集合框架-ArrayList集合存储自定义对象

package cn.itcast.p3.arraylist.test;

import java.util.ArrayList;
import java.util.Iterator;

import com.sun.org.apache.bcel.internal.generic.NEW;

import cn.itcast.p.bean.Person;
import sun.jvm.hotspot.ui.action.ShowAction;

public class ArrayListTest {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        ArrayList al = new ArrayList();
        al.add(new Person("list1",21));
        al.add(new Person("list2",22));
        al.add(new Person("list3",23));
        al.add(new Person("list4",24));
        
        
        Iterator it = al.iterator();
        while (it.hasNext()) {
            //System.out.println(((Person)it.next()).getName()+"::"+((Person) it.next()).getAge());
            //list1::22
            //list2::24 会多次调用it.next()会出错
            Person person = (Person)it.next();
            System.out.println(person.getName()+"::"+person.getAge());
        }
        
        al.add(5);//al.add(new Integer(5)) ，jdk1.5以后可以直接用因为自动装箱
        show(6);
    }

    private static void show(Integer num) {//Object num = 6 //new Integer(6) 只要觉得类型符合就装箱，当基本数据类型给引用数据类型时就是装箱
        // TODO Auto-generated method stub
        int x = num + 8;//当引用数据类型和基本数据类型作运算 拆箱
    }

}

package cn.itcast.p.bean;

public class Person {
    private String name;
    private int age;
    
    
    public Person() {
        super();
        // TODO Auto-generated constructor stub
    }
    public Person(String name, int age) {
        super();
        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;
    }
    //ctrl+alt+s 快捷构造set，get方法 初始化等
}