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# Defining constants as part of an interface
AIDL has been enhanced to support defining integer and string constants
as part of an interface.
## Integer constants
```
interface IMyInterface {
const int CONST_A = 1;
const int CONST_B = 2;
const int CONST_C = 3;
...
}
```
These map to appropriate 32 bit integer class constants in Java and C++ (e.g.
`IMyInterface.CONST_A` and `IMyInterface::CONST_A` respectively).
## String constants
```
interface IMyInterface {
const String CONST_A = "foo";
const String CONST_B = "bar";
...
}
```
These map to class level String constants in Java, and static getter
functions that return a const android::String16& in C++.
The constants are limited to contain printable ASCII characters < 0x10
and without backspaces (i.e. no '\' character).
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