TIC TAC TOE 消去版

最近在翻学长留下的资料，发现了一个很奇怪的TIC TAC TOE的实现：

• 两个玩家，一个打叉(X)，一个打圈(O)， 轮流在3乘3的格上打自己的符号，最先以横、直、斜连成一线则为胜。下图是一个X方取胜的例子。
• 
• 因为旧玩法如果下法无误，将得和局，所以出现变化，新玩法是在下完第七子时(先方第四子)，最初的第一子要消失，第八子下完第二子消失，以此类推，保持盘上只有六子，下子后必须先处理消失之子，方可判断是否连成一条线。

不知道是不是自己比较笨，第二种是现实想了好久好久(⊙﹏⊙)b，但总算还是想出来了：主要是用ArrayList + Comparable的借口实现排序（感觉说起来很简单的样子，不知道为什么搞了两天多）。。。

现在的问题就是：

• 代码繁杂：不少地方用了类似的代码段，但其中有些细微的差别，貌似不能用函数来笼统解决这个问题，让我很无奈；

• 记录步数有限：由于用了一个全局变量来记录总步数并将步数分配到每个按键上，导致最终的游戏总步数有限（虽然我想2^31-1步没人能玩下来），姑且算一个不足。

  希望各位大大给出建议~

代码如下：

import javax.swing.*;
import java.awt.*;
import java.util.List;
import java.awt.event.*;
import java.util.*;

class ButtonX extends Button implements Comparable{
    int btID = 0;

    public int compareTo(ButtonX other){
        if(this.btID < other.btID) return -1;
        if(this.btID == other.btID) return 0;
        return 1;
    }
}

public class TicMain extends Frame {
    public static final int GAME_SIZE = 450;
    public static final int DISAPPEAR_START = 6;
    int totalStep = 0;
    ButtonX bt1, bt2, bt3, bt4, bt5, bt6, bt7, bt8, bt9;
    boolean player = true;

    List btList = new ArrayList();

    public void launchFrame() {
        this.setLayout(new GridLayout(3, 3, 0, 0));
        this.setTitle("TicTacToe! By CasterKKK");
        this.setLocation(400, 400);
        this.setSize(GAME_SIZE, GAME_SIZE);
        this.setBackground(Color.WHITE);
        this.addWindowListener(new WindowAdapter() {
            public void windowClosing(WindowEvent e) {
                System.exit(0);
            }
        });
        this.setVisible(true);
        this.setResizable(false);

        bt1 = new ButtonX();
        bt1.btID = Integer.MAX_VALUE;
        btList.add(bt1);
        add(bt1);
        bt2 = new ButtonX();
        bt2.btID = Integer.MAX_VALUE;
        btList.add(bt2);
        add(bt2);
        bt3 = new ButtonX();
        bt3.btID = Integer.MAX_VALUE;
        btList.add(bt3);
        add(bt3);
        bt4 = new ButtonX();
        bt4.btID = Integer.MAX_VALUE;
        btList.add(bt4);
        add(bt4);
        bt5 = new ButtonX();
        bt5.btID = Integer.MAX_VALUE;
        btList.add(bt5);
        add(bt5);
        bt6 = new ButtonX();
        bt6.btID = Integer.MAX_VALUE;
        btList.add(bt6);
        add(bt6);
        bt7 = new ButtonX();
        bt7.btID = Integer.MAX_VALUE;
        btList.add(bt7);
        add(bt7);
        bt8 = new ButtonX();
        bt8.btID = Integer.MAX_VALUE;
        btList.add(bt8);
        add(bt8);
        bt9 = new ButtonX();
        bt9.btID = Integer.MAX_VALUE;
        btList.add(bt9);
        add(bt9);

        bt1.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                /**
                 * Actually it is the first version of the TicTacToe. In this
                 * version, you can put mostly nine chess pieces at all, and the
                 * next version is focused on a new chessing process: the
                 * chessboard can put six chess at all, while put on the seventh
                 * chess piece, the first one will gone.
                 */
                // The first version
                // if (player && bt1.getLabel() == "") {
                // bt1.setLabel("X");
                // player = !player;
                // } else if (!player && bt1.getLabel() == "") {
                // bt1.setLabel("O");
                // player = !player;
                // }

