[javaSE] 集合框架Map概述

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时间: 2024-12-20 14:44:12

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一、集合框架体系概述

1.为什么出现集合类?• 面向对象语言对事物的体现都是以对象的形式,所以为了方便对多个对象的操作,就对对象进行存储,集合就是存储对象最常用的一种方式.2.数组和集合类同是容器,有何不同?• 数组虽然也可以存储对象,但长度是固定的:集合长度是可变的.数组中可以存储基本数据类型,集合只能存储对象 3.集合类的特点 • 集合只用于存储对象,集合长度是可变的,集合可以存储不同类型 的对象. 4.集合容器因为内部的数据结构不同,有多种具体容器.不断的向上抽取,就形成了集合框架. =============

集合框架Map之KeySet方法的使用

package cn.itcast.map; import java.util.HashMap;import java.util.Iterator;import java.util.Map;import java.util.Set; public class MapKeySetTest { /**  * @param args  */ public static void main(String[] args) { Map<Integer, String> map=new HashMap<