java if else 语句有两个条件
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if else statement with two condition
提问by stack overflow
This maybe trivial but I have this code
这可能微不足道，但我有这个代码
if(condition 1 & condition 2){
// apply some code
}
else{
// apply other code
}
my question is: When is else applied?
Is it applied when both conditions are falseor is it enough for one condition to be false?
我的问题是：其他什么时候应用？它是在两个条件都成立时应用false还是一个条件成立就足够了false？
回答by Blake Yarbrough
First off, you are using bitwise andwhich I don't think does what you want.
首先，您使用的是按位，我认为这不是您想要的。
In order to use logical and (&&) change if(condition 1 & condition 2){to if(condition 1 && condition 2){.
为了使用逻辑和 ( &&)if(condition 1 & condition 2){改为if(condition 1 && condition 2){.
Secondly, if one condition is falsethen the else will evaluate.
其次，如果有一个条件，false则 else 将进行评估。
When using &&in if statements the if logic evaluates if and only if both sides of the &&evaluate to true.
&&在 if 语句中使用时，if 逻辑评估当且仅当两边的&&评估结果都为真。
if evaluates when:
if 评估时间：
true && true
else evaluates when:
else 在以下情况下进行评估：
false && true
true && false
false && false
回答by JFPicard
You will need a little logic here. Check the Truth table here: https://en.wikipedia.org/wiki/Truth_table
这里你需要一点逻辑。在此处检查真值表：https: //en.wikipedia.org/wiki/Truth_table
if(condition 1 && condition 2){will enter the else if the condition of the if (condition 1 && condition 2)is false. So the condition is false if:
如果(condition 1 && condition 2){if 的条件(condition 1 && condition 2)为假，则if将进入 else 。所以条件为假，如果：
condition 1 is false OR condition 2 is false
condition 1 is false OR condition 2 is false
In that case, it's the else block that will be executed.
在这种情况下，将执行 else 块。
Also, check the difference between bitwise operators since && and & are not the same thing.
另外，检查按位运算符之间的区别，因为 && 和 & 不是一回事。
