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Is default mandatory in switch case Java?
The value for a case must be of the same data type as the variable in the switch. The default statement is optional and can appear anywhere inside the switch block. In case, if it is not at the end, then a break statement must be kept after the default statement to omit the execution of the next case statement.
What is the purpose of default in switch case?
A switch statement can have an optional default case, which must appear at the end of the switch. The default case can be used for performing a task when none of the cases is true. No break is needed in the default case.
What will happen if break is not written for a case in switch case?
If we do not use break statement at the end of each case, program will execute all consecutive case statements until it finds next break statement or till the end of switch case block.
When to use default case in switch statement?
If there is no default case in a switch statement, the behavior can be unpredictable if that case arises at some point of time, which was not predictable at development stage. It is a good practice to include a default case.
Is there a default clause in Java switch statement?
Atleast it is not mandatory in Java. According to JLS, it says atmost one default case can be present. Which means no default case is acceptable . It at times also depends on the context that you are using the switch statement.
Why do we need to handle the default case?
Letting the compiler detect uncovered cases is that it largely eliminates the need for that unreachable default case that inspired your question in the first place. I was just talking with a co-worker about this this morning as well — it’s really unfortunate, but I think handling the default is required for safety, for two reasons:
Is the default condition always the last case?
The default condition can be anyplace within the switch that a case clause can exist. It is not required to be the last clause. I have seen code that put the default as the first clause. The case 2: gets executed normally, even though the default clause is above it.