第三题 有如下Student 对象，  private String name;       private int age;       private int score;   private String classNum;  其中，classNum&

//Student

package zuoye;

public class Student {

private String name;
private int age;
private int score;
private String classNum;
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;
}
public int getScore() {
	return score;
}
public void setScore(int score) {
	this.score = score;
}
public String getClassNum() {
	return classNum;
}
public void setClassNum(String classNum) {
	this.classNum = classNum;
}
public Student(String name, int age, int score, String classNum) {
	super();
	this.name = name;
	this.age = age;
	this.score = score;
	this.classNum = classNum;
}

}

//List

package zuoye;

import java.util.ArrayList;

import java.util.List;

public class TestStudent {

public static void main(String[] args) {

 List<Student>  list=new ArrayList();
 list.add(new Student("Tom",18,100,"class05"));
 list.add(new Student("Jerry",22,70,"class04"));
 list.add(new Student("Owen",25,90,"class04"));
 list.add(new Student("Jim",30,80,"class04"));
 list.add(new Student("Steve",28,66,"class04"));
 list.add(new Student("Kevin",24,100,"class04"));
 int sumage=0;
 int sumscore=0;
 for(Student s:list)
 {
	 sumage+=s.getAge();
	 sumscore+=s.getScore();
 }
 System.out.println("平均年龄为："+sumage/list.size());
 System.out.println("平均成绩为："+sumscore/list.size());
}

}

// 运行结果

平均年龄为：24

平均成绩为：84