Do long type names impact on performance?

Question

Type name like com.example.Dog will be compiled to com/example/Dog in the .class file. How will most JVM optimize it? It seems longer type names (or member names) need more string compares.

Answer 1

Long type (class and interface) names take up room in the symbol tables. The names are used at linking time as described in detail in Chapter 5 of the Java Virtual Machine Specification. Once all this linking is done, the names have no effect on run-time performance unless you are using reflection.