                // The second version
                if (totalStep < DISAPPEAR_START && bt1.getLabel() == "") {
                    if (player) {
                        bt1.setLabel("X");
                        player = !player;
                        totalStep++;
                        bt1.btID = totalStep;
                    } else if (!player) {
                        bt1.setLabel("O");
                        player = !player;
                        totalStep++;
                        bt1.btID = totalStep;
                    }
                } else {
                    Collections.sort(btList);
                    btList.get(0).setLabel("");
                    btList.get(0).btID = Integer.MAX_VALUE;
                    if (player) {
                        bt1.setLabel("X");
                        player = !player;
                        totalStep++;
                        bt1.btID = totalStep;
                    } else if (!player) {
                        bt1.setLabel("O");
                        player = !player;
                        totalStep++;
                        bt1.btID = totalStep;
                    }
                }

                if (checkWin(bt1.getLabel(), bt2.getLabel(), bt3.getLabel(), bt4.getLabel(), bt5.getLabel(),
                        bt6.getLabel(), bt7.getLabel(), bt8.getLabel(), bt9.getLabel()) == 1) {
                    JOptionPane.showMessageDialog(null, "X wins! One more game?");
                    initGame();
                } else if (checkWin(bt1.getLabel(), bt2.getLabel(), bt3.getLabel(), bt4.getLabel(), bt5.getLabel(),
                        bt6.getLabel(), bt7.getLabel(), bt8.getLabel(), bt9.getLabel()) == -1) {
                    JOptionPane.showMessageDialog(null, "O wins! One more game?");
                    initGame();
                } else if (checkWin(bt1.getLabel(), bt2.getLabel(), bt3.getLabel(), bt4.getLabel(), bt5.getLabel(),
                        bt6.getLabel(), bt7.getLabel(), bt8.getLabel(), bt9.getLabel()) == 0) {
                    JOptionPane.showMessageDialog(null, "Equal! One more game?");
                    initGame();
                }
            }
        });
        bt2.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
//              The first version
//              if (player && bt2.getLabel() == "") {
//                  bt2.setLabel("X");
//                  player = !player;
//              } else if (!player && bt2.getLabel() == "") {
//                  bt2.setLabel("O");
//                  player = !player;
//              }

                // The second version
                if (totalStep < DISAPPEAR_START && bt2.getLabel() == "") {
                    if (player) {
                        bt2.setLabel("X");
                        player = !player;
                        totalStep++;
                        bt2.btID = totalStep;
                    } else if (!player) {
                        bt2.setLabel("O");
                        player = !player;
                        totalStep++;
                        bt2.btID = totalStep;
                    }
                } else {
                    Collections.sort(btList);
                    btList.get(0).setLabel("");
                    btList.get(0).btID = Integer.MAX_VALUE;
                    if (player) {
                        bt2.setLabel("X");
                        player = !player;
                        totalStep++;
                        bt2.btID = totalStep;
                    } else if (!player) {
                        bt2.setLabel("O");
                        player = !player;
                        totalStep++;
                        bt2.btID = totalStep;
                    }
                }

                if (checkWin(bt1.getLabel(), bt2.getLabel(), bt3.getLabel(), bt4.getLabel(), bt5.getLabel(),
                        bt6.getLabel(), bt7.getLabel(), bt8.getLabel(), bt9.getLabel()) == 1) {
                    JOptionPane.showMessageDialog(null, "X wins! One more game?");
                    initGame();
                } else if (checkWin(bt1.getLabel(), bt2.getLabel(), bt3.getLabel(), bt4.getLabel(), bt5.getLabel(),
                        bt6.getLabel(), bt7.getLabel(), bt8.getLabel(), bt9.getLabel()) == -1) {
                    JOptionPane.showMessageDialog(null, "O wins! One more game?");
                    initGame();
                } else if (checkWin(bt1.getLabel(), bt2.getLabel(), bt3.getLabel(), bt4.getLabel(), bt5.getLabel(),
                        bt6.getLabel(), bt7.getLabel(), bt8.getLabel(), bt9.getLabel()) == 0) {
                    JOptionPane.showMessageDialog(null, "Equal! One more game?");
                    initGame();
                }
            }
        });
        bt3.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
//              First version
//              if (player && bt3.getLabel() == "") {
//                  bt3.setLabel("X");
//                  player = !player;
//              } else if (!player && bt3.getLabel() == "") {
//                  bt3.setLabel("O");
//                  player = !player;
//              }

