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Java´úÂë Êý¾ÝÍÚ¾òÖоö²ßÊ÷C4.5Ô¤²âË㷨ʵÏÖ(°ë³ÉÆ·£¬»¹ÒªÐ´¹æÔòºó¼ôÖ¦¼°¶Ô·ÇÀëÉ¢Êý¾ÝÐÅÏ¢ÔöÒæ¼ÆËã) Java´úÂë package org.struct.decisiontree;   import java.util.ArrayList;   import java.util.Arrays;   import java.util.List;   import java.util.TreeSet;   /** * @author Leon.Chen */ public class DecisionTreeBaseC4p5 {   /**      * root node      */ private DecisionTreeNode root;   /**      * visableArray      */ private boolean[] visable;   private static final int NOT_FOUND = -1;   private static final int DATA_START_LINE = 1;   private Object[] trainingArray;   private String[] columnHeaderArray;   /**      * forecast node index      */ private int nodeIndex;   /**      * @param args      */ @SuppressWarnings("boxing")   public static void main(String[] args) {           Object[] array = new Object[] {   new String[] { "age",          "income",   "student", "credit_rating", "buys_computer" },   new String[] { "youth",        "high",     "no",      "fair",          "no"  },   new String[] { "youth",        "high",     "no",      "excellent",     "no"  },   new String[] {