本文介绍了如何确定对象引用是否为空?的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
确定对象引用变量是否为null的最佳方法是什么?
What is the best way to determine whether an object reference variable is null?
是下面的吗?
MyObject myObjVar = null; if (myObjVar == null) { // do stuff }推荐答案
是的,是的,如果您要执行任意代码,可以使用以下代码段:
Yes, you are right, the following snippet is the way to go if you want to execute arbitrary code:
MyObject myObjVar; if (myObjVar == null) { // do stuff }顺便说一句:您的代码无法像现在那样编译,因为myObjVar在初始化之前就已被访问.
BTW: Your code wouldn't compile the way it is now, because myObjVar is accessed before it is being initialized.
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如何确定对象引用是否为空?
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