Java Programming Concepts

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Questions and Answers

Which of the following terms refers to the original class in inheritance?

  • Derived
  • Subclass
  • Parent (correct)
  • Child

A derived class cannot inherit properties of a superclass.

False (B)

What type of relationship does proper inheritance create?

Is-A

An abstract method is a method that is declared without a ______.

<p>body</p> Signup and view all the answers

Match the following sorting strategies with their descriptions:

<p>Selection Sort = Find the smallest value repeatedly and place it in the correct position Insertion Sort = Build a sorted list by inserting elements into their correct position Bubble Sort = Repeatedly swap adjacent elements if they are in the wrong order</p> Signup and view all the answers

What does the compareTo method return if input1 is equal to input2?

<p>0 (D)</p> Signup and view all the answers

Polymorphism allows a single method to have multiple implementations.

<p>True (A)</p> Signup and view all the answers

What is an abstract class?

<p>It represents general concepts that derived classes have in common.</p> Signup and view all the answers

The compareTo method compares two inputs and returns a value, which can be ______, 0, or +.

<p>negative</p> Signup and view all the answers

What is the primary purpose of a search pool?

<p>To store a group of items for searching (B)</p> Signup and view all the answers

Which of the following scenarios could cause an exception to be thrown?

<p>All of the above (D)</p> Signup and view all the answers

The call stack trace provides the method, file, and line number where the exception occurred.

<p>True (A)</p> Signup and view all the answers

What is the purpose of a try-catch statement?

<p>To test a block of code for errors and define a response if an error occurs.</p> Signup and view all the answers

An exception is first thrown from the top of the call stack and, if not caught, it drops down to the ______ method.

<p>previous</p> Signup and view all the answers

Match the following standard I/O streams with their descriptions:

<p>System.out = Represents the console window for output System.in = Represents the keyboard input System.err = Represents the console window for error output</p> Signup and view all the answers

What is the condition that terminates the recursive processing known as?

<p>Base case (C)</p> Signup and view all the answers

If there is no base case in recursion, it results in infinite recursion.

<p>True (A)</p> Signup and view all the answers

Describe the difference between direct recursion and indirect recursion.

<p>Direct recursion invokes itself, while indirect recursion involves a different method calling the recursive method.</p> Signup and view all the answers

Each call to a recursive method creates a new ______ in which to work.

<p>environment</p> Signup and view all the answers

Which reserved word allows us to handle exceptions?

<p>throw (B)</p> Signup and view all the answers

What operation does a stack use to add an item?

<p>Push (C)</p> Signup and view all the answers

In a queue, the first item added is the first item removed.

<p>True (A)</p> Signup and view all the answers

What is the key advantage of using a linked list over an array?

<p>Dynamic size</p> Signup and view all the answers

The last element added to a stack is the first to be removed, following the ______ policy.

<p>LIFO</p> Signup and view all the answers

Match the following data structures with their characteristics:

<p>Stack = LIFO structure Queue = FIFO structure Linked List = Dynamic size Array = Fixed size</p> Signup and view all the answers

Which of the following best describes a linked list?

<p>A collection of nodes arranged in a linear order (A)</p> Signup and view all the answers

Stable sorting guarantees that elements with the same value remain in the same order in the output.

<p>True (A)</p> Signup and view all the answers

What are the two primary functions used to maintain a stack?

<p>Push and Pop</p> Signup and view all the answers

A ________ is a data structure where each element points to its successor.

<p>linked list</p> Signup and view all the answers

Which of the following data structures can be implemented using references?

<p>Stack (C), Tree (D)</p> Signup and view all the answers

What is the primary policy for a queue?

<p>First in First Out (FIFO) (D)</p> Signup and view all the answers

The Enqueue operation removes items from the front of the queue.

<p>False (B)</p> Signup and view all the answers

What do the head and tail of a queue represent?

