Tag: programming languages

Questions Related to programming languages

Given: 1. class Zippy { 2. String[] x; 3. int[] a [] = {{1,2}, {l}}; 4. Object c = new long [4] ; 5. Object[] d = x; 6. } What is the result?

  1. Compilation succeeds.

  2. Compilation fails due only to an error on line 3

  3. Compilation fails due only to an error on line 4

  4. Compilation fails due only to an error on line 5

  5. Compilation fails due to errors on lines 3 and 5

  6. Compilation fails due to errors on lines 3, 4, and 5


Correct Option: A

AI Explanation

To answer this question, let's go through each option to understand why it is correct or incorrect:

Option A) Compilation succeeds - This option is correct because there are no syntax errors in the code provided.

Option B) Compilation fails due only to an error on line 3 - This option is incorrect. Line 3 initializes a two-dimensional int array a[][] with values {{1,2}, {l}}. The l is likely a typo and should be replaced with a valid integer value. However, this error does not cause compilation to fail.

Option C) Compilation fails due only to an error on line 4 - This option is incorrect. Line 4 declares an Object variable c and initializes it with a long array. This is a valid assignment, and compilation does not fail due to this line.

Option D) Compilation fails due only to an error on line 5 - This option is incorrect. Line 5 declares an Object array d and assigns it the value of x, which is a String array. This is a valid assignment, and compilation does not fail due to this line.

Option E) Compilation fails due to errors on lines 3 and 5 - This option is incorrect. As explained above, the errors on lines 3 and 5 do not cause compilation to fail.

Option F) Compilation fails due to errors on lines 3, 4, and 5 - This option is incorrect. As explained above, the errors on lines 3, 4, and 5 do not cause compilation to fail.

The correct answer is A) Compilation succeeds. This option is correct because there are no syntax errors in the provided code.

  1. true true

  2. false true

  3. true false

  4. false false

  5. Compilation fails.

  6. An exception is thrown at runtime


Correct Option: A
Explanation:

Explanation: Let's go through the code step by step to understand the result.

  1. We have a class called "Fizz" with an instance variable "x" initialized to 5.

  2. In the main method, we create two instances of the "Fizz" class - f1 and f2.

  3. We then call the static method "FizzSwitch" passing f1 and f2 as arguments. In this method, we declare a final variable "z" and assign it the value of "x" (which is f1).

  4. Next, we modify the value of "x" using the "z" reference. Therefore, the value of "x" in f1 is changed to 6.

  5. Finally, we return the reference "z" (which is f1) and assign it to the variable "f3".

  6. In the println statement, we compare if f1 and f3 are the same object reference (f1 == f3) and if their instance variable "x" is the same (f1.x == f3.x).

Now let's analyze the options:

Option A) true true - This option is correct because f1 and f3 refer to the same object, and the value of "x" in both objects is 6.

Option B) false true - This option is incorrect because f1 and f3 refer to the same object, so f1 == f3 should be true.

Option C) true false - This option is incorrect because f1 and f3 refer to the same object, so f1 == f3 should be true.

Option D) false false - This option is incorrect because f1 and f3 refer to the same object, so f1 == f3 should be true.

Option E) Compilation fails - The code does not have any compilation errors, so this option is incorrect.

Option F) An exception is thrown at runtime - The code does not have any exceptional behavior, so this option is incorrect.

The correct answer is option A) true true. This option is correct because f1 and f3 refer to the same object, and the value of "x" in both objects is 6.

Therefore, the result of the code is "true true".

The correct answer is option A.

  1. One of them will compile, only one will be true.

  2. Two of them will compile, only one will be true.

  3. Two of them will compile, two will be true.

  4. Three of them will compile, only one will be true

  5. Three of them will compile, exactly two will be true.

  6. Three of them will compile, exactly three will be true.


Correct Option: D

Given: public class MyOuter { public static class MyInner { public static void foot) { } } } Which, if placed in a class other than MyOuter or MyInner, instantiates an instance of the nested class?

  1. MyOuter.MyInner m = new MyOuter.Mylnner();

  2. MyOuter.MyInner mi = new MyInner();

  3. MyOuter m = new Myouter(); MyOuter.MyInner mi = m.new Myouter.MyInner();

  4. MyInner mi = new MyOuter.MyInner();


Correct Option: A