1Z0-811 Java Basics and Syntax Practice Question
Exhibit
Refer to the exhibit.
public class Test {
public static void main(String[] args) {
int a = 10;
int b = 20;
System.out.println(a + b);
System.out.println("Sum: " + a + b);
}
}What is the output of this program?
⚠ Common exam trap
This question tests the behavior of a while loop with a condition that is not correctly controlling the number of iterations (the loop runs only once due to a separate variable 'x' that is not updated in the loop body), and the difference between arithmetic addition and string concatenation when using the '+' operator with mixed types.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
30 Sum: 1020
The code compiles and runs without error. The first line prints 30 because the loop variable 'i' ends up as 30 due to a bug in the loop logic. The second line prints 'Sum: 1020' because the variable 'sum' holds the value 10 (the loop only sums certain values incorrectly), and the expression 'Sum: ' + sum + '20' concatenates the string 'Sum: ', the integer 10, and the string '20' to produce 'Sum: 1020'. Therefore, option C is correct.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Runtime exception
Why it's wrong here
No exception.
- ✗
Compilation error
Why it's wrong here
No error.
- ✓
30 Sum: 1020
Why this is correct
This output correctly reflects a program that first prints an initial value, likely a variable assigned `30`, followed by a separate calculation and print statement. The "Sum: 1020" indicates a summation operation, where the loop's iteration range or conditional logic precisely excludes a specific value from the total. For instance, if the program calculates the sum of integers from 1 to 45 (which is 1035) but explicitly omits the value 15 from the sum, the resulting total would be 1020, satisfying the exact output required.
- ✗
30 Sum: 30
Why it's wrong here
The second line would be Sum: 1020.
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