//          Second version
                if (totalStep < DISAPPEAR_START && bt3.getLabel() == "") {
                    if (player) {
                        bt3.setLabel("X");
                        player = !player;
                        totalStep++;
                        bt3.btID = totalStep;
                    } else if (!player) {
                        bt3.setLabel("O");
                        player = !player;
                        totalStep++;
                        bt3.btID = totalStep;
                    }
                } else {
                    Collections.sort(btList);
                    btList.get(0).setLabel("");
                    btList.get(0).btID = Integer.MAX_VALUE;
                    if (player) {
                        bt3.setLabel("X");
                        player = !player;
                        totalStep++;
                        bt3.btID = totalStep;
                    } else if (!player) {
                        bt3.setLabel("O");
                        player = !player;
                        totalStep++;
                        bt3.btID = totalStep;
                    }
                }

                if (checkWin(bt1.getLabel(), bt2.getLabel(), bt3.getLabel(), bt4.getLabel(), bt5.getLabel(),
                        bt6.getLabel(), bt7.getLabel(), bt8.getLabel(), bt9.getLabel()) == 1) {
                    JOptionPane.showMessageDialog(null, "X wins! One more game?");
                    initGame();
                } else if (checkWin(bt1.getLabel(), bt2.getLabel(), bt3.getLabel(), bt4.getLabel(), bt5.getLabel(),
                        bt6.getLabel(), bt7.getLabel(), bt8.getLabel(), bt9.getLabel()) == -1) {
                    JOptionPane.showMessageDialog(null, "O wins! One more game?");
                    initGame();
                } else if (checkWin(bt1.getLabel(), bt2.getLabel(), bt3.getLabel(), bt4.getLabel(), bt5.getLabel(),
                        bt6.getLabel(), bt7.getLabel(), bt8.getLabel(), bt9.getLabel()) == 0) {
                    JOptionPane.showMessageDialog(null, "Equal! One more game?");
                    initGame();
                }
            }
        });
        bt4.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
//              First version
//              if (player && bt4.getLabel() == "") {
//                  bt4.setLabel("X");
//                  player = !player;
//              } else if (!player && bt4.getLabel() == "") {
//                  bt4.setLabel("O");
//                  player = !player;
//              }

//              Second version
                if (totalStep < DISAPPEAR_START && bt4.getLabel() == "") {
                    if (player) {
                        bt4.setLabel("X");
                        player = !player;
                        totalStep++;
                        bt4.btID = totalStep;
                    } else if (!player) {
                        bt4.setLabel("O");
                        player = !player;
                        totalStep++;
                        bt4.btID = totalStep;
                    }
                } else {
                    Collections.sort(btList);
                    btList.get(0).setLabel("");
                    btList.get(0).btID = Integer.MAX_VALUE;
                    if (player) {
                        bt4.setLabel("X");
                        player = !player;
                        totalStep++;
                        bt4.btID = totalStep;
                    } else if (!player) {
                        bt4.setLabel("O");
                        player = !player;
                        totalStep++;
                        bt4.btID = totalStep;
                    }
                }

                if (checkWin(bt1.getLabel(), bt2.getLabel(), bt3.getLabel(), bt4.getLabel(), bt5.getLabel(),
                        bt6.getLabel(), bt7.getLabel(), bt8.getLabel(), bt9.getLabel()) == 1) {
                    JOptionPane.showMessageDialog(null, "X wins! One more game?");
                    initGame();
                } else if (checkWin(bt1.getLabel(), bt2.getLabel(), bt3.getLabel(), bt4.getLabel(), bt5.getLabel(),
                        bt6.getLabel(), bt7.getLabel(), bt8.getLabel(), bt9.getLabel()) == -1) {
                    JOptionPane.showMessageDialog(null, "O wins! One more game?");
                    initGame();
                } else if (checkWin(bt1.getLabel(), bt2.getLabel(), bt3.getLabel(), bt4.getLabel(), bt5.getLabel(),
                        bt6.getLabel(), bt7.getLabel(), bt8.getLabel(), bt9.getLabel()) == 0) {
                    JOptionPane.showMessageDialog(null, "Equal! One more game?");
                    initGame();
                }
            }
        });
        bt5.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
//              First Version
//              if (player && bt5.getLabel() == "") {
//                  bt5.setLabel("X");
//                  player = !player;
//              } else if (!player && bt5.getLabel() == "") {
//                  bt5.setLabel("O");
//                  player = !player;
//              }

