CODEWITHSUNDEEP
javareflection
Adrian Panasiuk
Adrian Panasiuk

Reputation: 7343

Getting relative inner class name in Java

package u.v;

class x {
    static class xx {
        static class xxx { }
    }
}

While I can get the canonical ("absolute") name of the inner class

public class a{
    public static void main(String[] args) {
        System.out.println(x.xx.xxx.class.getCanonicalName());   //u.v.x.xx.xxx
    }
}

and I can also get the last component of the class name

    public static void main(String[] args) {
        System.out.println(x.xx.xxx.class.getSimpleName());   //xxx
    }

how would I go around elegantly getting a relative class name?

Utils.relativeClassName(x.xx.xxx.class, x.class);   //xx.xxx

Upvotes: 2

Views: 2593

Answers (2)

durron597
durron597

Reputation: 32323

You can use this function. The +1 is for the extra .

public static String getRelativeClassName(Class<?> inner, Class<?> outer) {
  int length = outer.getCanonicalName().length();
  return inner.getCanonicalName().substring(length+1);
}

Upvotes: 2

AlexR
AlexR

Reputation: 115328

The following string manipulation should do the job: xxx.class.getCanonicalName().substring(x.class.getCanonicalName().length + 1)

+1 is for . (dot) between the last outer class name and the name of interesting class.

Upvotes: 4

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