorder(blackline);
this.setLayout(new GridBagLayout());
}
public void paintComponent(Graphics g) {
super.paintComponent(g);
int width = getWidth();
int height = getHeight();
if(color == colors.WHITE)
g.setColor(Color.white);
else
g.setColor(Color.green);
g.fillRect(0, 0, width, height);
g.setColor(Color.black);
//System.out.println("here");
}
public String getResident() {
return resident;
}
public void setResident(String p) {
resident = p;
if(p == null)
removeAll();
else
add(new JLabel(p));
}
public int getXCoordinate() {
return x;
}
public int getYCoordinate() {
return y;
}
}
private class Colors {
public int BLACK = 0;
public int WHITE = 1;
}
public class MoveListener implements MouseListener {
private int first_click;
private SquarePanel first_source;
private JFrame frame;
private int turn;
private SquarePanel[][] squares;
public MoveListener(JFrame f, SquarePanel[][] s) {
first_click = 0;
this.frame = f;
turn = colors.WHITE;
squares = s;
}
/* Empty method definition. */
public void mousePressed(MouseEvent e) {
SquarePanel p = (SquarePanel)e.getSource();
ImageIcon content = null;
if(first_click == 0) {
first_source = p;
++first_click;
p.setBorder(BorderFactory.createLineBorder(Color.cyan,4));
}
else {
first_click = 0;
first_source.setBorder(BorderFactory.createLineBorder(Color.black));
//System.out.println(turn == colors.WHITE ? "White" : "Black");
if(p.getResident().equals("pawn") && (p.getYCoordinate() == 7 || p.getYCoordinate() == 0)) {
PromotionFrame pframe = new PromotionFrame(frame, colors.WHITE);
String piece;
do {
piece = pframe.getPiece();
}
while(piece == null);
System.out.println(piece);
pframe.dispose();
p.setResident(piece);
}
}
}
/* Empty method definition. */
public void mouseReleased(MouseEvent e) {
}
/* Empty method definition. */
public void mouseEntered(MouseEvent e) {
}
/* Empty method definition. */
public void mouseExited(MouseEvent e) {
}
public void mouseClicked(MouseEvent e) {
}
}
public class PromotionFrame extends JFrame implements MouseListener {
private JFrame master;
private String piece;
public PromotionFrame(JFrame master, int color) {
super();
this.setDefaultCloseOperation(JFrame.DO_NOTHING_ON_CLOSE);
Container con = this.getContentPane();
setSize(400,200);
this.master = master;
setLocation(master.getX()+master.getWidth()/2-200,master.getY()+master.getHeight()/2-100);
setLocation(0,0);
con.setLayout(new GridLayout(1,4));
ImageIcon imgicon1;
Image img1;
Image newimg;
ImageIcon img;
ImageLabel label;
piece = null;
label = new ImageLabel("queen");
label.addMouseListener(this);
con.add(label);
label = new ImageLabel("rook");
label.addMouseListener(this);
con.add(label);
label = new ImageLabel("bishop");
label.addMouseListener(this);
con.add(label);
label = new ImageLabel("knight");
label.addMouseListener(this);
con.add(label);
this.show();
}
public String getPiece() {
return piece;
}
/* Empty method definition. */
public void mousePressed(MouseEvent e) {
ImageLabel label = (ImageLabel)e.getSource();
piece = label.getPiece();
}
/* Empty method definition. */
public void mouseReleased(MouseEvent e) {
}
/* Empty method definition. */
public void mouseEntered(MouseEvent e) {
}
/* Empty method definition. */
public void mouseExited(MouseEvent e) {
}
public void mouseClicked(MouseEvent e) {
}
private class ImageLabel extends JLabel {
private String piece;
ImageLabel(String piece) {
super(piece);
this.piece = piece;
}
public String getPiece() {
return piece;
}
}
}
public static void main(String[] args) {
new Example();
}
}
爲了更好地幫助越早，發佈[SSCCE]（http://pscode.org/sscce.html）。 –
你確定**全部**這段代碼與問題嚴格相關嗎？ – Vlad
太多的代碼來看看和理解你在做什麼。一個評論是你不應該在你的GUI的主線上有一個do/while循環。 – camickr