1. Abstract

2. boolean

3. break

4. byte

5. byValue

6. case

7. catch

8. char

9. class

10. const

11. continue

12. default

13. double

14. else

15. extend

16. false

17. final

18. finally

19. float

20. for

21. goto

22. if

23. implements

24. int

25. interface

26. long

27. native

28. new

29. null

30. package

31. private

32. protected

33. public

34. return

35. import

36. super

37. switch

38. synchronized

39. this

40. threadsafe

41. throw

42. transient

43. true

44. try

45. void

46. while

47. short 

 

Decimal numbers (base 10) are the ordinary numbers i.e. number having digits between 0 and 9. Example of decimal numbers: 109, 2821, 39038, 9827, 7098 etc.  

Octal numbers (base 8) are the numbers having digits between 0 and 7. For example, a decimal number 109 in octal notation can be written as 155 i.e. (109)10 is same as (155)8

Hexadecimal numbers (base 16) are the numbers that can be represented by 16 different digits. These digits are 0 to 9. In addition to these 10 digits, used by hexadecimal number system, six more alphabets are required. These six alphabets are represented by A to F. Alphabet 'A' is used to represent 10, 'B' to represent 11, 'C' to represent 12 and so on.

Unicode character set belongs to Unicode Worldwide character standard, which is a character coding system designed to support the interchange, processing and display of diverse languages of modern world. Unicode standard contains 38,885 distinct coded characters derived from 25 supported scripts. These characters cover the principle written languages of Europe, the Middle East, the Americas, Asia and Pacifica.