Java Date, Calendar and Time: Exercises, Practice, Solution
Java Date, Time and Calendar Exercises [46 exercises with solution]
1. Write a Java program to create a Date object using the Calendar class. Go to the editor
2. Write a Java program to get and display information (year, month, day, hour, minute) of a default calendar. Go to the editor
3. Write a Java program to get the maximum value of the year, month, week, date from the current date of a default calendar. Go to the editor
4. Write a Java program to get the minimum value of year, month, week, date from the current date of a default calendar. Go to the editor
5. Write a Java program to get the current time in New York. Go to the editor
6. Write a Java program to get current full date and time. Go to the editor
7. Write a Java program to get the last day of the current month. Go to the editor
8. Write a Java program to get the last date of the month. Go to the editor
9. Write a Java program to calculate the first and last day of each week. Go to the editor
10. Write a Java program to get the name of the first and last day of a month. Go to the editor
11. Write a Java program to get the number of days of a month. Go to the editor
12. Write a Java program to get localized day-in-week name. Go to the editor
13. Write a Java program to get a day of the week of a specific date. Go to the editor
14. Write a Java program to get the current local time. Go to the editor
15. Write a Java program to add some hours to the current time. Go to the editor
16. Write a Java program to get a date after 2 weeks. Go to the editor
17. Write a Java program to get a date before and after 1 year compares to the current date. Go to the editor
18. Write a Java program to check a year is a leap year or not. Go to the editor
19. Write a Java program to get year and months between two dates. Go to the editor
20. Write a Java program to get current timestamp. Go to the editor
21. Write a Java program to get the current time in all the available time zones. Go to the editor
22. Write a Java program to get the dates 10 days before and after today. Go to the editor
23. