Can an abstract class have a final concrete method?

Yes. An abstract class can have the final concrete method. See the below example.

public class AbstractClassFinalConcreteMethod {

	public static void main(String[] args) {
		Parent p = new Child();
		p.parentMethod();
	}
}

abstract class Parent {
	
	final void parentMethod() {
		System.out.println("Final Method in a abstract class");
	}
}

class Child extends Parent {
	
}

Output:
Final Method in a abstract class

In the above example, the parent abstract class has a final concrete method 'parentMethod' which is allowed and also called directly from the parent reference.

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