Contoh Java Inner Class

public class Rumah {

    private class Bilik {
        public int katil = 3;
    }
    public static void main(String[] args) {
        Rumah a = new Rumah();
        a.tengokBilik();
    }

    public Rumah tengokBilik(){
        Bilik wan = new Bilik();
        System.out.println(wan.katil); // Output 3
        return this;
    }

}