日期:2014-05-20  浏览次数:20738 次

帮忙解决一下问题,用java编写此程序
编写一个学生成绩管理程序。
  学生的属性包括学号、姓名、年龄等。
  每个学生要学习若干课程,
  每门课程有平时成绩、期中考试成绩、实习成绩、期末考试成绩以及总评成绩等多个成绩,
  其中平时成绩的数目不定(因为不同课程的教师布置的平时作业数不同),
  而总评成绩是其它成绩的平均值。 
  请先设计合理的对象容器类存放这些信息,然后设计程序完成以下功能:
(1)列出某个学生的所有成绩;
(2)列出某门课程每个学生的总评成绩,及所有学生总评成绩的总评分;
(3)分区段统计某门课程的学生总评成绩,例如60 分以下的学生人数、60 至70 分的学生人数等。
根据兴趣,你还可实现其它一些功能。请仔细设计和组织你的类和使用的集合类对象。


------解决方案--------------------
Java code


Student.java

package info;

import java.util.ArrayList;
import java.util.List;

public class Student {

    private int sno;
    private String name;
    private int age;

    private List<Score> scores = new ArrayList<Score>();

    public Student() {

    }

    public Student(int sno, String name, int age) {
        this.sno = sno;
        this.name = name;
        this.age = age;
    }

    public int getSno() {
        return sno;
    }

    public void setSno(int sno) {
        this.sno = sno;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }

    /**
     * 指定课程成绩是否已经存在
     * 
     * @param cno
     * @return
     * @author sunstar
     * @date 2012-7-26 下午3:03:27
     */
    public boolean isExists(int cno) {

        for (int i = scores.size() - 1; i > -1; i--) {

            if (this.scores.get(i).getCno() == cno) {
                return true;
            }
        }

        return false;
    }

    public void addScore(Score score) {
        //如果课程还没有成绩则增加,否则不添加,防止添加多次相同课程的成绩
        if (!isExists(score.getCno())) {
            this.scores.add(score);
        }
    }

    public void delScore(int cno) {

        for (int i = scores.size() - 1; i > -1; i--) {

            if (this.scores.get(i).getCno() == cno) {
                scores.remove(i);
                break;
            }
        }
    }

    @Override
    public String toString() {
        return "Student [sno=" + sno + ", name=" + name + ", age=" + age
                + ", scores=" + scores + "]";
    }

    /**
     * 显示学生 的所有学习的课程成绩
     * 
     * @author sunstar
     * @date 2012-7-26 下午2:58:20
     */
    public void showScore() {
        System.out.println("Student [sno=" + sno + ", name=" + name + ", age="
                + age + "]  的详细成绩如下:");
        for (int i = 0; i < scores.size(); i++) {
            System.out.println(scores.get(i).toString());
        }
    }

    /**
     * 根据课程ID cno获取成绩
     * 
     * @param cno
     * @return
     * @author sunstar
     * @date 2012-7-26 下午2:57:58
     */
    public Score getScore(int cno) {
        Score score = null;
        for (int i = 0; i < scores.size(); i++) {
            if (scores.get(i).getCno() == cno) {
                score = scores.get(i);
                break;
            }
        }

        return score;

    }

    /**
     * 显示指定 课程ID的成绩
     * 
     * @param cno
     * @author sunstar
     * @date 2012-7-26 下午2:57:33
     */
    public void showScore(int cno) {

        Score score = getScore(cno);

        if (score == null) {

            System.out.println("Student [sno=" + sno + ", name=" + name
                    + ", age=" + age + "]  没有学习 ID 为" + cno + "的课程.");
        } else {
            System.out.println("Student [sno=" + sno + ", name=" + name
                    + ", age=" + age + "]  的 【" + score.getCourseName()
                    + "】  成绩如下:");
            System.out.println(score.toString());
        }

    }
}



Score.java
package info;

import java.util.ArrayList;
import java.util.List;

public class Score {

    private List<Double> daily = new ArrayList<Double>() ;//日常成绩
    private double mid ;//期中
    private double practice ;//实习
    private double end ; //期末
    private int cno ;//课程号
    private String courseName ; //课程名 
    
    
    public String getCourseName() {
        return courseName;
    }


    public void setCourseName(String courseName) {
        this.courseName = courseName;
    }


    public Score(){}
    
    
    public Score(double mid, double practice, double end, int cno,String courseName) {
        this.mid = mid;
        this.practice = practice;
        this.end = end;
        this.cno = cno;
        this.courseName = courseName ;
    }
    


    public Score(List<Double> daily, double mid, double practice, double end,
            int cno, String courseName ) {
        this.daily = daily;
        this.mid = mid;
        this.practice = practice;
        this.end = end;
        this.cno = cno;
        this.courseName = courseName ;
    }

