class Test {
   void foo() {
      int i = 0;
        int j = 0;

       Inner inner = new Inner(i, j).invoke();
       j = inner.getJ();
       int k = inner.getK();
        
        int n = i+j;
        int m = k;
   }

    private class Inner {
        private int i;
        private int j;
        private int k;

        public Inner(int i, int j) {
            this.i = i;
            this.j = j;
        }

        public int getJ() {
            return j;
        }

        public int getK() {
            return k;
        }

        public Inner invoke() {
            k = i + j;
            j = 9;
            return this;
        }
    }
}