public class Eq {
    static class A {
        static int j = 1;
        int i;
        A(int i) {
            this.i = i;
        }

        @Override
        public int hashCode() {
            return ++j;
        }

        @Override
        public boolean equals(Object obj) {
            if (this == obj)
                return true;
            if (obj == null)
                return false;
            if (getClass() != obj.getClass())
                return false;
            A other = (A) obj;
            return i == other.i;
        }
    }

    @Test
    void  testEquals() {
        A a1 = new A(1);
        A a2 = new A(1);
        assertTrue(a1.equals(a2));
        assertTrue(Objects.equals(a1, a2));
    }
}