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Online Compiler
Write and run code without installing anything
Java, Python and SQL – straight in your browser. Free, no login, no limits. Useful when you are learning on a borrowed laptop, practising before an interview, or checking one line of logic without opening an IDE.
Java
Core Java, collections, strings and the coding programs asked in automation interviews. The language behind Selenium, TestNG and Rest Assured.
Python
Runs inside your browser – after the first load it even works offline. Good for Python basics, data handling and PyTest-style logic.
SQL
A real SQLite database with a sample QA schema already loaded – customers, orders, products, defects. Practise joins, grouping and subqueries on data that looks like a real project.
Why a tester needs these three
- Java – almost every automation interview has a coding round: reverse a string, find duplicates, second-highest number, collections questions.
- Python – the fastest language for test data, API scripts and AI testing work.
- SQL – asked in every QA interview, and used daily to verify what the screen shows against what the database stores.
Python and SQL run entirely inside your browser – nothing you type is sent to our server. Java runs on a compiler service, so it needs an internet connection.
Practice ideas
Java
- Reverse a string without
reverse() - Count duplicate characters with a HashMap
- Second highest number in an array
- Sort a list of objects with a Comparator
Python
- Read a list of test data and filter it
- Compare two dictionaries like an API response
- Generate 50 rows of fake test data
- Write a small assertion helper
SQL
- Customers with no orders (LEFT JOIN)
- Duplicate emails (GROUP BY … HAVING)
- Second highest order value
- Open defects by severity
Learning this with a trainer?
Java, Python and SQL are part of every automation program we run.