/*
有一个学生,每个学生有3门课的厅局级,
从键盘输入以上数据(包括姓名,三门课成绩),
输入的格式:如:zhangsan,30,59,95计算出总万顷,
并把学生的信息和计算出的总分数高低顺序存放在喭文件“stud.txt”中。
1,描述学生对象。
2,定义一个可操作学生对象的工具类。
思想:
1,通过获致键盘录入一行数据,并将该行中的信息取出封装成学生对象。
2,因为学生有很多,那么就需要存储,使用到集合,回禀要对学生的部分排序,
所以可以使用TreeSet。
3,将集合的信息写入到一个文件中。
*/
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 hashCode()
{
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 toSring()
{
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("stnifno.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);
}
}
/*
我从键盘输入:
lsign,68,1485,65
fnewig,85,215,3221
erdgre,85,415,652
文件里面:
Student@4a5a 200
Student@4c47 208
Student@5121 224
Student@570b 242
Student@64a1 286
问题:这是什么情况????????
[img]file:///C:\Users\loc\AppData\Roaming\Tencent\Users\770965232\QQ\WinTemp\RichOle\M9V_SQ{1]WUK[I{A(`XZZLJ.jpg[/img]
[img]file:///C:\Users\loc\AppData\Roaming\Tencent\Users\770965232\QQ\WinTemp\RichOle\M9V_SQ{1]WUK[I{A(`XZZLJ.jpg[/img]
*/
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