ArrayList和Iterator的初步使用(一)

package cn.cp;
//ArrayList和Iterator的初步使用(一)
//注意：Person p = (Person) iterator.next();// 为什么取出来要转型？
//因为没有使用泛型，扔进去以后都成了Object，所以再取时转型
//
import java.util.ArrayList;
import java.util.Iterator;

class Person {
	private int age;
	private String name;

	public Person(int age, String name) {
		super();
		this.age = age;
		this.name = name;
	}

	public int getAge() {
		return age;
	}

	public void setAge(int age) {
		this.age = age;
	}

	public String getName() {
		return name;
	}

	public void setName(String name) {
		this.name = name;
	}

	@Override
	public String toString() {
		return "Person [age=" + age + ", name=" + name + "]";
	}

}

public class ArrayListTest1 {
	public static void main(String[] args) {
		ArrayList arrayList = new ArrayList();
		arrayList.add(new Person(11, "bbba"));
		arrayList.add(new Person(22, "aaaa"));
		arrayList.add(new Person(44, "uuul"));
		arrayList.add(new Person(99, "wwww"));
		arrayList.add(new Person(88, "xxxx"));
		Iterator iterator = arrayList.iterator();
		while (iterator.hasNext()) {
			Person p = (Person) iterator.next();// 为什么取出来要转型？因为没有使用泛型，扔进去以后都成了Object
			if (p.getAge() > 11) {
				System.out.println(p.toString());
			}
		}
		System.out.println("^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^");
		for(int x=0;x<arrayList.size();x++){//输出了ArrayList的每个对象的信息，实际是调用了toString
			System.out.println(arrayList.get(x));
		}
	}
}