Java Chapter 11 Questions and Answers Graded A+

Java Chapter 11 Questions and Answers Graded A+ What is the primary purpose of the Java Collections Framework? To provide a set of interfaces and classes for handling groups of objects efficiently. How does an ArrayList differ from an array in Java? An ArrayList is dynamically resizable, while an array has a fixed size. What is the key difference between HashSet and TreeSet in Java? HashSet does not maintain order, while TreeSet maintains elements in sorted order. What method is used to check if a HashMap contains a specific key? The `containsKey()` method. Which interface in the Java Collections Framework represents a resizable array? The `List` interface. 2 How does a LinkedList differ from an ArrayList? A LinkedList provides better performance for insertions and deletions, while an ArrayList is faster for random access. What does the `Map` interface in Java represent? A collection of key-value pairs where each key is unique. How can you iterate over a HashMap in Java? By using an iterator, a for-each loop on `entrySet()`, or a lambda expression with `forEach()`. What is the main purpose of the `Comparator` interface in Java? To define custom sorting logic for objects. How does a PriorityQueue order its elements? It orders elements based on their natural ordering or a provided comparator. Which collection class allows duplicate elements but maintains insertion order? 3 The `ArrayList` class. What is the purpose of the `C()` method? To sort a list of elements in ascending order using natural ordering. How do you synchronize a collection in Java? By using `CronizedList()`, `CronizedSet()`, or `CronizedMap()`.