Is using the final keyword for a class sufficient to prevent inheritance from it?

The final keyword in Java indeed prevents inheritance from a class, meaning you cannot create a subclass of a class declared as final.

However, this is not always the only measure to prevent inheritance, especially when considering workarounds such as reflection or bytecode manipulation. In standard practice, final is considered sufficient protection against inheritance.

Example:

public final class MyClass {
    // class cannot be inherited
}

// Attempting to inherit will cause a compilation error
// class SubClass extends MyClass {} // error

Thus, for regular code, final is a sufficient measure, but in environments where bytecode modification or reflection is possible, it is not an absolute guarantee.