java 当多个 Case 做同样的事情时，避免 Switch 语句冗余？
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Avoid Switch statement redundancy when multiple Cases do the same thing?
提问by Zargontapel
I have multiple cases in a switch that do the same thing, like so: (this is written in Java)
我在一个开关中有多个案例做同样的事情，就像这样：（这是用 Java 编写的）
case 1:
aMethod();
break;
case 2:
aMethod();
break;
case 3:
aMethod();
break;
case 4:
anotherMethod();
break;
Is there any way I can combine cases 1, 2 and 3 into one case, since they all call the same method?
有什么办法可以将案例 1、2 和 3 合并为一个案例，因为它们都调用相同的方法？
回答by Ted Hopp
case 1:
case 2:
case 3:
aMethod();
break;
case 4:
anotherMethod();
break;
This works because when it happens to be case 1 (for instance), it falls through to case 2 (no breakstatement), which then falls through to case 3.
这是有效的，因为当它碰巧是案例 1（例如）时，它会落入案例 2（没有break语句），然后落入案例 3。
回答by Reimeus
Sure, you can allow caseclause sections for 1 & 2 to 'fall through' to clause 3 and then breakout of the switchstatement after that:
当然，您可以允许case1 和 2 的子句部分“落入”到子句 3，然后break退出switch语句：
case 1:
case 2:
case 3:
aMethod();
break;
case 4:
anotherMethod();
break;
回答by Aravind Yarram
Below is the best you can do
下面是你能做的最好的事情
case 1:
case 2:
case 3:
aMethod();
break;
case 4:
anotherMethod();
break;
回答by Gene
It's called the "fall through" pattern:
它被称为“跌倒”模式：
case 1: // fall through
case 2: // fall through
case 3:
aMethod();
break;
case 4:
anotherMethod();
break;