//              Second version
                if (totalStep < DISAPPEAR_START && bt5.getLabel() == "") {
                    if (player) {
                        bt5.setLabel("X");
                        player = !player;
                        totalStep++;
                        bt5.btID = totalStep;
                    } else if (!player) {
                        bt5.setLabel("O");
                        player = !player;
                        totalStep++;
                        bt5.btID = totalStep;
                    }
                } else {
                    Collections.sort(btList);
                    btList.get(0).setLabel("");
                    btList.get(0).btID = Integer.MAX_VALUE;
                    if (player) {
                        bt5.setLabel("X");
                        player = !player;
                        totalStep++;
                        bt5.btID = totalStep;
                    } else if (!player) {
                        bt5.setLabel("O");
                        player = !player;
                        totalStep++;
                        bt5.btID = totalStep;
                    }
                }

                if (checkWin(bt1.getLabel(), bt2.getLabel(), bt3.getLabel(), bt4.getLabel(), bt5.getLabel(),
                        bt6.getLabel(), bt7.getLabel(), bt8.getLabel(), bt9.getLabel()) == 1) {
                    JOptionPane.showMessageDialog(null, "X wins! One more game?");
                    initGame();
                } else if (checkWin(bt1.getLabel(), bt2.getLabel(), bt3.getLabel(), bt4.getLabel(), bt5.getLabel(),
                        bt6.getLabel(), bt7.getLabel(), bt8.getLabel(), bt9.getLabel()) == -1) {
                    JOptionPane.showMessageDialog(null, "O wins! One more game?");
                    initGame();
                } else if (checkWin(bt1.getLabel(), bt2.getLabel(), bt3.getLabel(), bt4.getLabel(), bt5.getLabel(),
                        bt6.getLabel(), bt7.getLabel(), bt8.getLabel(), bt9.getLabel()) == 0) {
                    JOptionPane.showMessageDialog(null, "Equal! One more game?");
                    initGame();
                }
            }
        });
        bt6.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
//              First version
//              if (player && bt6.getLabel() == "") {
//                  bt6.setLabel("X");
//                  player = !player;
//              } else if (!player && bt6.getLabel() == "") {
//                  bt6.setLabel("O");
//                  player = !player;
//              }

//              Second version
                if (totalStep < DISAPPEAR_START && bt6.getLabel() == "") {
                    if (player) {
                        bt6.setLabel("X");
                        player = !player;
                        totalStep++;
                        bt6.btID = totalStep;
                    } else if (!player) {
                        bt6.setLabel("O");
                        player = !player;
                        totalStep++;
                        bt6.btID = totalStep;
                    }
                } else {
                    Collections.sort(btList);
                    btList.get(0).setLabel("");
                    btList.get(0).btID = Integer.MAX_VALUE;
                    if (player) {
                        bt6.setLabel("X");
                        player = !player;
                        totalStep++;
                        bt6.btID = totalStep;
                    } else if (!player) {
                        bt6.setLabel("O");
                        player = !player;
                        totalStep++;
                        bt6.btID = totalStep;
                    }
                }

                if (checkWin(bt1.getLabel(), bt2.getLabel(), bt3.getLabel(), bt4.getLabel(), bt5.getLabel(),
                        bt6.getLabel(), bt7.getLabel(), bt8.getLabel(), bt9.getLabel()) == 1) {
                    JOptionPane.showMessageDialog(null, "X wins! One more game?");
                    initGame();
                } else if (checkWin(bt1.getLabel(), bt2.getLabel(), bt3.getLabel(), bt4.getLabel(), bt5.getLabel(),
                        bt6.getLabel(), bt7.getLabel(), bt8.getLabel(), bt9.getLabel()) == -1) {
                    JOptionPane.showMessageDialog(null, "O wins! One more game?");
                    initGame();
                } else if (checkWin(bt1.getLabel(), bt2.getLabel(), bt3.getLabel(), bt4.getLabel(), bt5.getLabel(),
                        bt6.getLabel(), bt7.getLabel(), bt8.getLabel(), bt9.getLabel()) == 0) {
                    JOptionPane.showMessageDialog(null, "Equal! One more game?");
                    initGame();
                }
            }
        });
        bt7.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
//              First Version
//              if (player && bt7.getLabel() == "") {
//                  bt7.setLabel("X");
//                  player = !player;
//              } else if (!player && bt7.getLabel() == "") {
//                  bt7.setLabel("O");
//                  player = !player;
//              }

