public class Demo3_Collection {

	/**
	 * * A:集合的遍歷
			* 其實就是依次獲取集合中的每一個元素。
		* B:案例演示
			* 把集合轉成陣列，可以實現集合的遍歷
			* toArray()
	 */
	public static void main(String[] args) {
		//demo1();
		Collection c = new ArrayList();
		c.add(new Student("張三", 23));				//Object obj = new Student("張三",23);
		c.add(new Student("李四", 24));
		c.add(new Student("王五", 25));
		c.add(new Student("趙六", 26));
		
		Object[] arr = c.toArray();					//將集合轉換成陣列
		for (int i = 0; i < arr.length; i++) {
			//System.out.println(arr[i]);
			Student s = (Student)arr[i];			//向下轉型
			System.out.println(s.getName() + "..." + s.getAge());
		}
	}

	public static void demo1() {
		Collection c = new ArrayList();
		c.add("a");
		c.add("b");
		c.add("c");
		c.add("d");
		
		Object[] arr = c.toArray();						//將集合轉換成陣列
		for(int i = 0; i < arr.length; i++) {
			System.out.println(arr[i]);
		}
	}

}