Switch Statements without Break
An error is encountered when a switch statement lacks break statements between cases. Consider the following code snippet:
switch (x) { case 0: // code case 1: // code case 2: // code }
Explanation
Java's switch statement requires break statements to separate cases. Without break, code in subsequent cases is executed even when the condition matches a previous case. In the example above, if x is 1, both cases 1 and 2 will be executed.
This behavior is typically unintended and can lead to incorrect program logic. Findbugs identifies this potential error and flags it as a warning.
Usage
Break statements are used to terminate the execution of a case and prevent code from falling through to subsequent cases. The following code is grammatically correct and will only execute the code for the matching case:
switch (foo) { case 0: doSomething(); break; case 1: doSomethingElse(); break; default: doSomeOtherThing(); break; }
Exception
In certain scenarios, it may be desirable to intentionally allow code to fall through to subsequent cases. For example,
switch (foo) { case 0: case 1: doSomething(); break; case 2: doSomethingElse(); break; default: doSomeOtherThing(); break; }
In this case, doSomething() will be executed if foo is either 0 or 1. This is a common pattern known as "fall-through" and is generally considered acceptable when no code appears between the cases (e.g., case 1 and case 2). Most analysis tools will not flag fall-through cases as errors in these situations.
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