ripper234 ripper234 - 1 year ago 124
Java Question

Getting default value for java primitive types

I have a java primitive type at hand:

Class c = int.class; // or long.class, or boolean.class

I'd like to get a 'default value' for this class - specifically the value is assigned to fields of this type if they are not initialized. E.g., '0' for a number, 'false' for a boolean.

Is there a generic way to do this? I tried


But I'm getting an InstantiationException, and not a default instance.

Answer Source

The Guava Libraries already contains that:

Calling defaultValue will return the default value for any primitive type (as specified by the JLS), and null for any other type.

Use it like so:

Defaults.defaultValue(Integer.TYPE); //will return 0
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