Java Practice

Every lesson runs in your browser — write real code, press Run, and the tasks check themselves. Free, no account needed, with translated notes paired with English.

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Lessons in this course

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1. 01 Print a word 1 required task · ★
2. 02 Print another word 1 required task · ★
3. 03 Print a sentence 1 required task · ★
4. 04 Print with a ! 1 required task · ★
5. 05 Print two lines 1 required task · ★
6. 06 Print a number 1 required task · ★
7. 07 Add two numbers 1 required task · ★
8. 08 Subtract 1 required task · ★
9. 09 Multiply 1 required task · ★
10. 10 Divide 1 required task · ★
11. 11 Remainder 1 required task · ★
12. 12 A number variable 1 required task · ★
13. 13 A text variable 1 required task · ★
14. 14 Add two variables 1 required task · ★
15. 15 Your first method 1 required task · ★
16. 16 Is it positive? 1 required task · ★
17. 17 Cube a number 1 required task · ★
18. 18 The smaller one 1 required task · ★
19. 19 Square a number 1 required task · ★
20. 20 Largest of three 1 required task · ★
21. 21 Count the vowels 1 required task · ★★
22. 22 Reverse the word order 1 required task · ★★
23. 23 Palindrome check 1 required task · ★★★
24. 24 Running sum 1 required task · ★★★
25. 25 Most frequent character 1 required task · ★★★
26. 26 Binary search 1 required task · ★★★
27. 27 Factorial (mind the size) 1 required task · ★★★★
28. 28 Count primes below n 1 required task · ★★★★
29. 29 Roman numerals 1 required task · ★★★★★
30. 30 Longest common prefix 1 required task · ★★★★★

Language reference

/know/reference/java