天气预报 > 技术 > integer和int的区别
integer和int的区别
更新时间: 2021-06-11 09:55:20  

1、Integer是int的包装类,int则是java的一种基本数据类型 ;

2、Integer变量必须实例化后才能使用,而int变量不需要;

3、Integer实际是对象的引用,当new一个Integer时,实际上是生成一个指针指向此对象;而int则是直接存储数据值;

4、Integer的默认值是null,int的默认值是0。

关键词: integer int 区别

integer和int的区别相关经验

天气预报

最新推荐

页面:/news/view-3496448/ | 耗时:0.5887 s | 内存:2.11 MB | 查询:4 | 缓存读取:3 写入:0 | 加载文件:25
select * from tbl_Articles WHERE ArticleID=3496448 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=3496448 LIMIT 0,1
select * from tbl_Articles_sphinx where id=3496448 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(2882654,3135220,2546064,1810106,3090178,1593941,2529435,3088036,1392436,1095163,1626414,1617279,1391374,2601791,1945463,1280640,2879362,3134731,439173,2965184,2794147,1465100,1679196,1087189,2664267,125854,2703131,2192364,1459347,98128) ORDER BY field (ArticleID,2882654,3135220,2546064,1810106,3090178,1593941,2529435,3088036,1392436,1095163,1626414,1617279,1391374,2601791,1945463,1280640,2879362,3134731,439173,2965184,2794147,1465100,1679196,1087189,2664267,125854,2703131,2192364,1459347,98128)