首先我要解决的是文件解析的问题：

import java.io.BufferedReader; import java.io.FileNotFoundException; import java.io.FileReader; import java.io.IOException; import java.util.ArrayList; import java.util.Arrays; public class forth { public static void main(String[] args) { ArrayList<Person> list=new ArrayList<Person>(); try { FileReader fr=new FileReader("c:\\data.txt"); BufferedReader br=new BufferedReader(fr); String str=null; int num=0; int score=0; int weight=0; int i=0; while((str=br.readLine())!=null) { i++; if(i%5==2) { str=str.trim().substring(4,str.length()-5); num=Integer.parseInt(str); str=br.readLine().trim(); str=str.substring(4,str.length()-5); score=Integer.parseInt(str); i++; str=br.readLine().trim(); str=str.substring(4,str.length()-5); weight=Integer.parseInt(str); i++; Person p=new Person(num,score,weight); list.add(p); } else continue; } } catch (FileNotFoundException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } Person[] plist=new Person[list.size()]; list.toArray(plist); Arrays.sort(plist); for(int i=0;i<plist.length;i++) { System.out.print(plist[i].getNum()+". " +plist[i].getScore()+" "+plist[i].getWeight()+"\n\r"); } } } class Person implements Comparable<Person>{ private int num; private int weight; private int score; public Person(int num,int score,int weight){ this.num=num; this.score=score; this.weight=weight; } @Override public int compareTo(Person other) { if(this.score>other.score)return -1; else if(this.score<other.score) return 1; else return this.weight>other.weight?1:-1; } public int getNum() { return num; } public void setNum(int num) { this.num = num; } public int getWeight() { return weight; } public void setWeight(int weight) { this.weight = weight; } public int getScore() { return score; } public void setScore(int score) { this.score = score; } }

<p> <no>1</no> <lw>140</lw> <bw>54</bw> </p> <p> <no>2</no> <lw>155</lw> <bw>53</bw> </p> <p> <no>3</no> <lw>140</lw> <bw>42</bw> </p> <p> <no>4</no> <lw>140</lw> <bw>55</bw> </p> <p> <no>5</no> <lw>130</lw> <bw>46</bw> </p>

整体代码：

一次举重竞赛的比赛规则是：选手的成绩以成功举起的总重量来排序，举起总重量多的排在前面；当举起总重量相同时，按照体重来排序，体重轻的排在前面；要求程序读取数据文件作为输入，并按照上述规则排序后，打印出选手编号；数据文件说明如下：现有5名选手，其选手编号、成功举起的总重量及其体重如数据文件data4.txt，样例内容为：

如何把文件内容解析成想要的数据：即提取出每个选手的编号，成绩和体重