要求:有五个学生,每个学生有3门课程的成绩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,30,40,60计算出总成绩,并把学生的信息和计算出的总分数高低顺序存放在磁盘文件"stud.txt"中。
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;
}
@Override
public String toString() {
return "Student [name=" + name + ", ma=" + ma + ", cn=" + cn + ", en=" + en + ", sum=" + sum + "]";
}
}
class StudentInfoTool{
public static Set<Student> getStudents()throws IOException{
return getStudents(null);
}
public static Set<Student> getStudents(Comparator<Student> cmp)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("C:\\Users\\lai\\Desktop\\a.txt"));
for(Student stu : stus) {
bufw.write(stu.toString()+'\t');
bufw.write(stu.getSum());
bufw.newLine();
bufw.flush();
}
bufw.close();
}
}
public class StudentInfoTest {
public static void main(String[] args)throws IOException {
Comparator<Student> cmp = Collections.reverseOrder();
Set<Student> stus = StudentInfoTool.getStudents(cmp);
StudentInfoTool.write2File(stus);
}
}
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