Have you ever wondered how to overload “plus” operator in Groovy ? It is as easy as adding toppings to your favourite pizza. Let me explain. Let us taka a class for Pizza:<\/p>\n
<\/p>\n
[java]
\n@ToString
\nclass Pizza {
\n String name
\n List<Topping> toppings
\n double price<\/p>\n
}
\n[\/java]
\nAnd another for the Topping:
\n[java]
\n@ToString
\nclass Topping {
\n String name
\n double price
\n}
\n[\/java]
\nNow to add toppings to the favourite pizza, let us overload the plus operator in Pizza class like this:
\n[java]
\n\/\/Method with name "plus" will override the "+" operator. It will return a new pizza with the Toppings added.
\n Pizza plus(Topping topping) {
\n new Pizza(name: name, toppings: toppings + [topping], price: price + topping.price)
\n }
\n[\/java]<\/p>\n
Let us order a pizza:
\n[java]
\nPizza pizza = new Pizza(name: "Veg Extravaganza Pizza", price: 323.32, toppings: [])
\n[\/java]<\/p>\n
And our favourite toppings as well:
\n[java]
\nTopping cheeseBurst = new Topping(name: "cheese Burst", price: 80)
\nTopping extraCheese = new Topping(name: "Extra Cheese", price: 40.43)
\nTopping jalepenos = new Topping(name: "Jallepenos", price: 50.33)
\nTopping capsicum = new Topping(name: "capsicum", price: 20.32)
\n[\/java]<\/p>\n
Can’t wait to add them all:
\n[java]
\nPizza specialPizza = pizza + cheeseBurst + extraCheese + jalepenos + capsicum
\n[\/java]<\/p>\n
Let us unbox our pizza:
\n[java]
\nprintln (specialPizza)
\n\/\/OUTPUT
\n\/*<\/p>\n
Pizza(Veg Extravaganza Pizza, [Topping(cheese Burst, 80.0), Topping(Extra Cheese, 40.43), Topping(Jallepenos, 50.33), Topping(capsicum, 20.32)], 514.4)
\n*\/
\n[\/java]<\/p>\n
Isn’t it mouth watering. <\/p>\n
Hope this helps.<\/p>\n
<\/p>\n
Imran Mir
\nimran[at]intelligrape.com<\/p>\n","protected":false},"excerpt":{"rendered":"
Have you ever wondered how to overload “plus” operator in Groovy ? It is as easy as adding toppings to your favourite pizza. Let me explain. Let us taka a class for Pizza: [java] @ToString class Pizza { String name List<Topping> toppings double price } [\/java] And another for the Topping: [java] @ToString class […]<\/p>\n","protected":false},"author":6,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"iawp_total_views":21,"footnotes":""},"categories":[7],"tags":[4840,9,1092],"class_list":["post-8925","post","type-post","status-publish","format-standard","hentry","category-grails","tag-grails","tag-groovy","tag-operator-overloading"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t