用java语言实现八数码问题 广度优先搜索

分五个部分 我对他们打包了 可以互相调用
主函数部分：
eightnum.java文件：
package com.ai;
import java.awt.*;
import java.util.ArrayList;
import java.util.Collections;
import java.applet.*;
import javax.swing.*;
public class EightNum {
 int[][] current;
 int[][] target;
 private JTextField textField_18;
 private JTextField textField_17;
 private JTextField textField_16;
 private JTextField textField_15;
 private JTextField textField_14;
 private JTextField textField_13;
 private JTextField textField_12;
 private JTextField textField_11;
 private JTextField textField_10;
 private JTextField textField_9;
 private JTextField textField_8;
 private JTextField textField_7;
 private JTextField textField_6;
 private JTextField textField_5;
 private JTextField textField_4;
 private JTextField textField_3;
 private JTextField textField_2;
 private JTextField textField;
 private JFrame frame;
 public static void main(String args[]) {
  EventQueue.invokeLater(new Runnable() {
   public void run() {
    try {
     EightNum window = new EightNum();
     window.frame.setVisible(true);
    } catch (Exception e) {
     e.printStackTrace();
    }
   }
  });
 }
 /**
  * Create the application
  */
 public EightNum() {
  
  current=new int[3][3];
  target=new int[3][3];
  createContents();
  
 }
 /**
  * Initialize the contents of the frame
  */
 private void createContents() {
  
  frame = new JFrame();
  frame.getContentPane().setLayout(new BorderLayout());
  frame.setTitle("A* 解决八数码的实现");
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