检查随机序列重复[Java]

呃。。。。代码编辑坏了－ －！

/*
 * @(#)Main.java
 * Author: 88250 <[email protected]>, http://blog.csdn.net/DL88250
 * Created on May 13, 2008, 4:11:44 PM
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU Library General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 */
package checkthesame;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Comparator;
import java.util.List;
import java.util.Random;
import java.util.logging.Level;
import java.util.logging.Logger;

/**
 * Check the same record in a file.
 * <p>
 * Every record in data file is a random serial, like the followings:<br>
 * // data file
 * 1902323484354370234844<br>
 * 1928473090393719374<br>
 * ....<br>
 * </p>
 * @author 88250 <[email protected]>, http://blog.csdn.net/DL88250
 */
public class Main {

    /**
     * store the data records
     */
    public static List<String> records = new ArrayList<String>();
    /**
     * statistics
     */
    public static List<List<String>> statistics = new ArrayList<List<String>>();

    /**
     * Read the records from the data file which named "data.txt" into memory,
     * using a <code>java.util.ArrayList</code> store them.
     * @see #records
     */
    public static void readRecords() {
        System.out.println("Get starting read records....");
        try {
            BufferedReader reader = new BufferedReader(
                    new FileReader("data.txt"));
            String aLine;
            while ((aLine = reader.readLine()) != null) {
                records.add(aLine);
            }
            reader.close();
        } catch (IOException ex) {
            Logger.getLogger(Main.class.getName()).log(Level.SEVERE, null, ex);
        }
        System.out.println("The amount of records: " + records.size());
    }

    /**
     * Create some records for test.
     */
    public static void createTestRecords() {
        File file = new File("data.txt");
        if (file.exists()) {
            file.delete();
        }

        try {
            BufferedWriter writer =
                    new BufferedWriter(new FileWriter("data.txt"));

            Random random = new Random();
            byte[] bytes = new byte[16];
            for (int i = 0; i < 1000000; i++) {
                StringBuffer aLine;
                random.nextBytes(bytes);
                aLine = new StringBuffer();
                for (int j = 0; j < 16; j++) {
                    aLine.append((int) bytes[j]);
                }

                // System.out.println(aLine);

                writer.write(aLine.toString());
                //System.out.println();
                writer.newLine();
            }
            writer.close();
        } catch (IOException ex) {
            Logger.getLogger(Main.class.getName()).log(Level.SEVERE, null, ex);
        }
    }

    /**
     * Main program entry.
     * @param args the command line arguments, should be <code>null</code>
     */
    public static void main(String[] args) {
        createTestRecords();
        readRecords();
        displayRecords(10);
        checkTheSame();
    }

    /**
     * Check the same data records in {@link #records}.
     */
    public static void checkTheSame() {
        sortTheRecords();   // sort them

        // displayRecords(10);
        for (int i = 0; i < records.size() - 1; i++) {
            String record1 = records.get(i);
            String record2 = records.get(i + 1);
            if (record1.equals(record2)) {
                List<String> equalities = new ArrayList<String>();
                equalities.add(record1);
                equalities.add(record2);
                statistics.add(equalities);
            }
        }
        displayStats();
    }

    /**
     * Display the data records in console.
     * @param amount display amount, start from {@link #records}'s beginning
     */
    public static void displayRecords(int amount) {
        if (amount < 0 || amount > records.size()) {
            System.out.println("The specified amount exceeds the Data records" +
                    "size!");
        }
        System.out.println("Display: ");
        for (int i = 0; i < amount; i++) {
            System.out.println(records.get(i));
        }
        System.out.println();
    }

    /**
     * Display the statistic results in console.
     */
    private static void displayStats() {
        System.out.println("Statistics: ");
        System.out.println("A amount of the same data records: " + statistics.
                size());
        for (List<String> aEqualities : statistics) {
            System.out.println(aEqualities.get(0) + " occurs " + aEqualities.
                    size());
        }
    }

    /**
     * Using {@link java.util.Collections#sort(java.util.List)} to sort the
     * data records.
     */
    @SuppressWarnings("unchecked")
    private static void sortTheRecords() {
        java.util.Collections.sort(records,
                new Comparator() {

                    @Override
                    public int compare(Object o1,
                            Object o2) {
                        String r1 =
                                (String) o1;
                        String r2 =
                                (String) o2;
                        return r1.compareTo(r2);
                    }
                });
    }
}