/*

某中学有若干学生(学生对象放在一个List中)，每个学生都有一个姓名属性、班级名称属性(String)和考试成绩属性(int)，某次考试结束后，每个学生都获得了一个考试成绩。请打印出每个班级的总分和平均分。

*/

转自：http://www.cnblogs.com/zebbin/archive/2013/01/22/2872025.html

1 package com.study.java11; 2  3 //Student类 4 public class Student 5 { 6     private String name; //学生姓名 7     private Team team;    //学生所在班级 8     private int score;    //学生成绩 9     public Student(String name,int score)10     {11         this.setName(name);12         this.setScore(score);13     }14     public String getName()15     {16         return name;17     }18     public void setName(String name)19     {20         this.name = name;21     }22     public int getScore()23     {24         return score;25     }26     public void setScore(int score)27     {28         this.score = score;29     }30     public Team getTeam()31     {32         return team;33     }34     public void setTeam(Team team)35     {36         this.team = team;37     }38     39     public String toString() //覆写toString方法40     {41         return "\t|-姓名:"+this.name +";成绩:"+this.score;42     }43 }

1 package com.study.java11; 2  3 //Team类 4 import java.util.ArrayList; 5 import java.util.Iterator; 6 import java.util.List; 7  8  9 public class Team10 {11     private String name; //班级名称12     private List
     
       list; //学生list(一个班级里有很多学生)13     14     public Team()15     {16         this.list = new ArrayList
      
       ();17     }18     19     public Team(String name)20     {21         this();22         this.setName(name);23     }24 25     public String getName()26     {27         return name;28     }29 30     public void setName(String name)31     {32         this.name = name;33     }34 35     public List
       
         getList()36     {37         return list;38     }39 40     public void setList(List
        
          list)41     {42         this.list = list;43     }44     public String toString()45     {46         return "班级名称"+this.name;47     }48     49     public double sum()50     {51         Iterator
         
           iter =list.iterator(); 52         double sum = 0;53         while(iter.hasNext())54         {55             Student s = iter.next();56             sum += s.getScore();57         }58         59         return sum;60     }61     62     public double average()63     {64         return this.sum()/list.size();65     }66 }
         
        
       
      
     

1 package com.study.java11; 2  3 import java.util.Iterator; 4  5  6 public class TestList 7 { 8     public static void main(String[] args) 9     {10         Student s1 = new Student("张三",46);11         Student s2 = new Student("李四",98);12         Student s3 = new Student("王五",47);13         Student s4 = new Student("任六",87);14         Student s5 = new Student("黑七",45);15         Student s6 = new Student("赵四",87);16         Student s7 = new Student("孙九",95);17         Student s8 = new Student("钱七",76);18         19         Team t1 = new Team("一班");20         Team t2 = new Team("二班");21         22         t1.getList().add(s1);23         t1.getList().add(s2);24         t1.getList().add(s6);25         t1.getList().add(s8);26         27         t2.getList().add(s3);28         t2.getList().add(s4);29         t2.getList().add(s5);30         t2.getList().add(s7);31         32         s1.setTeam(t1);33         s2.setTeam(t1);34         s6.setTeam(t1);35         s8.setTeam(t1);36         37         s3.setTeam(t2);38         s4.setTeam(t2);39         s5.setTeam(t2);40         s7.setTeam(t2);41         42         System.out.println(t1);43         Iterator
     
       iter1 = t1.getList().iterator();44         while(iter1.hasNext())45         {46             Student s = iter1.next();47             System.out.println(s);48         }49         50         System.out.println("总成绩为:"+t1.sum()+",平均成绩为:"+t1.average());51         System.out.println("--------------------------------");52         53         System.out.println(t2);54         Iterator
      
        iter2 = t2.getList().iterator();55         while(iter2.hasNext())56         {57             Student s = iter2.next();58             System.out.println(s);59         }60         61         System.out.println("总成绩为:"+t2.sum()+",平均成绩为:"+t2.average());62         System.out.println("--------------------------------");63     64     }65 }