来个牛人指导下。。。 - 黑马程序员技术交流社区

键盘录入学生的语文，数学，英语成绩。按照总分排序从高到下写入文本中.*/
public class Test8 {
public static void main(String[] args) throws IOException {
lur();
}
public static void lur() throws IOException{
InputStreamReader or = new InputStreamReader(System.in);
BufferedReader br = new BufferedReader(or);
TreeMap<student,Integer> hm = new TreeMap<student,Integer>();
OutputStreamWriter ow = new
OutputStreamWriter(new FileOutputStream("d://1.txt"));
BufferedWriter bw = new BufferedWriter(ow);
String st = null;
while((st=br.readLine())!=null){
if("over".equals(st)){
break;
}
else{
String[] str = st.split(",");
student su = new student(str[0],Integer.parseInt(str[1]),Integer.parseInt(str[2]),
Integer.parseInt(str[3]));
hm.put(su,su.getsum());
}
}
List<student> li = (List<student>)hm.keySet();
Collections.sort(li);
Collections.reverse(li);
for(student s : li){
String sn = new String(s+"/t"+hm.get(s));
bw.write(sn);
bw.newLine();
}
br.close();
bw.close();
}
}
class student implements Comparable<student> {
private String name;
private int math;
private int ch;
private int english;
private int sum;
student(String name,int math,int ch,int english){
this.name=name;
this.math=math;
this.ch=ch;
this.english=english;
}
public int getsum(){
return math+ch+english;
}
public int compareTo(student s){
int num = new Integer(this.sum).compareTo(s.sum);
if(num==0){
return this.name.compareTo(s.name);
}
else{
return num;
}
}
public String toString(){
return name+","+math+","+ch+","+english;
}
}

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