How can I make two instances of a class, update the same array from that class? Like here, I want r1 and r2 to update same pendingOrders, so that finally the array is [‘yo’, ‘lo’]. That is not happening, the r1 and r2 are making different arrays. Answer Add the static keyword to the pe…
Tag: object
How to display least and most expensive from array in Java
So I have an array of 15 Flying Objects, The flyingObjects class consists of 1 variable (Price: Double) with its getters and setters. I also have an airplane class that extends FlyingObjects, a helicopter class that extends Airplane and quadrotor and multirotor class that extends helicopter. On the other side…
Method to output object details taken from main class
i have a created a main Pet class which contains the pet name and age and 2 sub classes for a Cat and dog which contain the breed, i am trying to create a method to display the information as a string but i am not sure how to pass the arguments to the method. When trying to use the
Java alternative of javascript dynamically constructed object
I’ve been trying to build an object of some sort which allows dynamic key adding/removing, similar to javascript objects. I’m trying to do something like this in java(code below is javascript): I’ve tried doing: Although that definitely won’t work as “String cannot be converted t…
How can I override object methods inside interface?
All classes in java extend the Object class implicitly. But that doesn’t concern interfaces. Interfaces can only extend other interfaces, but no classes. However, I can override object class methods inside my interface. Can you please explain in simple words how is this even possible? Is there any use c…
Does functions occupy more memory for each instance of the same object?
Imagine this extreme situation: A class City with 10 variables, but 1000 lines of functions and logic that operates these variables. I don’t know exactly how much memory will occupy a instance of this class, but let’s say that the variables occupy 10 bytes and the 1000 lines of functions occupy 1 …
Need help to run an if statement inside an object to change that objects attributes (JAVA)
Im not extremely high level at this and this is my first time really working with objects and classes. I am trying to make a card game and want to color the card’s suit name either red or black with the Java color code things. Each card is its own object, with a suit and a number value. Heres the
Keyboard shortcut to create new instance of object in java
I was wondering is there is a keyboard shortcut (in IntelliJ) for creating a new instance of an object. e.g. when I type PersonObject personObject = new PersonObject, is there a way to type this faster? Instead of writing it out, or using autocomplete. Answer The Answer by racraman looks like a good one. An a…
Storing Objects of multiple classes in an Array List, then accessing their attributes
I have class of (sub)Objects And a class of Objects The Objects hold the values height and width and an ArrayList of SubObjects. This works as intended, I do however want to store multiple types of SubObjects from different classes in these ArrayLists. After a bit of googling I changed the Objects class to Th…
Implementing a printAnimals method
I am trying to implement a printAnimals() method that prints the ArrayList for dogs or prints the ArrayList for monkeys, or prints all animals whose training status is “in service” and whose is Not reserved, depending on the input you enter in the menu. I am trying to correctly write a for loop fo…