AnalyzePrograms

JavaFX desktop app for benchmarking small Java programs.

Paste Java code, choose input, run it, and inspect the numbers. The app compiles the pasted code with javac, runs it once to capture output, then benchmarks the program's main method with JMH.

It does not prove Big-O. It gives measurements so you can compare how the same program behaves as input grows.

What It Measures

• Execution time.
• Memory usage.
• Throughput: operations per second.
• GC pause time.
• Heap allocation rate.
• Latency percentiles: p50, p95, and p99.

Code Requirements

The pasted program should:

• Use a public class.
• Use public static void main(String[] args).
• Avoid a package declaration. The runner expects the public class directly on the temporary classpath.
• Print something with System.out.print, System.out.println, System.out.printf, or the same methods on System.err. The UI uses this to make output capture explicit.

The app is best for self-contained algorithm snippets, not full projects with build tools, external libraries, files, networking, or long-running services.

Input Modes

Single Input

Runs one benchmark point.

Data sources:

• Manual Input: paste the exact stdin your program expects.
• Random Input: generate stdin from simple Scanner patterns.
• Hardcoded Input: use data already inside the code. This mode rejects code that still reads from Scanner.

Input Range

Runs the same program across multiple generated input sizes. This is the mode that enables graphs.

You provide:

• Min size.
• Max size.
• Step size.
• Array type: random, sorted, or nearly sorted.

The max generated size is 100000 (FOR NOW).

Random Input Rules

Random generation is heuristic. It handles simple Scanner programs, including:

• nextInt() / nextDouble() numeric input.
• Common array-style input where the first number is the size.
• Simple matrix input.
• Single nextLine() string input.

For custom formats, use Manual Input. Do not fight the generator.

Input And Output Windows

The app stores the exact input used for the latest run and the output captured from the verification run.

Graphs

Graphs are only available after Input Range analysis, because one input size is not a trend.

Each graph window can show/hide data points, show/hide grid lines, export CSV data, reset zoom, pan, and zoom.

FAQ Window

The in-app FAQ explains the supported input formats and common failure cases.