You're building a library system. Books are stored in a shelf where the first book is at position 0, second at position 1, and so on. If a shelf has 10 books, what happens when someone asks for the book at position 10?

A teacher wants to check if a student's name exists in a class list of 30 students. What information do you need to access ALL student names efficiently?

A restaurant has a reservation system. If they declare String[] reservations = new String[20]; but only 15 people make reservations, what can you say about the array?

You're tracking daily temperatures for a week. You store them as int[] temps = {32, 30, 28, 35, 33, 31, 29};. How do you find out how many days of data you have WITHOUT counting manually?

A game developer stores player scores in an array. To display the third player's score, which index should they access?

You're making a contact list app. Users can add contacts, but after declaring String[] contacts = new String[100];, a user wants to add a 101st contact. What's true?

A chess board is 8x8. How would you properly declare an array to represent all squares?

You store exam scores: int[] scores = {85, 90, 78, 92, 88};. To calculate the class average, you need to add all scores and divide by what value?

A parking lot has 3 floors, each floor has 20 spots. You declare int[][] parking = new int[3][20];. To mark the 5th spot on the 2nd floor as occupied, what's the correct way?

You're storing student grades in double[] grades = new double[25];. A student asks to check their grade, and you accidentally access grades[25]. What happens?

A store inventory system tracks items in different categories. Category A has 10 items, Category B has 15 items, Category C has 8 items. What's the most efficient declaration?

You initialize String[] names = {"Ana", "Ben", "Cat"}; and later try names[1] = "Bob"; What happens?

A fitness app tracks workouts for 7 days. Each day has 3 metrics (duration, calories, distance). How many total values can be stored in int[][] fitness = new int[7][3];?

You're designing a banking system. A bank account has a balance, account number, and can perform deposits/withdrawals. What programming concept represents "performing deposits"?

A car manufacturing company needs to produce 1000 cars with the same specifications but different colors and serial numbers. What should they create FIRST?

You create a Student class with a method calculateGPA(). You want to use this method for 50 different students. What's the MAIN advantage?

A social media app has a "Like" button. Every user can like posts. The action of clicking "Like" is a method that increases a counter. What makes this method useful across millions of users?

You're creating a Calculator class. You want a method to add two numbers and give you the result. What should you replace void with if the method is: void add(int a, int b)?

A food delivery app has restaurants. Each restaurant has a name, address, rating, and can accept orders. What represents the "identity" of a restaurant?

You write a method: public void printReceipt(String item, double price). When calling this method, what are "Burger" and 5.99?

A hospital system has a Patient class. Creating a new patient record means you need to:

You create a method to check if a student passed: public boolean isPassed(int score). It should return true if score >= 75, false otherwise. What keyword must be inside this method?

A gaming company uses the same playSound() method for all sound effects. One day they fix a bug in this method. What happens?

You have a Rectangle class with length and width values. These values represent the:

A pizza ordering system has a method orderPizza(String size, String topping, int quantity). You call it as orderPizza("Large", "Pepperoni", 2);. What does String size represent?

You need to use Math.sqrt() to calculate square roots in your program. This method is:

A login system checks usernames. The method is public void checkUser(String username). Users complain they don't know if login succeeded. What's wrong?

You're building a school system with classes for Teacher, Student, and Classroom. Each class represents a:

You're building a text editor. Users type long documents that need constant editing (adding, removing, replacing text). What should you use?

An e-commerce site shows product reviews. One review says "This product is bad" and you want to change "bad" to "good". You need to replace characters at specific positions. What method does this?

A messenger app shows typing indicators by adding dots: "Typing" → "Typing." → "Typing.." → "Typing...". What StringBuilder method efficiently adds these dots?

You create: String s1 = "Java"; and String s2 = new String("Java");. What's the difference?

A password validator needs to check if a password meets requirements by examining each character. What method gets the character at a specific position?

A social media username must be unique. The system needs to reverse the username for a special display feature. If the username is stored in a StringBuilder, what method reverses it?

You're creating a URL shortener. The original URL is https://example.com/very/long/path and you only need /very/long/path. What extracts this portion?

A text message app has a character limit. Before sending, you need to count characters in the message. What method does this?

You're building a search feature. When storing millions of search queries, you want to save memory by reusing identical strings. How should you create these strings?

You created a program to calculate student grades. Teachers run it as java GradeCalc 85 90 78. What stores these three numbers?

A calculator program runs as java Calculator 15 7. You want to add these numbers, but args[0] + args[1] gives “157” instead of 22. Why?

An ATM system has a function to calculate interest. The formula never changes: same input always produces same output. What should the Deterministic property be?

You run: java Program Hello 123 World 456. What is args.length?

A company needs a custom function to calculate employee bonuses. They can't find this in Java's built-in methods. What should they create?

Your program runs as java Test 42.5. To convert this to a decimal number for calculations, what should you use?

A temperature converter accepts Celsius from command line: java TempConverter 25. Inside the program, args[0] is:

You create a function calculateTax that must process data from a database source. The function MUST execute on that source server, not locally. What pushdown option?

A function name in your program is public void 123Start(). What's wrong?

You run a quiz program: java Quiz 10 20 30 40. To access the third number, what's the correct code?