#**(综合)有如下Student 对象
其中,classNum 表示学生的班号,例如“class05”。
有如下List
List 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, “class05”));
list.add(new Student(“Jim”, 30,80 , “class05”));
list.add(new Student(“Steve”, 28, 66, “class06”));
list.add(new Student(“Kevin”, 24, 100, “class04”));
在这个list 的基础上,完成下列要求:
1) 计算所有学生的平均年龄
public class Student {
private String name;
private Integer age;
private Double score;
private String calssNum;
public Student() {
super();
// TODO 自动生成的构造函数存根
}
public Student(String name, Integer age, Double score, String calssNum) {
super();
this.name = name;
this.age = age;
this.score = score