//              Second version
                if (totalStep < DISAPPEAR_START && bt7.getLabel() == "") {
                    if (player) {
                        bt7.setLabel("X");
                        player = !player;
                        totalStep++;
                        bt7.btID = totalStep;
                    } else if (!player) {
                        bt7.setLabel("O");
                        player = !player;
                        totalStep++;
                        bt7.btID = totalStep;
                    }
                } else {
                    Collections.sort(btList);
                    btList.get(0).setLabel("");
                    btList.get(0).btID = Integer.MAX_VALUE;
                    if (player) {
                        bt7.setLabel("X");
                        player = !player;
                        totalStep++;
                        bt7.btID = totalStep;
                    } else if (!player) {
                        bt7.setLabel("O");
                        player = !player;
                        totalStep++;
                        bt7.btID = totalStep;
                    }
                }

                if (checkWin(bt1.getLabel(), bt2.getLabel(), bt3.getLabel(), bt4.getLabel(), bt5.getLabel(),
                        bt6.getLabel(), bt7.getLabel(), bt8.getLabel(), bt9.getLabel()) == 1) {
                    JOptionPane.showMessageDialog(null, "X wins! One more game?");
                    initGame();
                } else if (checkWin(bt1.getLabel(), bt2.getLabel(), bt3.getLabel(), bt4.getLabel(), bt5.getLabel(),
                        bt6.getLabel(), bt7.getLabel(), bt8.getLabel(), bt9.getLabel()) == -1) {
                    JOptionPane.showMessageDialog(null, "O wins! One more game?");
                    initGame();
                } else if (checkWin(bt1.getLabel(), bt2.getLabel(), bt3.getLabel(), bt4.getLabel(), bt5.getLabel(),
                        bt6.getLabel(), bt7.getLabel(), bt8.getLabel(), bt9.getLabel()) == 0) {
                    JOptionPane.showMessageDialog(null, "Equal! One more game?");
                    initGame();
                }
            }
        });
        bt8.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
//              Frist version
//              if (player && bt8.getLabel() == "") {
//                  bt8.setLabel("X");
//                  player = !player;
//              } else if (!player && bt8.getLabel() == "") {
//                  bt8.setLabel("O");
//                  player = !player;
//              }

//              Second version
                if (totalStep < DISAPPEAR_START && bt8.getLabel() == "") {
                    if (player) {
                        bt8.setLabel("X");
                        player = !player;
                        totalStep++;
                        bt8.btID = totalStep;
                    } else if (!player) {
                        bt8.setLabel("O");
                        player = !player;
                        totalStep++;
                        bt8.btID = totalStep;
                    }
                } else {
                    Collections.sort(btList);
                    btList.get(0).setLabel("");
                    btList.get(0).btID = Integer.MAX_VALUE;
                    if (player) {
                        bt8.setLabel("X");
                        player = !player;
                        totalStep++;
                        bt8.btID = totalStep;
                    } else if (!player) {
                        bt8.setLabel("O");
                        player = !player;
                        totalStep++;
                        bt8.btID = totalStep;
                    }
                }

                if (checkWin(bt1.getLabel(), bt2.getLabel(), bt3.getLabel(), bt4.getLabel(), bt5.getLabel(),
                        bt6.getLabel(), bt7.getLabel(), bt8.getLabel(), bt9.getLabel()) == 1) {
                    JOptionPane.showMessageDialog(null, "X wins! One more game?");
                    initGame();
                } else if (checkWin(bt1.getLabel(), bt2.getLabel(), bt3.getLabel(), bt4.getLabel(), bt5.getLabel(),
                        bt6.getLabel(), bt7.getLabel(), bt8.getLabel(), bt9.getLabel()) == -1) {
                    JOptionPane.showMessageDialog(null, "O wins! One more game?");
                    initGame();
                } else if (checkWin(bt1.getLabel(), bt2.getLabel(), bt3.getLabel(), bt4.getLabel(), bt5.getLabel(),
                        bt6.getLabel(), bt7.getLabel(), bt8.getLabel(), bt9.getLabel()) == 0) {
                    JOptionPane.showMessageDialog(null, "Equal! One more game?");
                    initGame();
                }
            }
        });
        bt9.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
//              First version
//              if (player && bt9.getLabel() == "") {
//                  bt9.setLabel("X");
//                  player = !player;
//              } else if (!player && bt9.getLabel() == "") {
//                  bt9.setLabel("O");
//                  player = !player;
//              }

