Java for loop through list1/20/2024 ![]() ![]() I may be totally off base and if so, please use the "improve question" widget to clarify your question. How to iterate through List in Java Let’s first create a List object and add some elements to it. So, ultimately the price is cObject1 is b1.getPrice() + b1.getPrice() + b2.getPrice().Īs I said, all I have to go on is what you wrote above so this is just my best guess based off that. Iterate through List Java example shows how to iterate over a List using for loop, enhanced for loop, Iterator, ListIterator, while loop and Java 8 forEach. Java program to iterate through an ArrayList of objects using the standard for loop. Simple For loop For-each loop ListIterator While loop Java 8 Stream 1. We will use these five ways to loop through ArrayList. In your example that is: b1.getPrice() + b2.getPrice(). We can apply these iteration examples on any List, storing any type of object. ![]() In your example that would be: b1.getPrice() + cObject2.getPrice() where b1.getPrice() just returns its calculated price (the method you've already written) and cObject2.getPrice() which iterates its list of objects. Therefore, calling getPrice on cObject1 will call getPrice on each item in its list: b1 and cObject2 and return the sum of the prices. Using your example above it looks to me that cObject1 is an assembly that is composed of a B object (b1) and a C object (cObject2) which is an assembly that is composed of 2 B Objects (b1 and b2). It also looks to me that the getPrice method for a C object is a summation of the getPrice methods of each item in its list of A objects. The getPrice method for B objects appears to be fairly straight forward and in fact you've indicated that it's already been implemented. So, really C objects prices are sums of the prices of the things in their list. It also seems to me that C objects are like assemblies made up of other low level things (B objects) and possibly other assemblies (other C objects). What it looks like to me from your examples is that B objects are low level things that have a clearly defined price based off the floating point values given in the example B object constructors. When your code uses an iterator, either in this form. The List interface provides two methods to efficiently insert and remove multiple elements at an arbitrary point in the list. The main difference between Iterator and the classic for loop, apart from the obvious one of having or not having access to the index of the item youre iterating, is that using Iterator abstracts the client code from the underlying collection implementation, allow me to elaborate. I'm making a few guesses and assumptions here since you didn't include declarations or code for objects A, B, or C. How to iterate a List using for Loop in Java - The List interface extends the Collection interface and stores a sequence of elements. This is why i think it could not be a good solution The getPrice methode has no arguments, if it has an argument i could write if-else condition to check the type of each elemnt.įor this case i think that i should write my code like this:įirst i should say that i didn't write a list named objectsC form the the type C and i could not do that, because it is for the add methode problematic and it's like defining 2 seprate lists. I don't know how can i loop through a list like this.the list could Look like this : ],b2] or. I already wrote an implementation for getPrice in class B but to implement the getPrice methode for the class C, i need to loop through this list and call the getPrice() from B class. So at the end cObject1 Looks like this :] ![]() Because of that i wrote and initialized a list of type A in class C.Īnd at the end we need to define the objects of class B and C as follows: UML says that class C must have a methode add(A objectsA). In a part of this project we have an abstract class named A and A has an abstract method called getPrice(), which must be overriden by it's 2 subclasses B and C. Obj.save(Paths.get("C:\\test"), obj.I'm currently programming a school project and I have a problem in one method. Import įorEachWriteFile obj = new ForEachWriteFile() ![]()
0 Comments
Leave a Reply.AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |