集合中存储自定义对象：

package attention;

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

public class Main_7 {
	public static void main(String[] args)
	{
		Collection coll=new ArrayList();
		coll.add(new Person("List1",21));
		coll.add(new Person("List2",22));
		coll.add(new Person("List3",23));
		
		// 取出元素
		Iterator it=coll.iterator();
		while(it.hasNext())
		{
			Person p=(Person)it.next();
			System.out.println(p.getName()+":"+p.getAge());
		}
	}
}

package attention;

public class Person {

	private String name;
	private int age;
	
	// alt+shift+s  获得get、set方法
	
	public Person() {
		super();
		// TODO Auto-generated constructor stub
	}
	
		
	public Person(String name, int age) {
		super();
		this.name = name;
		this.age = age;
	}



	/**
	 * @return the name
	 */
	public String getName() {
		return name;
	}
	/**
	 * @param name the name to set
	 */
	public void setName(String name) {
		this.name = name;
	}
	/**
	 * @return the age
	 */
	public int getAge() {
		return age;
	}
	/**
	 * @param age the age to set
	 */
	public void setAge(int age) {
		this.age = age;
	}
	
	
}