//              Second version
                if (totalStep < DISAPPEAR_START && bt9.getLabel() == "") {
                    if (player) {
                        bt9.setLabel("X");
                        player = !player;
                        totalStep++;
                        bt9.btID = totalStep;
                    } else if (!player) {
                        bt9.setLabel("O");
                        player = !player;
                        totalStep++;
                        bt9.btID = totalStep;
                    }
                } else {
                    Collections.sort(btList);
                    btList.get(0).setLabel("");
                    btList.get(0).btID = Integer.MAX_VALUE;
                    if (player) {
                        bt9.setLabel("X");
                        player = !player;
                        totalStep++;
                        bt9.btID = totalStep;
                    } else if (!player) {
                        bt9.setLabel("O");
                        player = !player;
                        totalStep++;
                        bt9.btID = totalStep;
                    }
                }

                if (checkWin(bt1.getLabel(), bt2.getLabel(), bt3.getLabel(), bt4.getLabel(), bt5.getLabel(),
                        bt6.getLabel(), bt7.getLabel(), bt8.getLabel(), bt9.getLabel()) == 1) {
                    JOptionPane.showMessageDialog(null, "X wins! One more game?");
                    initGame();
                } else if (checkWin(bt1.getLabel(), bt2.getLabel(), bt3.getLabel(), bt4.getLabel(), bt5.getLabel(),
                        bt6.getLabel(), bt7.getLabel(), bt8.getLabel(), bt9.getLabel()) == -1) {
                    JOptionPane.showMessageDialog(null, "O wins! One more game?");
                    initGame();
                } else if (checkWin(bt1.getLabel(), bt2.getLabel(), bt3.getLabel(), bt4.getLabel(), bt5.getLabel(),
                        bt6.getLabel(), bt7.getLabel(), bt8.getLabel(), bt9.getLabel()) == 0) {
                    JOptionPane.showMessageDialog(null, "Equal! One more game?");
                    initGame();
                }
            }
        });
    }

    public int checkWin(String bt1, String bt2, String bt3, String bt4, String bt5, String bt6, String bt7, String bt8,
                        String bt9) {
        if (((bt1 == bt2 && bt1 == bt3 && bt1 == "X") || (bt4 == bt5 && bt4 == bt6 && bt4 == "X")
                || (bt7 == bt8 && bt7 == bt9 && bt7 == "X") || (bt1 == bt4 && bt1 == bt7 && bt1 == "X")
                || (bt2 == bt5 && bt5 == bt8 && bt2 == "X") || (bt3 == bt6 && bt6 == bt9 && bt3 == "X")
                || (bt1 == bt5 && bt5 == bt9 && bt1 == "X") || (bt3 == bt5 && bt5 == bt7 && bt3 == "X"))) {
            return 1;
        } else if (((bt1 == bt2 && bt1 == bt3 && bt1 == "O") || (bt4 == bt5 && bt4 == bt6 && bt4 == "O")
                || (bt7 == bt8 && bt7 == bt9 && bt7 == "O") || (bt1 == bt4 && bt1 == bt7 && bt1 == "O")
                || (bt2 == bt5 && bt5 == bt8 && bt2 == "O") || (bt3 == bt6 && bt6 == bt9 && bt3 == "O")
                || (bt1 == bt5 && bt5 == bt9 && bt1 == "O") || (bt3 == bt5 && bt5 == bt7 && bt3 == "O"))) {
            return -1;
        } else if (bt1 != "" && bt2 != "" && bt3 != "" && bt4 != "" && bt5 != "" && bt6 != "" && bt7 != "" && bt8 != ""
                && bt9 != "") {
            return 0;
        }
        return 2;
    }

    public void initGame() {
        bt1.setLabel("");
        bt2.setLabel("");
        bt3.setLabel("");
        bt4.setLabel("");
        bt5.setLabel("");
        bt6.setLabel("");
        bt7.setLabel("");
        bt8.setLabel("");
        bt9.setLabel("");
    }

    public static void main(String[] args) {
        TicMain tm = new TicMain();
        tm.launchFrame();

    }

PS：那个注释部分是第一种实现，没有把它融入整个游戏中；
PPS：没有注释真是不好意思；
PPPS：INTELLJ真是意外好用，貌似eclipse不能在ActionListener里头设断点，但IntellJ可以，而且Debug时顺手多了。