import java.util.Arrays; import java.util.Objects; class I { public int hashCode() { return 0; } public boolean equals(Object o) { return o == this; } } class A extends I { int[] a1; @Override public boolean equals(Object o) { if (o == null || getClass() != o.getClass()) return false; if (!super.equals(o)) return false; final A a = (A) o; return Objects.deepEquals(a1, a.a1); } @Override public int hashCode() { return Objects.hash(super.hashCode(), Arrays.hashCode(a1)); } }