javaserializationreflectionjava-mecldc

Is Object.class.getName() Slow?

I'm writing code in the Java ME environment, so speed is absolutely an important factor. I have read several places that reflection of any sort (even the very limited amounts that are allowed on java ME) can be a very large bottleneck.

So, my question is this: is doing String.class.getName() slow? What about myCustomObject.getClass().getName()? Is it better to simply replace those with string constants, like "java.lang.String" and "com.company.MyObject"?

In case you're wondering, I need the class names of all primitives (and non-primitives as well) because Java ME does not provide a default serialization implementation and thus I have to implement my own. I need a generic serialization solution that will work for both communication across the network as well as local storage (RMS, but also JSR-75)

Edit

I'm using Java 1.3 CLDC.

Solution

  • String.class.getName() would be not slow because its value will be loaded before executed.i.e compiler will put its value before line will execute. myCustomObject.getClass().getName() would be bit slower then previous as it will be retrieved at time for execution