1Z0-829 Controlling Program Flow Practice Question
A junior developer writes a method that uses a switch statement to handle different types of user input. The input is an integer representing an operation code. The developer uses a traditional switch statement with break statements. However, when operation code 2 is entered, the program also executes the code for operation 3. What is the most likely cause?
⚠ Common exam trap
Many candidates think fall-through is always intentional or that operation codes must be mutually exclusive, but the question explicitly describes an unintended execution pattern, which points directly to a missing break statement.
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
✓
The break statement is missing after the operation 2 case.
In a traditional Java switch statement, execution continues into the next case block unless a break statement is encountered. If operation code 2 executes the code for operation 3, it indicates that the break statement is missing after the case for operation 2, causing fall-through to the next case.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
The break statement is missing after the operation 2 case.
Why this is correct
Missing break causes fall-through to subsequent cases.
- ✗
The operation codes are not mutually exclusive.
Why it's wrong here
Operation codes are independent integers.
- ✗
The variable is being modified inside the switch.
Why it's wrong here
Modifying the variable would not cause execution of another case.
- ✗
The switch statement uses fall-through by design.
Why it's wrong here
Fall-through is not intended if break statements are expected.
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