Java instanceof 和 byte[]
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Java instanceof and byte[]
提问by Joseph Weissman
What I would expect is that 'potentialByteArray instanceof byte[]would return true when potentialByteArrayis an instance of a byte[], but this doesn't seem to happen -- it's always false for some reason!
我期望的是 'potentialByteArray instanceof byte[]会在potentialByteArray是 a 的实例时返回 true byte[]，但这似乎不会发生 - 由于某种原因它总是错误的！
I've got a conditional that looks like the following:
我有一个如下所示的条件：
if (!(potentialByteArray instanceof byte[])) { /* ... process ... */ }
else {
log.warn("--- can only encode 'byte[]' message data (got {})", msg.getClass().getSimpleName());
/* ... handle error gracefully ... */
}
...and what this outputs is the following:
...这输出的是以下内容：
--- can only encode 'byte[]' message data (got byte[])
Which means that the object actually wasa byte[]but wasn't an instanceof byte[]somehow. So... would this work for Byte[]instead or something? What's really going on here, and why isn't this working as I am expecting?
这意味着该对象实际上是一个byte[]但不是instanceof byte[]不知何故。所以......这会起作用Byte[]吗？这里到底发生了什么，为什么这不像我期望的那样工作？
What's an appropriate idiom to use here instead?
在这里使用什么合适的成语？
回答by Bala R
It looks like you have a !(not) that you don't need
看起来你有一个!你不需要的（不是）
if (!(potentialByteArray instanceof byte[])) {...}
should be
应该
if (potentialByteArray instanceof byte[]) {...}
