{"id":21974137,"url":"https://github.com/javaobjects/demo517","last_synced_at":"2025-07-16T15:40:22.823Z","repository":{"id":105562333,"uuid":"196541805","full_name":"javaobjects/demo517","owner":"javaobjects","description":"Java高级应用编程—— 集合","archived":false,"fork":false,"pushed_at":"2019-08-01T06:29:06.000Z","size":169,"stargazers_count":0,"open_issues_count":0,"forks_count":0,"subscribers_count":2,"default_branch":"master","last_synced_at":"2025-01-28T03:17:17.440Z","etag":null,"topics":[],"latest_commit_sha":null,"homepage":null,"language":"Java","has_issues":true,"has_wiki":null,"has_pages":null,"mirror_url":null,"source_name":null,"license":null,"status":null,"scm":"git","pull_requests_enabled":true,"icon_url":"https://github.com/javaobjects.png","metadata":{"files":{"readme":"README.md","changelog":null,"contributing":null,"funding":null,"license":null,"code_of_conduct":null,"threat_model":null,"audit":null,"citation":null,"codeowners":null,"security":null,"support":null,"governance":null,"roadmap":null,"authors":null,"dei":null,"publiccode":null,"codemeta":null}},"created_at":"2019-07-12T08:37:48.000Z","updated_at":"2019-08-01T06:29:08.000Z","dependencies_parsed_at":null,"dependency_job_id":"3f5d716e-7291-466c-b49e-5990bc5afdc2","html_url":"https://github.com/javaobjects/demo517","commit_stats":null,"previous_names":[],"tags_count":0,"template":false,"template_full_name":null,"repository_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/javaobjects%2Fdemo517","tags_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/javaobjects%2Fdemo517/tags","releases_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/javaobjects%2Fdemo517/releases","manifests_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/javaobjects%2Fdemo517/manifests","owner_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/owners/javaobjects","download_url":"https://codeload.github.com/javaobjects/demo517/tar.gz/refs/heads/master","host":{"name":"GitHub","url":"https://github.com","kind":"github","repositories_count":245033759,"owners_count":20550327,"icon_url":"https://github.com/github.png","version":null,"created_at":"2022-05-30T11:31:42.601Z","updated_at":"2022-07-04T15:15:14.044Z","host_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub","repositories_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories","repository_names_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repository_names","owners_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/owners"}},"keywords":[],"created_at":"2024-11-29T15:38:51.610Z","updated_at":"2025-03-22T23:25:38.420Z","avatar_url":"https://github.com/javaobjects.png","language":"Java","funding_links":[],"categories":[],"sub_categories":[],"readme":"# 123-Java-集合和数组的区别.md\n\n+ 集合概述\n    + Java中集合类是用来存放对象的\n    + 集合相当于一个容器，里面包容着一组对象  ——  容器类\n    + 其中的每个对象作为集合的一个元素出现\n    + Java API提供的集合类位于java.util包内\n+ Java中数组与集合的比较\n    + 数组也是容器，它是定长的，访问较快，但是数组不会自动扩充\n    + 数组可以包含基本数据类型或引用类型的对象，而集合中只能包含引用类型的对象\n+ Java中集合框架层次结构\n\n![](123-Images/1.png)\n\n1. 为什么要掌握集合?\n\n+ 数组有缺点：\n    + 1. 使用之前一定要先初始化，给定长度\n    + 2. 数组一旦声明，只能放一种类型的元素\n+ 集合的特点：    \n    + 1. 集合使用之前也要初始化，但是如果集合存放不下元素的话，集合会自动扩大长度;\n    + 2. 集合是一个垃圾桶，什么元素都能放;\n\n**示例代码：**\n\n```\npackage List集合;\n\nimport java.util.ArrayList;\nimport java.util.List;\n\npublic class TestCollection1 {\n\n\tpublic static void main(String[] args) {\n\t\tList list = new ArrayList(10);\n\t\tlist.add(\"abc\");\n\t\tlist.add(10);\n\t\t\n\t\tlist.add(new Object());\n\t\tlist.add(\"abc\");\n\t\tlist.add(10);\n\t\t\n\t\tlist.add(new Object());\n\t\tlist.add(\"abc\");\n\t\tlist.add(10);\n\t\t\n\t\tlist.add(new Object());\n\t\tlist.add(\"abc\");\n\t\tlist.add(10);\n\t\t\n\t\tSystem.out.println(list);\n\t}\n}\n```\n\n**以就就是我关于 *Java-集合和数组的区别*  知识点的整理与总结的全部内容，[另附源码](https://github.com/javaobjects/demo517)**\n\n==================================================================\n#### 分割线\n==================================================================\n\n**博主为咯学编程：父母不同意学编程，现已断绝关系;恋人不同意学编程，现已分手;亲戚不同意学编程，现已断绝来往;老板不同意学编程,现已失业三十年。。。。。。如果此博文有帮到你欢迎打赏，金额不限。。。**\n\n![](123-Images/pay.png)","project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fjavaobjects%2Fdemo517","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Fjavaobjects%2Fdemo517","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fjavaobjects%2Fdemo517/lists"}