hashCode() and equals()

Here's a class named BlackBox. It overrides the equals and hashCode methods.

Which restrictions for the equals method are met?

public class BlackBox {

    private final int additive;
    private int input1;
    private int input2;


    public BlackBox(int add){
        additive = add;
    }

    @Override
    public int hashCode() {
        return super.hashCode();
    }

    @Override
    public boolean equals(Object obj) {
        if (this == obj) return  false;


        if (obj == null || !(obj instanceof BlackBox)) return false;

        BlackBox that = (BlackBox) obj;

        return  additive == that.additive
                &&
                input1 == that.input1
                &&
                input2 == that.input2;
    }
}