Inheriting properties of a class to another class

Question

I created a class named Queue, which has some operations like insert, delete, search..etc.

Now I need to create another class named PriorityQueue that inherits properties of Queue class. The new PriorityQueue class also needs a special property named priority.

How could I do it?

Answer 1

Just extend your Queue class and add the attribute

public class PriorityQueue extends Queue {
    private final String priority; //assuming it's a string 
    public PriorityQueue(String priority) {
        super(); //call parent constructor 
        this.priority = priority;
    }
}