关于练习题的提问 - 黑马程序员技术交流社区

import java.io.*;
import java.util.*;
class Student implements Comparable<Student>
{
private String name;
private int ma,cn,en;
private int sum;
Student(String name,int ma,int cn,int en)
{
this.name=name;
this.ma=ma;
this.cn=cn;
this.en=en;
sum=ma+cn+en;
}
public int compareTo(Student s)
{
int num=new Integer(this.sum).compareTo(new Integer(s.sum));
if(num==0)
return this.name.compareTo(s.name);
return num;
}
public String getName()
{
return name;
}
public int getSum()
{
return sum;
}
public int haskCode()
{
return name.hashCode()+sum*78;
}
public boolean equals(Object obj)
{
if(!(obj instanceof Student))
throw new ClassCastException("类型不匹配");
Student s=(Student)obj;
return this.name.equals(s.name)&&this.sum==s.sum;
}
public String toString()
{
return "student["+name+","+ma+","+cn+","+en+"]";
}
}
class StudentInfoTool
{
public static Set<Student> getStudents() throws IOException
{
BufferedReader bufr=new BufferedReader(new InputStreamReader(System.in));
String line=null;
Set<Student> stus=new TreeSet<Student>();
while((line=bufr.readLine())!=null)
{
if("over".equals(line))
break;
String[] info=line.split(",");
Student stu=new Student(info[0],Integer.parseInt(info[1]),Integer.parseInt(info[2]),Integer.parseInt(info[3]));
stus.add(stu);
}
bufr.close();
return stus;
}
public static void write2File(Set<Student> stus) throws IOException
{
BufferedWriter bufw=new BufferedWriter(new FileWriter("stuinfo.txt"));
for(Student stu:stus)
{
bufw.write(stu.toString()+"\t");
bufw.write(stu.getSum()+"");
bufw.newLine();
bufw.flush();
}
bufw.close();
}
}
class StudentInfoTest
{
public static void main(String[] args) throws IOException
{
Set<Student>stus=StudentInfoTool.getStudents();
StudentInfoTool.write2File(stus);
}
}

复制代码