<p>The head keeps track of the index of the first element, and the tail keeps track of the index for the next insertion.</p> Signup and view all the answers

In a binary tree, each node can have no more than ____ child nodes.

<p>two</p> Signup and view all the answers

Which of the following methods is used to add a new entry to a map?

<p>.put() (B)</p> Signup and view all the answers

A directed graph does not have a defined root.

<p>True (A)</p> Signup and view all the answers

What is a lambda function?

<p>A short block of code that takes in parameters and returns a value.</p> Signup and view all the answers

A ____ is a data collection that establishes a relationship between keys and values.

<p>map</p> Signup and view all the answers

What is a TreeMap?

<p>A map that stores its entries in a sorted tree structure. (C)</p> Signup and view all the answers

Flashcards

Inheritance

A fundamental object-oriented design technique used to create and organize reusable classes. It allows a new class to inherit properties and methods from an existing class.

Parent Class

The class that provides the properties and methods for a derived class.

Child Class

The class that inherits properties and methods from a parent class.

Is-A Relationship

A relationship where a derived class is a specialized version of the base class.

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Transitive Inheritance

Means that a subclass inherits properties and methods not only from its direct parent class but also from all the parent classes in the inheritance hierarchy.

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Abstract Method

A method declared without a body. It defines the method's signature but leaves the implementation to derived classes.

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Abstract Class

A class that cannot be instantiated directly. It provides a common structure for derived classes to inherit from.

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Polymorphism

Allows different objects to respond to the same message in different ways, based on their own specific implementations.

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Sorting

The process of arranging a list of items in a particular order. It involves comparing elements and swapping them to their correct positions.

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compareTo Method

A comparison method used to determine the relative order of two objects. It returns a negative value if the first object is less than the second, zero if they are equal, and a positive value if the first object is greater than the second.

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Exception

A situation that occurs during program execution that disrupts the normal flow of the program.

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Call Stack Trace

A list of method calls that led to the exception, showing the order of execution.

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Try-Catch Statement

It allows you to handle potential errors in your code gracefully without crashing the program. It defines different code blocks for 'try' (attempting execution) and 'catch' (handling exceptions).

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Exception Propagation

The process where an exception, thrown by a method higher in the call stack, travels down the stack until it's caught or the program terminates.

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Throwable Class

A class that represents any object that can be thrown as an exception.

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System.in

The standard input stream that represents the keyboard.

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System.out

The standard output stream that represents the console window.

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System.err

The standard error stream, which represents the console window, used to display error messages.

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Recursion

The process of defining something in terms of itself. It involves breaking down a problem into smaller subproblems until a base case is reached.

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Base Case

The condition that stops the recursive process, allowing the method calls to return to their origin.

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Collection

A data structure that stores elements in a specific order, allowing for insertion, deletion, and retrieval of elements.

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Stable Sorting

A sorting algorithm where elements with the same value appear in the output array in the same order as they were in the input array.

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Unstable Sorting

A sorting algorithm where the order of elements with the same value may change during the sorting process.

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Abstract Data Type (ADT)

A collection of data and the operations that can be performed on that data.

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Static Data Structure

A data structure that has a fixed, predetermined size.

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Dynamic Data Structure

A data structure that can dynamically grow or shrink in size as needed.

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Reference (Pointer)

A reference used to connect objects in a dynamic data structure, allowing them to be linked together.

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Linked List

A linear data structure where elements are linked together in a sequential manner. Each element has a value and a pointer to the next element.

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Stack

A dynamic data structure that follows the LIFO (Last In First Out) principle.

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Queue

A dynamic data structure that follows the FIFO (First In First Out) principle.

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Graph

A non-linear data structure that uses nodes and edges to represent relationships.

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Directed Graph

A type of graph where the connections are one-directional.

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Undirected Graph

A type of graph where the connections are two-directional.

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Map

A data structure that stores key-value pairs, allowing efficient retrieval of values based on their keys.

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TreeMap

A map implementation using a tree structure to organize the keys.

