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bullshit-codes
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IntegerEqual.java
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IntegerEqual.java
IntegerEqual.java 1.08 KB
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FunGa authored 2019年06月03日 14:43 +08:00 . 骚年,包装类用==比较大小,确定逻辑不会跑偏吗?
/*
*
* 很多人习惯在Bean中将整数类型定义为包装类,比如int的定义为了Integer,为了方便在使用Mybatis插入的时候做判断,是否为null。
* 但是,包装类等于比较的时候使用==,这样难道不怕逻辑跑偏吗?
* 如下代码,==两边都是Integer类型,想想,这会不会出bug?
*/
if(processBjd.getBusinessType() == ErpProcessBjd.BUSINESS_TYPE_PROJECT_ROY || processBjd.getBusinessType() == ErpProcessBjd.BUSINESS_TYPE_PROJECT_PROCESS){
// TODO
}
/*
*我们都知道包装类的相等比较尽量使用equals而非==。
* 在包装类中其实是重写了equals方法,比较的是值大写,
* 但是,==是比较地址,其实即使比较值,其中也有一些小坑,
* 看看下面的代码,你觉得结果会是什么?
*/
public class IntegerEqual{
public static void main(String[] args) {
Integer a = 100;
Integer b = 100;
System.out.println("a == b => "+(a == b));
Integer c = 3000;
Integer d = 3000;
System.out.println("c == d => "+(c == d));
}
}
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