Java Programming Problem

All in one solution to learn.The best app for java programming problems and solution.
There are nice UI in this app.code style of this apps is familier.
------------------------------------------Features-------------------------------------
**Totally Offline
**48 problems
and Solution
**Very Simple UI & UX
------------------------------Problems and solution-----------
1. Hello World
2. Addition
3. Divisor
4. Small to Large
5. Leap Year
6. Cricket Run Rate
7. Largest Number
8. Prime Number
9. Multiplication Table
10. Find Factorial
11. Area of Circle
12. Area of Rectangle
13. Interest
14. Percentage
15. Swapping Two Number
16. Floyd Triangle
17. Pascal Triangle
18. Binary to Decimal
19. Decimal to Binary
20. Decimal to Hex
21. Decimal to Octal
22. Hex to Decimal
23. Palindrome String
24. String Change Case
25. String Length
26. String Compare
27. String Concat
28. String Reverse
29. String Trim
30. Vowel Remove
31. Reverse String Array
32. Sort String Array
33. String to Char Array
34. Char Array to String
35. Average Array
36. Array Copy
37. 2D Array Example
38. Matrix Multiplication
39. Matrix Transpose
40. Interface Example
41. Binary Search
42. Bubble Sort
43. Create File
44. Create Directory
45. Date and Time
46. Date to String
47. Open Notepad
48. Display IP Address