List the visits, then mark which statements actually run.
Review bounded loops, while termination, continue, break, switch expressions and indexed array updates.
The count records matching keys among these six selected Java 25 tasks. It is not a developer level, percentile, hiring cutoff or qualification. Every explanation and this full revision guide remain available at every count.
Six small control-flow traces
These tasks use single-threaded Java 25 programs with explicitly bounded data. They ask which iterations run, what a branch skips and what values remain afterwards. The section covers an even-value selection, a decreasing while loop, continue, break, a switch expression and a zero-based array update. None depends on thread scheduling, input files or an unspecified iteration order. That narrow setup makes an output check possible, rather than claiming to assess every real-world control-flow problem.
Make a three-column trace table
For a fresh example, start total at zero and iterate i from one through five, skipping i=3 before adding. Record i, whether the addition runs and the resulting total. The sequence of totals after additions is one, three, seven and twelve. Writing down the skipped visit stops you from confusing continue with break. This example changes the numbers and the skipped value from the scored bank; it is revision material, not another scored question.
Separate the condition from the update
For a while loop, test the condition before entering the body and record how the body changes the next test. For a basic for loop, distinguish initialization, condition, body and update. An exclusive array bound i<values.length permits the final valid index length-1 and does not permit length. Do not decide how many additions occurred merely from the initial and final counter values; a conditional branch can skip an addition while the counter still advances.
Locate the transfer before changing state
Continue skips the rest of the current body, while break exits its target loop or switch. Their placement relative to an update matters. Arrow arms in the supplied switch expression select a result without the fall-through behaviour associated with an unbroken traditional colon-style group. Read the actual syntax rather than borrowing a rule from a different construct. These are code-reading distinctions, not advice to use jumps everywhere or avoid them in every application.
Predict the trace before asking the compiler
Create a disposable program with four or five invented values. Write a trace table before running it, then compare every visited index and final printed output. Change only an inclusive boundary to an exclusive one, or move one addition across a branch check, and predict again. Keep an execution limit when experimenting with a loop so that an accidental non-terminating condition is easy to stop. This practice site itself does not execute visitor-provided code.
Review where your trace first diverged
When a count is lower than you expected, find the first row at which your predicted trace differs from the worked explanation. Was the upper boundary excluded, the increment still executed after continue, or a break reached before the addition? Naming that first divergence gives you a manageable new exercise. Six correct choices cannot demonstrate debugging a long-running service, and a missed boundary in one supplied example does not establish a permanent programming weakness.
Counts stay tied to this fixed edition
Every selected answer, correct option and explanation is available after all 24 valid choices, together with all four complete guides at every count. This six-task section has no calibrated beginner-to-expert bands, hiring threshold, speed bonus or certificate. The Java 25 snippets were compiler and runtime checked, but that does not validate a broad developer-ability scale. Repeating the same edition after studying its answers can reflect recognition and memory; use a fresh trace to explore whether the distinction transfers.