What to remember about inheritance in Java; When to use inheritance in Java. In object-oriented programming, we can use inheritance when we know there is an “is a” relationship between a child ...

Java’s interface language feature confuses many Java newbies. Many mistakenly assume that interfaces only sidestep Java’s failure to support multiple implementation inheritance. In reality ...

If you want to extend the Expr class, you must explicitly add the permits clause. Only a library developer can add that clause. Sealed class rules. Sealed classes offer precise control over ...