Test

Quick check

1. 1. What will the following code print? System.out.println("Hello, World!");

   Hello WorldHello, World!'Hello, World!'None of the above

2. 2. Which of the following is a correct way to declare a variable in Java?

   var x = 10;int x = 10;x = 10;declare x = 10;

3. 3. What is the correct way to create an object in Java?

   MyClass obj = new MyClass();MyClass obj = MyClass();new MyClass obj = MyClass();obj = new MyClass();

4. 4. What is the output of the following code? int x = 5; int y = 10; if (x > y) { System.out.println("x is greater than y"); } else { System.out.println("x is less than or equal to y"); }

   x is greater than yx is less than or equal to yErrorNo output

5. 5. Which of the following is an example of an array in Java?

   int[] numbers = {1, 2, 3, 4};int numbers = {1, 2, 3, 4};int numbers[] = (1, 2, 3, 4);int numbers = [1, 2, 3, 4];

6. 6. What will the following code snippet do? ArrayList<Integer> numbers = new ArrayList<>(); numbers.add(1); numbers.add(2); numbers.add(3); numbers.add(4); System.out.println(numbers);

   [1, 2, 3][1, 2, 3, 4]{1, 2, 3, 4}Error

7. 7. Which statement correctly uses a loop to print numbers 0 to 9?

   for (int i = 0; i < 10; i++) { System.out.println(i); }for (int i = 1; i <= 10; i++) { System.out.println(i); }while (i < 10) { System.out.println(i); i++; }do { System.out.println(i); i++; } while (i < 10);

8. 8. What does the following code do? for (int i = 0; i < 3; i++) { System.out.println(i); }

   Prints 1, 2, 3Prints 0, 1, 2Prints 0, 1, 2, 3Error

9. 9. How do you define a method in Java?

   function myMethod() { }void myMethod() { }def myMethod() { }method myMethod() { }

10. 10. What will the following code output? public static String greet(String name) { return "Hello, " + name; } public static void main(String[] args) { System.out.println(greet("Alice")); }

    Hello, nameHello, AliceAliceError

11. 11. Which of the following is NOT a valid way to create a String in Java?

    String s = "Hello";String s = new String("Hello");String s = 'Hello';char[] arr = {'H', 'e', 'l', 'l', 'o'}; String s = new String(arr);

12. 12. What is the result of 3 + "abc" in Java?

    3abcabc3Errorabcabcabc

13. 13. Which of the following is used to comment out multiple lines in Java?

    // Comment# Comment/* Comment */''' Comment '''

14. 14. What is the output of the following code? int x = 5; System.out.println(x > 3 && x < 10);

    truefalse5Error

15. 15. Which of the following is used to remove an item from an ArrayList by its index?

    list.remove(index);list.pop(index);list.delete(index);list.removeAt(index);

16. 16. What is the output of the following code? System.out.println(Math.pow(2, 3));

    68.089

17. 17. Which of the following is used to format strings in Java?

    String.format("Hello, %s", name);"Hello, " + name;String.format("Hello, {0}", name);All of the above

18. 18. What is the result of 10 / 3 in Java?

    33.03.333.3333333333333335

19. 19. Which of the following is used to get the length of an array in Java?

    array.length();array.size();array.length;sizeof(array);

20. 20. What is the output of the following code? System.out.println(Boolean.valueOf(false) + " " + Boolean.valueOf(true) + " " + Boolean.valueOf(""));

    false true falsefalse true truefalse true ErrorError