//file package test; class Base { @Override public int hashCode() { return super.hashCode(); } @Override public boolean equals(Object o) { return super.equals(o); } @Override public String toString() { return super.toString(); } } class Child extends Base { @Override public int hashCode() { return super.hashCode(); } @Override public boolean equals(Object o) { return super.equals(o); } @Override public String toString() { return super.toString(); } }