java集合Collection中的两种遍历

方法一：

    Collection c=new ArrayList();           //对象    c.add(new Student("sun",23));    c.add(new Student("li",24));    c.add(new Student("wang",25));    c.add(new Student("zhao",26));    Object[] arr=c.toArray();    for (int i = 0; i < arr.length; i++) {            Student s=(Student)arr[i];          //向下转型        System.out.println(s.getName()+"--"+s.getAge());    }

方法二：

    Collection c=new ArrayList();              //int    c.add("a");    c.add("b");    c.add("c");    c.add("d");    Object[] arr=c.toArray();                  //将集合转换成数组    for (int i = 0; i < arr.length; i++) {        System.out.println(arr[i]);    }