    
    

    public List<Double> getDaily() {
        return daily;
    }


    public void setDaily(List<Double> daily) {
        this.daily = daily;
    }


    public double getMid() {
        return mid;
    }


    public void setMid(double mid) {
        this.mid = mid;
    }


    public double getPractice() {
        return practice;
    }


    public void setPractice(double practice) {
        this.practice = practice;
    }


    public double getEnd() {
        return end;
    }


    public void setEnd(double end) {
        this.end = end;
    }


    public int getCno() {
        return cno;
    }


    public void setCno(int cno) {
        this.cno = cno;
    }


    /**
     * 得到日常成绩的平均值
     * @return
     * @author sunstar
     * @date 2012-7-26 下午2:11:07
     */
    public double getSumDaily(){

        double sum = 0.0 ;
        for (int i = 0; i < daily.size(); i++){
            sum += daily.get(i) ;
        }
        return sum ;
    }


    //某个课程的总评成绩
    public double getZhongPing(){
        
        double sum = this.getSumDaily() + this.mid + this.practice + this.end ;
        
        return sum /  4 ;
    }


    @Override
    public String toString() {
        return "Score [cno=" + cno + ", courseName="
                + courseName +" , daily=" + this.getSumDaily() + ", mid=" + mid + ", practice="
                + practice + ", end=" + end + "]";
    }
    
    
    
    
}


School.java

package info;

import java.util.ArrayList;
import java.util.List;

public class School {

    public  static List<Student> stuList = new ArrayList<Student>() ;  //学生
    
    
    public static void showZhongPing(int cno){
        Score score = null ;
        Student stu = null ;
        for (int i = 0; i < stuList.size(); i++) {
            stu = stuList.get(i) ;
            score = stu.getScore(cno) ;
            if (score == null){
                System.out.println(stu.getName() + " 没有学习 ID 为  " + cno + "的课程.");
            }else{
                
                System.out.println(stu.getName() + " 的 【 " + score.getCourseName() + " 】课程总评成绩为:"+  score.getZhongPing());
            }
        }
    }
    /**
     * 0-60 , 61-80, 81 -100;
     * @return
     * @author sunstar
     * @date 2012-7-26 下午2:55:47
     */
    public static int[] total(){
        int iArrs[] = new int[3] ;
        
        //.iArrs......iArrs.
        
        return iArrs ;
        
    }
    
    /**
     * @param args
     * @author sunstar
     * @date 2012-7-26 下午2:20:05
     */
    public static void main(String[] args) {
        List<Double> daily  = null ;
        Student stu = new Student(1, "张三", 22) ;
        daily = new ArrayList<Double>() ;
        daily.add(90.5) ;
        daily.add(88.5) ;
        daily.add(85.0) ;
        daily.add(50.0) ;
        Score score = new Score(daily, 80.0, 60.0, 70.0,1, "A课程" ) ;
        stu.addScore(score) ;
        
        daily = new ArrayList<Double>() ;
        daily.add(50.5) ;
        daily.add(38.5) ;
        score = new Score(daily, 40.0, 50.0, 30.0,2, "B课程" ) ;
        stu.addScore(score) ;
        stuList.add( stu ) ;
        
        stu = new Student(2, "李斯", 22) ;
        daily = new ArrayList<Double>() ;
        daily.add(10.5) ;
        daily.add(18.5) ;
        daily.add(15.0) ;
        daily.add(10.0) ;
        score = new Score(daily, 10.0, 10.0, 10.0,1, "A课程" ) ;
        stu.addScore(score) ;
        
        daily = new ArrayList<Double>() ;
        daily.add(50.5) ;
        daily.add(38.5) ;
        score = new Score(daily, 40.0, 50.0, 30.0,2, "B课程" ) ;
        stu.addScore(score) ;
        stuList.add( stu ) ;
        stu = new Student(3, "Jone", 19) ;
        stuList.add( stu ) ;
        stu = new Student(4, "王五", 24) ;
        stuList.add( stu ) ;
        stu = new Student(5, "X六", 23) ;
        stuList.add( stu ) ;
        
        stuList.get(0).showScore() ;
        stuList.get(0).showScore(1) ;
        stuList.get(0).showScore(2) ;
        
        showZhongPing(1) ;
        
        
        

    }

}