Io排序计算学生成绩

/**
 * 有5个学生，每个学生有三门课的成绩
 * 从键盘上录入以上数据（包括姓名,三门课成绩）
 * 输入（zhang ，12,34,45）计算出总成绩
 * 并把学生的信息和计算出的成绩高低保存到磁盘stud.txt中。
 * @author Administrator
 *
 */
public class IoExercise {

 public static void main(String[] args) {
  Set<IoExerciseStudent> set = IoExerciseStudentUtil.getStudent();
  IoExerciseStudentUtil.writeStudent(set);
 }

}

 

 

//学生对象

public class IoExerciseStudent  implements Comparable<IoExerciseStudent>{
 private String name;
 private int ma,cn,en;
 private int sum;
 public IoExerciseStudent(String name, int ma, int cn, int en) {
  this.name = name;
  this.ma = ma;
  this.cn = cn;
  this.en = en;
  this.sum = ma+cn+en;
 }
 @Override
 public int compareTo(IoExerciseStudent o) {
  int in= new Integer(this.sum).compareTo(new Integer(o.sum));
  if(in == 0){
   return this.name.compareTo(o.name);
  }
  return in;
 }
 @Override
 public int hashCode() {
  final int prime = 31;
  int result = 1;
  result = prime * result + cn;
  result = prime * result + en;
  result = prime * result + ma;
  result = prime * result + ((name == null) ? 0 : name.hashCode());
  result = prime * result + sum;
  return result;
 }

 @Override
 public boolean equals(Object obj) {
  if (this == obj)
   return true;
  if (obj == null)
   return false;
  if (getClass() != obj.getClass())
   return false;
  IoExerciseStudent other = (IoExerciseStudent) obj;
  if (cn != other.cn)
   return false;
  if (en != other.en)
   return false;
  if (ma != other.ma)
   return false;
  if (name == null) {
   if (other.name != null)
    return false;
  } else if (!name.equals(other.name))
   return false;
  if (sum != other.sum)
   return false;
  return true;
 }

 @Override
 public String toString() {
  return "name=" + name + ", sum=" + sum;
 }
 
 
}

 

//调用学生方法

public class IoExerciseStudentUtil {
 public static Set<IoExerciseStudent> getStudent(){
  BufferedReader bufferedRead = new BufferedReader(new InputStreamReader(System.in));
  String str = null;
  IoExerciseStudent ioExerciseStudent;
  Set<IoExerciseStudent> set = new TreeSet<IoExerciseStudent>();
  try {
   while((str = bufferedRead.readLine()) != null){
    if("over".equals(str))break;
    String[] strs = str.split(",");
    ioExerciseStudent = new IoExerciseStudent(strs[0],Integer.parseInt(strs[1]), Integer.parseInt(strs[2]), Integer.parseInt(strs[3]));
    set.add(ioExerciseStudent);
   }
   bufferedRead.close();
   return set;
  } catch (IOException e) {
   e.printStackTrace();
  }
  return set;
 }
 public static void writeStudent(Set<IoExerciseStudent> set){
  try {
   BufferedWriter bufferedWrite = new BufferedWriter(new FileWriter("f:\\studet.txt",true));
   for(IoExerciseStudent stu : set){
    bufferedWrite.write(stu.toString());
    bufferedWrite.newLine();
    bufferedWrite.flush();
   }
   bufferedWrite.close();
  } catch (IOException e) {
   e.printStackTrace();
  }
 }
}