PMD tells me
A switch with less than 3 branches is inefficient, use a if statement
instead.
Why is that? Why 3? How do they define efficiency?
PMD tells me A switch with less than 3 branches is inefficient, use a
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PMD tells me
A switch with less than 3 branches is inefficient, use a if statement
instead.
Why is that? Why 3? How do they define efficiency?
Because a
switchstatement is compiled with two special JVM instructions that arelookupswitchandtableswitch. They are useful when working with a lot of cases but they cause an overhead when you have just few branches.An
if/elsestatement instead is compiled into typicaljejne… chains which are faster but require many more comparisons when used in a long chain of branches.You can see the difference by looking at byte code, in any case I wouldn’t worry about these issues, if anything could become a problem then JIT will take care of it.
Practical example:
is compiled into:
While
is compiled into