| 1. | Display the total amount of memory in the Java virtual machine. | | |
| 2. | Display the maximum amount of memory | | |
| 3. | Display the amount of free memory in the Java Virtual Machine. | | |
| 4. | Round number to fewer decimals | | |
| 5. | Display numbers with commas | | |
| 6. | Change the decimal separator is set to "." | | |
| 7. | Display numbers in scientific notation | | |
| 8. | Use java.text.DecimalFormat to format integer | | |
| 9. | new DecimalFormat("0.######E0") | | |
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| 10. | Use new DecimalFormat("0.#####E0") to format double | | |
| 11. | new DecimalFormat("000000E0") | | |
| 12. | Display numbers with leading zeroes | | |
| 13. | Display a percentage | | |
| 14. | Display a currency value | | |
| 15. | new DecimalFormat(abc#) | | |
| 16. | DecimalFormat("00E00") | | |
| 17. | DecimalFormat("000E00") | | |
| 18. | DecimalFormat("0000000000E0") | | |
| 19. | new DecimalFormat("0.00") | | |
| 20. | new DecimalFormat("#.#") | | |
| 21. | new DecimalFormat("#.######") (1) | | |
| 22. | new DecimalFormat("#.000000") | | |
| 23. | new DecimalFormat(".######") (2) | | |
| 24. | new DecimalFormat("#,###,###") (grouping) | | |
| 25. | new DecimalFormat("##00") | | |
| 26. | Convert a number using the current Locale() | | |
| 27. | The 0 symbol shows a digit or 0 if no digit present | | |
| 28. | Use group separators and show trailing zeroes | | |
| 29. | Force minimum number of digits to left and right of decimal point | | |
| 30. | Set format to two decimal places: set Minimum Fraction Digits | | |
| 31. | Set format to two decimal places: set Maximum Fraction Digits | | |
| 32. | The . symbol indicates the decimal point | | |
| 33. | The , symbol is used to group numbers | | |
| 34. | The ; symbol is used to specify an alternate pattern for negative values | | |
| 35. | The ' symbol is used to quote literal symbols | | |
| 36. | DecimalFormat("00.00E0") | | |
| 37. | The number of #'s to the left of the decimal point sets the multiple of the exponent. | | |
| 38. | DecimalFormat("##E0") (exponent must be multiple of 2) | | |
| 39. | DecimalFormat("###E0") (exponent must be multiple of 3) | | |
| 40. | Extracts a decimal digit from a number | | |