List接口的使用

import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.ListIterator;

public  class Demo01 {
    public static void main(String[] args) {
        //创建集合
        List list = new ArrayList<>();
        //1.添加数字数据(自动装箱)
        list.add(10);
        list.add(20);
        list.add(30);
        list.add(40);
        list.add(50);
        System.out.println("元素个数："+list.size());//元素个数：5
        System.out.println(list);//[10, 20, 30, 40, 50]

        //2.删除操作
        //list.remove(new Integer(10));
        list.remove(0);
        System.out.println("元素个数："+list.size());//元素个数：4
        System.out.println(list);//[20, 30, 40, 50]

        //3.补充方法subList:返回子集合，包头不包尾
        List list1 = list.subList(0, 2);
        System.out.println("元素个数："+list1.size());//元素个数：2
        System.out.println(list1);//[20, 30]

        System.out.println("===========================");

        List list2 = new ArrayList<>();
        Student s1 = new Student("张三", 11);
        Student s2 = new Student("李四", 11);
        Student s3 = new Student("王五", 11);
        //添加
        list2.add(s1);
        list2.add(s2);
        list2.add(s3);
        System.out.println("元素个数："+list2.size());//元素个数：3
        System.out.println(list2);//[Student{name='张三', age=11}, Student{name='李四', age=11}, Student{name='王五', age=11}]

        //删除
        list2.remove(s1);
        System.out.println("元素个数："+list2.size());//元素个数：2
        System.out.println(list2);//[Student{name='李四', age=11}, Student{name='王五', age=11}]

        //遍历
          //1.使用for
        for (int i = 0; i <list2.size() ; i++) {
            System.out.println(list2.get(i));
        }

          //2.使用增强for
        for (Object object:
             list2) {
            System.out.println(object);
        }

          //3.迭代器:Iterator
        Iterator iterator = list2.iterator();
        while (iterator.hasNext()){
            System.out.println(iterator.next());
        }

          //4.迭代器:ListIterator
        ListIterator listIterator = list2.listIterator();
        while (listIterator.hasNext()){
            System.out.println(listIterator.next());
        }
        //反向遍历
        while (listIterator.hasPrevious()){
            System.out.println(listIterator.previous());
        }

        //4.判断
        System.out.println(list2.contains(s2));//true
        System.out.println(list2.isEmpty());//false

        //5.获取位置
        System.out.println(list2.indexOf(s3));//1

    }
}

public class Student {
    private String name;
    private int age;

    public Student() {

    }

    public Student(String name, int age) {
        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;
    }

    @Override
    public String toString() {
        return "Student{" +
                "name='" + name + '\'' +
                ", age=" + age +
                '}';
    }
}