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HashMap

A map implementation using a hash table to store key-value pairs.

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Lambda Function

A concise way to define anonymous functions in a single line of code. Useful for processing data in collections like lists, trees, and maps.

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Study Notes

CSIT-112 Final Study Guide

  • This final exam will cover the entire course, emphasizing the second half.
  • Familiarize yourself with all concepts in the guide.

Lecture 1

  • Inheritance: A fundamental object-oriented design technique for creating and organizing reusable classes.
  • Original Class References: Parent, Super, Base
  • Derived Class References: Child, Subclass
  • Inheritance Relationship: Is-A

Lecture 2

  • Transitive Inheritance: A subclass inherits properties from the top-level class.
  • Abstract Method: A method declared without implementation (method header only).
  • Abstract Class: Represents general concepts shared by derived classes.

Lecture 4

  • Polymorphism: Allows defining a single interface with multiple implementations.
  • Polymorphic Reference Behavior: A method called through a polymorphic reference might behave differently depending on the object.

Lecture 5

  • Sorting: Arranging items in a specific order.
  • Selection Sort Strategy:
    • Find the smallest value.
    • Swap with the first element.
    • Find the next smallest value.
    • Swap with the second element.
    • Repeat until all elements are in their correct positions.

Lecture 6

  • compareTo Method: Compares two inputs and returns a value.
    • Negative value if input1 < input2
    • Zero if input1 = input2
    • Positive value if input1 > input2
  • Insertion Sort Strategy: Insert each element into its correct position in the sorted portion of the array.

Lecture 7

  • Search Pool: A group of items.

Lecture 8

  • Exception: A problem or unusual situation arising during program execution.
  • Exception Scenarios: Dividing by zero, attempting to read a non-existent file, array index out of bounds, etc.
  • Call Stack Trace: Shows the sequence of method calls leading up to the exception.
  • Includes: the method, file, and line number where the exception originated.

Lecture 9

  • Try-Catch Statement: Allows testing code blocks for errors, handling potential issues.
  • Exception Propagation: Handles exceptions not caught by the immediate method by passing them up the call stack.

Lecture 10

  • Standard I/O Streams: System.out, System.in, System.err.
    • System.out: Console output.
    • System.in: Keyboard input.
    • System.err: Error output.

Lecture 11

  • Recursion: Defining something in terms of itself.
  • Base Case: A condition that halts the recursive process.
  • Recursive Techniques Examples: Problems covered so far.

Lecture 12

  • Direct Recursion: A method calls itself directly.
  • Indirect Recursion: A method calls another method, which then calls the original method.
  • Example Recursive Functions: sum, factorial.

Lecture 13

  • Collection: An object that stores other objects.
  • Stable Sorting: Maintains the relative order of elements with equal values.
  • Unstable Sorting: Does not guarantee the relative order of equal elements.
  • Abstract Data Type (ADT): A collection of data and operations.
  • Static Data Structure: Fixed size.
  • Dynamic Data Structure: Resizable.
  • References/Pointers: Dynamic linking between objects.
  • Data Structures: Trees, Linked Lists, Graphs.

Lecture 14

  • Stack: A linear data structure following LIFO (Last-In, First-Out) principle.
  • Stack Operations: Push, Pop, Top.
  • Stack Representation: Visual Representation

Lecture 15

  • Non-Linear Data Structures: Trees, Graphs.
  • Tree Characteristics: Nodes, edges, root, parent, children, key, height.
  • Binary Tree: Each node has a maximum of two children.
  • Leaf Node: A node with no children.

Lecture 16

  • Maps: Collections that store key-value pairs.
  • Efficiency in Maps: Efficient for finding values given a key.
  • Map Implementations: TreeMap, HashMap.
  • Key-value Pairs: Examples.
  • Methods (HashMap): put, get.
  • Lambda Expressions: Used for concise, functional-style programming.
  • Lambda Limitations: Cannot contain variables, assignments, or statements (if or for loops).

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