Tag: inheritance

Lombok with SuperBuilder

I have a Java project that uses Lombok ( a java library that automatically plugs into the editor and build tools ) @Getter @SuperBuilder @NoArgsConstructor @AllArgsConstructor @EqualsAndHashCode(of = {…

super.a = b instead of super(b)

I’m learning the super keyword and accidentally get this, here’s an example : public class A { double a; public A (double a) { this.a = a; } } public class B …

Using Inheritance like this is right?

I’m student learning Inheritance in Java. I’m making a program (Bitcoin Mining Game). In the program, there are different kind of digger (Mining Machine): ordinary digger (this only does digging coin), overclock digger (this can dig and can overclock to dig faster) and durability recover digger (this can dig, overclock and recover durability (every digger has durability, durability drops while

Accessing objects in other class Java inheritance

In my program I have class Vehicle and class Car which inherit from Vehicle. I’ve created two Car’s objects c and c2. Now I have to make sumFuel() method in Calculate class which sums fuel used by …

Java inheritance using super keyword

I am using inheritance along with super function in my program ,but when I am extending my class it showing error message “There is no default constructor in ‘cc’. ” . This error message is coming after 1st subclass is extended and trying to make 2nd subclass. Here is the code Answer dd inherits cc, so it’ll have to call

abstraction can be done without inheritance? java

Is abstraction possible without inheritance? This is my code Please note above, how i: did not extend the class “what” from abstract class “whatever” and yet the code runs perfectly with no errors Did not declare class “what” as abstract (since it’s not declaring the other two methods disp2() and disp3()) I am very confused. Please help. Answer There is

Inheritance for builders in lombok

I was trying to use lombok for my project. I have a class A: and a class B: I am getting an error saying builder() in B cannot override builder() in A, as return type in BBuilder is not compatible with return type in ABuilder. Is there some way to do this using lombok? I do not want to write

Are static variables inherited

I have read at 1000’s of locations that Static variables are not inherited. But then how this code works fine? Parent.java Child.java This code prints “Parent”. Also read at few locations concept of data hiding. Parent.java Child.java Now the output is “Child”. So does this mean that static variables are inherited but they follow the concept of data-hiding? Answer Please

Java: how to have an array of subclass types?

Say I have a super class “Animal” and subclasses “Cat”, Dog, Bird”. Is there a way to have an array of subclass type rather than class instances with which I’ll be able to instantiate instances of each possible subclass? To simplify, I want this: How can I do that? Edit: I don’t want an array of instances of these subclasses,