public class Student {     private String name;     private int age;          public Student() {        super();    }     public Student(String name, int age){         super();         this.name = name;         this.age = age;     }    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 class Dome1 {    public static void main(String[] args) {        Collection c = new ArrayList();                Student s = new Student("张三",19);        Student s1 = new Student("李四",29);                c.add(s);        c.add(s1);        c.add(new Student("王五",18));        c.add(new Student("赵六",28));                //遍历方式1        Object[] obj = c.toArray();        for(int x=0;x