Let’s say this is somewhat like your Emp class. public class Emp { private String name; private int number; private int salary; public Emp( String name, int number, int salary ) { this.name = name; this.number = number; this.salary = salary; } /* some methods */ } Make another method called (for example) getSalary like … Read more
You have an upper case “I” in If (…. Change it to lower case: if (…. JavaScript is case-sensitive.
Few problems with your implementation: You are exposing both coinage and volume as writtable, meaning I can say coinage = 100000; volumne = 0; and your program will continue as if nothing was wrong. You are requiring the user to calculate volume, don’t make your user do math you can do You aren’t actually allowing … Read more
I think the following will be of some help to get started: class Dog def speak puts “woof” end end class Cat def speak puts “meow” end end class PetLover attr_accessor :species def initialize @species = [Dog, Cat] end def random_animal @species[rand(@species.size)].new end def animals(n) ary = [] n.times do ary << random_animal end ary … Read more
First of all you are not calling your class swap() function, because you are not calling it with your class object s, for class swap() function you have to call it with s. like s.swap(c,d); Further Change your function swap() name to any other name like mySwap() then you’ll get to know that this is … Read more
All objects must have keys. You define an object using curly bracers {}. Basically what you are saying is, add an array with one object that has no keys defined. If you want an array with the values a,b,c,d you can remove the bracers: myObjectList[0] = [“a”, “b”, “c”, “d”]; You always define objects with … Read more
No, both examples are not equal. In example one the variable is initialized at construction time and class1 cannot be instantiated without it. In example 2, the variable is not initialized and is given the default value of null until it is set at some later time setVar1 No, you will not get an exception. … Read more
This really is a simple one liner via map and delete or map and ES6 destructuring as shown in the 2 examples bellow: var data = [{ “first”: “Linda”, “last”: “Donson”, “salary”: “4000USD” }, { “first”: “Mark”, “last”: “Sullivan”, “salary”: “3500USD” } ] console.log(data.map(x => delete(x.salary) && x)) Also if you are concerned about mutating … Read more
Car[] can contain only Car instances, or sub-classes of Car instances. If you were to have a class like this: class Honda extends Car , Honda instances can be populated in the Car array as well, because Honda extends from Car. Object[] can contain any Object instances, or any subclass of Object (every class in … Read more
In order for this to work you need to override hashcode and equals on the contents of the list. Contains uses these methods, which by default are based on the memory reference so it will only work for a shallow copy.