public class ArrayListDemo02 {
    public static void main(String[] args) {
        //創(chuàng)建集合
        ArrayList<String> array = new ArrayList<String>();
 
        //添加元素
        array.add("hello");
        array.add("world");
        array.add("java");
 
        //public boolean remove(Object o)：刪除指定的元素，返回刪除是否成功
        System.out.println(array.remove("world"));
        System.out.println(array.remove("javaee"));
 
        //public E remove(int index)：刪除指定索引處的元素，返回被刪除的元素
        System.out.println(array.remove(1));
        //IndexOutOfBoundsException
        System.out.println(array.remove(3));
 
        //public E set(int index,E element)：修改指定索引處的元素，返回被修改的元素
        System.out.println(array.set(1,"javaee"));
        //IndexOutOfBoundsException
        System.out.println(array.set(3,"javaee"));
 
        //public E get(int index)：返回指定索引處的元素
        System.out.println(array.get(0));
        System.out.println(array.get(1));
        System.out.println(array.get(2));
 
        //public int size()：返回集合中的元素的個(gè)數(shù)
        System.out.println(array.size());
 
        //輸出集合
        System.out.println("array:" + array);
    }
}

public class ArrayListTest01 {
    public static void main(String[] args) {
        //創(chuàng)建集合對(duì)象
        ArrayList<String> array = new ArrayList<String>();
        //往集合中添加字符串對(duì)象
        array.add("張三");
        array.add("李四");
        array.add("王五");
        //遍歷集合，其次要能夠獲取到集合的長(zhǎng)度，這個(gè)通過(guò)size()方法實(shí)現(xiàn)
        System.out.println(array.size());
        //遍歷集合的通用格式
        for(int i=0; i<array.size(); i++) {
            String s = array.get(i);
            System.out.println(s);
        }
    }
}

public class ArrayListTest02 {
    public static void main(String[] args) {
        //創(chuàng)建集合對(duì)象
        ArrayList<Student> array = new ArrayList<>();
        //創(chuàng)建學(xué)生對(duì)象
        Student s1 = new Student("張三", 30);
        Student s2 = new Student("李四", 33);
        Student s3 = new Student("王五", 28);
        //添加學(xué)生對(duì)象到集合中
        array.add(s1);
        array.add(s2);
        array.add(s3);
        //遍歷集合，采用通用遍歷格式實(shí)現(xiàn)
        for (int i = 0; i < array.size(); i++) {
            Student s = array.get(i);
            System.out.println(s.getName() + "," + s.getAge());
        }
    }

public class ArrayListTest {
    public static void main(String[] args) {
        //創(chuàng)建集合對(duì)象
        ArrayList<Student> array = new ArrayList<Student>();
        //為了提高代碼的復(fù)用性，我們用方法來(lái)改進(jìn)程序
        addStudent(array);
        addStudent(array);
        addStudent(array);
        //遍歷集合，采用通用遍歷格式實(shí)現(xiàn)
        for (int i = 0; i < array.size(); i++) {
            Student s = array.get(i);
            System.out.println(s.getName() + "," + s.getAge());
        }
    }
    /*
        兩個(gè)明確：
            返回值類(lèi)型：void
            參數(shù)：ArrayList<Student> array
     */
    public static void addStudent(ArrayList<Student> array) {
        //鍵盤(pán)錄入學(xué)生對(duì)象所需要的數(shù)據(jù)
        Scanner sc = new Scanner(System.in);
        System.out.println("請(qǐng)輸入學(xué)生姓名:");
        String name = sc.nextLine();
        System.out.println("請(qǐng)輸入學(xué)生年齡:");
        String age = sc.nextLine();
        //創(chuàng)建學(xué)生對(duì)象，把鍵盤(pán)錄入的數(shù)據(jù)賦值給學(xué)生對(duì)象的成員變量
        Student s = new Student();
        s.setName(name);
        s.setAge(age);
        //往集合中添加學(xué)生對(duì)象
        array.add(s);
    }
}