日期:2014-05-20  浏览次数:20944 次

求帮助一个读取TXT文件并排序再输出的问题
一个discs.txt中的文本内容如下
Test_Iscicles Circle-Square-Triangle Ska NoLabel 1995 2 9,12
Elvis_Presley Jailhouse_Rock Rock RCA 1991 17 72,23
Massive_Attack Protection
Massive_Attack Blue_Lines
要求是设计一个程序先从txt中读取数据到array,然后运用冒泡排序法将演唱者(如果演唱者相同则按照专辑名称)按照字母顺序a到z排序,最后再将结果输出为一个新的txt文件,要求格式和第一个music的一样,结果类似于:
Elvis_Presley Jailhouse_Rock Rock RCA 1991 17 72,23
Massive_Attack Blue_Lines
Massive_Attack Protection
Test_Iscicles Circle-Square-Triangle Ska NoLabel 1995 2 9,12
在论坛查阅相关信息,运用BufferedReader已经将TXT数据读取,代码如下:
BufferedReader bf = new BufferedReader(new InputStreamReader(new FileInputStream("d:\\discs.txt")));
  String line1 = bf.readLine();
  String[] CD1 = line1.split(" ") ;
  String line2 = bf.readLine();
  String[] CD2 = line2.split(" ");
  String line3 = bf.readLine();
  String[] CD3 = line3.split(" ") ;
  String line4 = bf.readLine();
  String[] CD4 = line4.split(" ") ;
但是到了排序这一阶段却不知道怎么写了,小弟JAVA新手,还请各位大侠指点~~

------解决方案--------------------
Java code


package com.monitor1394.test;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.logging.Level;
import java.util.logging.Logger;

/**
 *
 * @author monitor
 * Created on 2011-1-6, 23:30:52
 */
public class NameSort {

    public NameSort(){
    }

    /**
     * 从文件中获得名字列表
     * @param file 存名字的文件
     * @return 名字列表
     * @throws FileNotFoundException
     * @throws IOException
     */
    public static List<String> getNameList(String file) throws FileNotFoundException, IOException{
        List<String> nameList=new ArrayList<String>();
        BufferedReader br = new BufferedReader(new FileReader(file));
        String name=null;
        while((name=br.readLine())!=null){
            nameList.add(name);
            System.out.println(name);
        }
        if(br!=null)br.close();
        return nameList;
    }

    /**
     * 将名字写到指定文件
     * @param nameList 名字列表
     * @param file 指定文件
     * @throws IOException 文件操作异常
     */
    public static void exportNameToFile(List<String>nameList,String file) throws IOException{
        BufferedWriter bw = new BufferedWriter(new FileWriter(file));
        for(String name:nameList){
            bw.write(name);
            bw.newLine();
        }
        bw.flush();
        bw.close();
    }

    public static void main(String[] args){
        try {
            List<String> nameList = getNameList("test.txt");
            //排序
            Collections.sort(nameList);
            exportNameToFile(nameList,"name.txt");
        } catch (FileNotFoundException ex) {
            Logger.getLogger(NameSort.class.getName()).log(Level.SEVERE, null, ex);
        } catch (IOException ex) {
            Logger.getLogger(NameSort.class.getName()).log(Level.SEVERE, null, ex);
        }
    }
}

------解决方案--------------------
下面是我请两天写的名字排序的例子(统计同学的通讯方式时用的),名字排序我们一般是按拼音,但是你调用 Collections.sort(nameList);来排序汉字的话就不是那个顺序,我又给名字加了个拼音,排序的时候根据拼音来排:
Java code

package com.monitor1394.test;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

class Name implements Comparable{
    private String name;
    private String spell;

    public Name(String name,String spell){
        this.name=name;
        this.spell=spell;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getSpell() {
        return spell;
    }

    public void setSpell(String spell) {
        this.spell = spell;
    }

    public int compareTo(Object o) {
        if(o instanceof Name){
            Name n=(Name)o;
            return spell.compareTo(n.getSpell());
        }else{
           return 1;
        }
    }
}
public class Test {
    public static void main(String[] args) {
        List<Name> nameList=new ArrayList<Name>();
        nameList.add(new Name("邓永枢","dengys"));
        nameList.add(new Name("陈济民","chenjm"));
        nameList.add(new Name("方镇云","fangzy"));
        nameList.add(new Name("刘彪","liub"));
        nameList.add(new Name("叶攀","yep"));
        nameList.add(new Name("劳高津","laogj"));
        nameList.add(new Name("黄品","huangp"));
        nameList.add(new Name("黄高栋","huanghgd"));
        nameList.add(new Name("温生文","wensm"));
        //......

        Collections.sort(nameList);
        for(Name name:nameList){
            System.out.println(name.getName());
        }
    }
}