Control Flow and Loops

A developer needs to implement a menu-driven program that repeatedly displays options, reads input, and processes the choice until the user selects 'Exit'. Which loop structure and control flow is most appropriate?

Which TWO statements about the enhanced for loop (for-each) are correct?

In a Java method, a developer needs to skip the current iteration and move to the next when a certain condition is met inside a for loop. Which statement should be used?

A program needs to read user input until 'quit' is entered. Which loop ensures that the condition is evaluated after executing the body at least once?

Which two statements about the break statement in Java are true?

You are tuning a real-time data processing application that reads sensor data from a queue. The system must process each sensor reading, but occasionally a reading is invalid (null) and should be skipped. The loop must run indefinitely until the application is shut down gracefully. The current implementation uses a while(true) loop with a break condition when a shutdown flag is set. However, the loop is consuming excessive CPU because it continuously polls the queue even when no data is available. You need to modify the loop to reduce CPU usage while still processing data efficiently. Which approach should you take?

A developer writes a switch statement that checks the day of the week. The code uses fall-through to handle weekdays. What happens if a case does not end with a break?

What is the output of the following code? int i = 0; while (i < 5) { if (i == 3) { i++; continue; } System.out.print(i + " "); i++; }

Which of the following scenarios demonstrates the most appropriate use of a continue statement?

What is printed by the program? ```java for (int i = 0; i < 2; i++) { for (int j = 0; j < 3; j++) { System.out.print(i + "," + j + " "); if (i == 1) break; } } ```

Which two control flow statements can be used to terminate a loop prematurely?

Which loop is guaranteed to execute its body at least once?

int count = 0; for (int i = 0; i < 5; i++) { if (i == 2) { continue; } count++; } System.out.println(count); What is the output of the program?

A developer writes the following code: for (int i = 0; i < 5; i++) { for (int j = i; j < 5; j++) { System.out.print(j); } } How many times does the inner loop execute in total?

A developer receives a ticket that a batch processing job is running indefinitely. The job reads records from a database and processes them in a loop. The code uses a while(true) loop with a break condition when a sentinel value is encountered. However, due to a data anomaly, the sentinel value is never reached, causing the loop to run forever. The developer needs to fix the loop to prevent infinite execution while still allowing processing of all records until the sentinel is reached. Which approach is most appropriate?

Which TWO are best practices for using control flow statements? (Choose two.)

Given the code fragment: ```java int[] data = {1, 2, 3, 4, 5}; int sum = 0; for (int i = 0; i <= data.length; i++) { sum += data[i]; } System.out.println(sum); ``` What is the result?

A programmer writes a switch statement to handle different cases. The code compiles and runs, but the output is unexpected: 'A' prints when the input is 'B'. Which is the most likely cause?

A programmer wants to iterate over a list of strings and print each that starts with 'A'. Which loop construct is best suited?

A developer is writing a method to find the first occurrence of a negative number in an array and return its index, or -1 if none found. The current implementation uses a for loop with an if condition and a return when found. However, the method throws a NullPointerException when the array is null. The developer wants to handle this edge case gracefully and still return -1. Which approach is most appropriate?

Which THREE are valid loop constructs in Java? (Choose three.)

Arrange the steps to define a class with a main method in Java in the correct order.

Which THREE statements are true about the switch statement in Java? (Choose three.)

What is the output of the code? ```java for (int i = 0; i < 5; i++) { if (i == 2) { continue; } System.out.print(i + " "); } ```

Which THREE statements are true about the break and continue statements in Java? (Choose three.)

A novice developer wrote a condition: if (x = 10) { ... } What is the result?

Which three statements about the switch statement in Java are true?

Which TWO of the following are valid loop constructs in Java? (Choose two.)

Which TWO statements are true about the switch statement in Java? (Choose two.)

A developer is troubleshooting a performance issue in a reporting application. A nested loop iterates over a large dataset: the outer loop processes each row, and the inner loop performs a complex computation on each column. The application is taking longer than expected. Upon reviewing the code, the developer notices that the inner loop's termination condition is recalculated each iteration, which involves a costly method call. Which optimization should the developer implement to improve performance?

Which THREE of the following are valid loop constructs in Java?

A junior developer wrote a while loop that never terminates. What is the most likely cause?

A developer needs to iterate over a 2D array row by row and exit early if a specific value is found in any cell. Which nested loop structure with control statements is most efficient?

Match each Java operator to its description.

A developer writes: for(int i=0; i<10; i++) { if(i%2==0) continue; System.out.print(i); }. What is the output?

Consider a method that processes a two-dimensional array (matrix). It uses nested for loops. The inner loop uses a label 'outer' to break out of the outer loop. Under what condition is this label beneficial?

A team is implementing a search algorithm that iterates over an array of integers. The loop should stop as soon as the target value is found. Which loop construct is most appropriate?

Which loop best suits a scenario where the number of iterations is unknown and depends on user input?

Refer to the exhibit. What is the output?

A developer writes the following code: if (score >= 90) { grade = 'A'; } else if (score >= 80) { grade = 'B'; } else if (score >= 70) { grade = 'C'; } else { grade = 'D'; } What is the value of grade if score is 75?

What is the value of sum printed? int sum = 0; for (int i = 0; i < 3; i++) { sum = sum + i; } System.out.println(sum);

Which THREE of the following are valid types that can be used as a switch expression in Java (as of Java 8)?

A company's application uses a switch statement to handle different user roles. The code currently has a bug where after processing one role, it unintentionally executes the next role's logic. Which concept is being misused?

A developer implements a loop that processes a list of transactions. The loop must ensure that at least one transaction is processed even if the list is empty. Which loop construct guarantees this?

A developer is writing a batch processing application that reads a list of orders and processes each one. The orders are stored in an array of Order objects. The processing logic is complex and involves multiple conditional checks. The developer uses a for-each loop to iterate over the array. However, during testing, the application throws an IndexOutOfBoundsException when processing orders that have a status of "CANCELLED". The developer wants to skip the processing of cancelled orders but still record that the order was skipped in a log. The current code is: for (Order order : orders) { if (order.getStatus().equals("CANCELLED")) { // Skip } // process order process(order); log(order); } The developer considers four options: A. Change the for-each loop to a traditional for loop with an index and increment only when order is not cancelled. B. Add a continue statement inside the if block. C. Change the if condition to check for non-cancelled orders and wrap only the process(order) call inside the if block, leaving log(order) outside. D. Use a while loop with an iterator and remove cancelled orders from the array. Which option best solves the problem without modifying the array and while still logging all orders?

A developer needs to iterate over an array of integers and compute the sum of its elements. Which loop construct is most appropriate for this task?

In a nested loop structure, a developer wants to exit completely from the outer loop when a certain condition is met inside the inner loop. Which approach is correct?

What is the output of the program?

A developer writes a loop that iterates over an array of integers. The loop should stop when it encounters a negative number. Which control flow construct best achieves this?