IO操作练习

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/* * 程序头部注释开始   * 程序的版权和版本声明部分   * Copyright (c) 2011, 烟台大学计算机学院学生   * All rights reserved.   * 文件名称:流操作练习                       * 作    者:薛广晨                               * 完成日期:2012  年 11 月  10  日   * 版 本号:x1.0               * 对任务及求解方法的描述部分   * 输入描述:  * 问题描述: 有五个学生,每个学生有3门课的成绩,从键盘输入以上数据(包括姓名,三门课成绩),输入的格式:如:zhagnsan,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。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,通过获取键盘录入一行数据,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。因为要对学生的总分排序。所以可以使用TreeSet。3,将集合的信息写入到一个文件中。* 程序输出:   * 程序头部的注释结束 *///Student类class Student implements Comparable<Student>{private String name;private int math;private int chinese;private int english;private int sum;Student(String name, int math, int english, int chinese){this.name = name;this.math = math;this.chinese = chinese;this.english = english;sum = math + english + chinese;}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 this.name;}public int getMath(){return this.math;}public int getEnglish(){return this.english;}public int getChinese(){return this.chinese;}public int getSum(){return this.sum;}public int hashCode(){return this.name.hashCode() + this.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 + ", " + math + ", " + chinese + ", " + english + "]"; }}//StudentInfoTool类import java.io.*;import java.util.*;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 = null;if(cmp == null)stus = new TreeSet<Student>();else stus = new TreeSet<Student>(cmp);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();}}//StudentInfoTest类import java.util.*;import java.io.*;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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