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Transform values with a stream

The goal is to transform an array of numbers into a comma-delimited string using functional programming. The code snippet you provided has a minor issue: String.join(",", strings[0]) is incorrect because it tries to join a single element ( strings[0] ) rather than all elements in the strings array. Here's the corrected code for the transformValues method: import java.util.Arrays; class Answer {     // Change these boolean values to control whether you see      // the expected answer and/or hints.     static boolean showExpectedResult = true;     static boolean showHints = true;     // Transform an array of numbers into a comma-delimited list     // using functional programming.     static String transformValues(int[] numbers) {         // Convert the int array to a stream of integers         // Map each integer to its String representation         // ...
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Collections Framework

 The Java Collections Framework provides a comprehensive set of interfaces, implementations, and algorithms to work with collections of objects in Java. It offers a unified architecture for representing and manipulating collections, making it easier to work with data structures in Java programs. The Collections Framework is a fundamental part of Java programming and is widely used in various applications ranging from simple data manipulation tasks to complex algorithms and data processing pipelines.  Key components of the Collections Framework: Interfaces Collection : The root interface of the Collections Framework hierarchy. Represents a group of objects, known as elements. Subinterfaces include List , Set , and Queue . List : Represents an ordered collection of elements where duplicate elements are allowed. Allows elements to be accessed and inserted by index. Implementations include ArrayList , LinkedList , and Vector . Set : Represents a collection of unique elements ...
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Inspect a collection

Calculate the cart total  import java.util.List; import java.util.concurrent.atomic.AtomicReference; public class Main {     public static void main(String[] args) {         List<Item> items = List.of(             new Item("Item1", 10.0f, 2),             new Item("Item2", 5.0f, 4),             new Item("Item3", 20.0f, 1)         );         float total = getCartTotal(items);         System.out.println("Cart Total: " + total);  // Output: Cart Total: 60.0     }     static float getCartTotal(List<Item> items) {         AtomicReference<Float> total = new AtomicReference<>(0.0f);         items.forEach(item -> {             total.updateAndGet(v -> v + item.getQuantity() * item.getPrice())...
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