把集合转成数组，可以实现集合的遍历
toArray() *
Collection coll = new ArrayList();
coll.add(new Student("张三",23));     //Object obj = new Student("张三",23);
coll.add(new Student("李四",24));
coll.add(new Student("王五",25));
coll.add(new Student("赵六",26));

Object[] arr = coll.toArray();              //将集合转换成数组
for (int i = 0; i < arr.length; i++) {
    Student s = (Student)arr[i];            //强转成Student
    System.out.println(s.getName() + "," + s.getAge());
}

把集合转成数组，可以实现集合的遍历
toArray() *
Collection coll = new ArrayList();
coll.add(new Student("张三",23));     //Object obj = new Student("张三",23);
coll.add(new Student("李四",24));
coll.add(new Student("王五",25));
coll.add(new Student("赵六",26));

Object[] arr = coll.toArray();              //将集合转换成数组
for (int i = 0; i < arr.length; i++) {
    Student s = (Student)arr[i];            //强转成Student
    System.out.println(s.getName() + "," + s.getAge());
}