Java Loops Coding Questions and Answers

Welcome to the Java Loops Coding Quiz. In this quiz, we present 10 coding MCQ questions to test your coding knowledge on the Java Loops (for loop, while loop, do-while-loop) topic. Each question has a correct and brief explanation.

1. What is the output of the following Java code snippet?

for (int i = 0; i < 5; i++) {
    if (i == 2) {
        break;
    }
    System.out.print(i + " ");
}

a) 0 1

b) 0 1 2

c) 0 1 2 3 4

d) 0 1 3 4

Answer:

a) 0 1

Explanation:

The break statement exits the loop when i equals 2. Thus, only 0 and 1 are printed.

2. What does this Java code snippet output?

int i = 0;
while (i < 3) {
    System.out.print(i + " ");
    i++;
}

a) 0 1 2

b) 0 1 2 3

c) 1 2 3

d) An infinite loop

Answer:

a) 0 1 2

Explanation:

The loop prints i and increments it each time until i is less than 3.

3. Identify the output of the following code:

int count = 0;
do {
    count++;
} while (count < 3);
System.out.println(count);

a) 2

b) 3

c) 4

d) An infinite loop

Answer:

b) 3

Explanation:

The do-while loop increments count until it is less than 3. It stops when count becomes 3.

4. What will be printed by this Java code?

for (int i = 0; i < 5; i++) {
    if (i % 2 == 0) {
        continue;
    }
    System.out.print(i + " ");
}

a) 0 2 4

b) 1 3

c) 1 3 4

d) 0 1 2 3 4

Answer:

b) 1 3

Explanation:

The continue statement skips the current iteration of the loop when i is even. Thus, only the odd numbers 1 and 3 are printed.

5. What does this code snippet output?

int i = 1;
while (i <= 5) {
    System.out.print(i + " ");
    i++;
}

a) 1 2 3 4 5

b) 1 2 3 4

c) 2 3 4 5

d) An infinite loop

Answer:

a) 1 2 3 4 5

Explanation:

The while loop iterates as long as i is less than or equal to 5, printing numbers from 1 to 5.

6. What is the result of executing this code?

int sum = 0;
for (int i = 0; i <= 4; i++) {
    sum += i;
}
System.out.println(sum);

a) 6

b) 10

c) 14

d) 20

Answer:

b) 10

Explanation:

The for loop calculates the sum of numbers from 0 to 4, resulting in 10.

7. What will the following Java code snippet output?

for (int i = 0; i < 3; i++) {
    for (int j = 0; j < 3; j++) {
        if (i == j) {
            break;
        }
        System.out.print(i + "" + j + " ");
    }
}

a) 01 02 10 12 20 21

b) 00 11 22

c) 01 10 12 20 21

d) 01 10 20

Answer:

c) 01 10 12 20 21

Explanation:

The break statement exits the inner loop when i equals j. It results in pairs where i is not equal to j.

8. What does the following code snippet print?

int i = 5;
while (i > 0) {
    i--;
    if (i == 2) {
        continue;
    }
    System.out.print(i + " ");
}

a) 4 3 1 0

b) 4 2 1 0

c) 4 3 2 1

d) 4 3 1

Answer:

d) 4 3 1

Explanation:

The continue statement skips the print statement when i is 2. The loop prints 4, 3, 1, and then 0.

9. Determine the output of this Java code:

int x = 0;
for (int i = 10; i > 0; i--) {
    x += i;
}
System.out.println(x);

a) 45

b) 55

c) 60

d) 100

Answer:

b) 55

Explanation:

The for loop adds the numbers from 10 to 1, resulting in a total of 55.

10. What is the result of the following code snippet?

int i = 0;
do {
    i++;
    if (i == 4) {
        break;
    }
} while (i < 7);
System.out.println(i);

a) 3

b) 4

c) 7

d) An infinite loop

Answer:

b) 4

Explanation:

The do-while loop increments i until it reaches 4, where the break statement exits the loop.