java - 在java.awt.AWTEventMulticaster.mouseExited(AWTEventMulticaster.java :309)

Question

我已经发布了我的代码。我无法理解问题的根本原因在哪里。这是我一直在尝试制作的 java chess Engine 的 UI 代码。如果我幸运或速度快的话，该应用程序运行大约 4-5 次移动和 8-9 次移动。最终，当我移动鼠标时，我遇到了一系列无限的错误。我认为我的代码在某个地方正在创建 mouseListeners 的多个实例，我认为这是不应该发生的。请指导我该怎么做。

import javax.swing.*;
    import java.awt.*;
    import java.awt.event.MouseEvent;
    import java.awt.event.MouseListener;
    import java.awt.event.MouseMotionListener;

    public class UserInterface extends JPanel implements MouseListener, MouseMotionListener {
        static int mouseX, mouseY, newMouseX, newMouseY;
        static int squareSize = 32;

        @Override
        protected void paintComponent(Graphics g) {
            super.paintComponent(g);
            this.setBackground(new Color(120, 100, 45));
            this.addMouseListener(this);
            this.addMouseMotionListener(this);
            for (int i = 0; i < 64; i += 2) {
                g.setColor(new Color(255, 200, 100));
                g.fillRect((i % 8 + (i / 8) % 2) * squareSize, (i / 8) * squareSize, squareSize, squareSize);
                g.setColor(new Color(150, 50, 30));
                g.fillRect(((i + 1) % 8 - ((i + 1) / 8) % 2) * squareSize, ((i + 1) / 8) * squareSize, squareSize, squareSize);
            }
            Image chessPiecesImage;
            chessPiecesImage = new ImageIcon("ChessPieces.png").getImage();

            for (int i = 0; i < 64; i++) {
                int j = -1, k = -1;
                switch (alphaBetaChess.chessBoard[i / 8][i % 8]) {
                    case "P":
                        j = 5;
                        k = 0;
                        break;
                    case "p":
                        j = 5;
                        k = 1;
                        break;
                    case "R":
                        j = 2;
                        k = 0;
                        break;
                    case "r":
                        j = 2;
                        k = 1;
                        break;
                    case "K":
                        j = 4;
                        k = 0;
                        break;
                    case "k":
                        j = 4;
                        k = 1;
                        break;
                    case "B":
                        j = 3;
                        k = 0;
                        break;
                    case "b":
                        j = 3;
                        k = 1;
                        break;
                    case "Q":
                        j = 1;
                        k = 0;
                        break;
                    case "q":
                        j = 1;
                        k = 1;
                        break;
                    case "A":
                        j = 0;
                        k = 0;
                        break;
                    case "a":
                        j = 0;
                        k = 1;
                        break;
                }
                if (j != -1 && k != -1) {
                    g.drawImage(chessPiecesImage, (i % 8) * squareSize, (i / 8) * squareSize, (i % 8 + 1) * squareSize, (i / 8 + 1) * squareSize, j * 64, k * 64, (j + 1) * 64, (k + 1) * 64, this);
                }
            }
            repaint();
    //      g.setColor(Color.black);
    //      g.fillRect(x, y,500/8,500/8);
        }

        @Override
        public void mouseMoved(MouseEvent e) {
        }

        @Override
        public void mousePressed(MouseEvent e) {
            if (e.getX() < 8 * squareSize && e.getY() < 8 * squareSize) {
                //if inside the board
                mouseX = e.getX();
                mouseY = e.getY();
                repaint();
            }
        }

        @Override
        public void mouseReleased(MouseEvent e) {
            if (e.getX() < 8 * squareSize && e.getY() < 8 * squareSize) {
                //if inside the board
                newMouseX = e.getX();
                newMouseY = e.getY();
                if (e.getButton() == MouseEvent.BUTTON1) {
                    String dragMove;
                    if (newMouseY / squareSize == 0 && mouseY / squareSize == 1 && "P".equals(alphaBetaChess.chessBoard[mouseY / squareSize][mouseX / squareSize])) {
                        //pawn promotion
                        dragMove = "" + mouseX / squareSize + newMouseX / squareSize + alphaBetaChess.chessBoard[newMouseY / squareSize][newMouseX / squareSize] + "QP";
                    } else {
                        //regular move
                        dragMove = "" + mouseY / squareSize + mouseX / squareSize + newMouseY / squareSize + newMouseX / squareSize + alphaBetaChess.chessBoard[newMouseY / squareSize][newMouseX / squareSize];
                    }
                    String userPosibilities = alphaBetaChess.possibleMoves();
                    if (userPosibilities.replaceAll(dragMove, "").length() < userPosibilities.length()) {
                        //if valid move
                        alphaBetaChess.makeMove(dragMove);
                        alphaBetaChess.flipBoard();
                        alphaBetaChess.makeMove(alphaBetaChess.alphaBeta(alphaBetaChess.globalDepth, 1000000, -1000000, "", 0));
                        alphaBetaChess.flipBoard();
                        repaint();
                    }
                }
            }
        }

        @Override
        public void mouseClicked(MouseEvent e) {
        }

        @Override
        public void mouseDragged(MouseEvent e) {
        }

        @Override
        public void mouseEntered(MouseEvent e) {
        }

        @Override
        public void mouseExited(MouseEvent e) {
        }
    }

Answer 1

添加鼠标监听器，并在构建面板的地方添加运动监听器。这样就不会多次创建运动监听器。