class NaturalJoin extends JoinCriteria {

    @Override
    public boolean equals(Object obj) {<FILL_FUNCTION_BODY>}

    @Override
    public int hashCode() {
        return 0;
    }

    @Override
    public String toString() {
        return "NaturalJoin{}";
    }
}

        if (this == obj) {
            return true;
        }
        return (obj != null) && (getClass() == obj.getClass());
    
<methods>public non-sealed void <init>() ,public abstract boolean equals(java.lang.Object) ,public abstract int hashCode() ,public abstract java.lang.String toString() <variables>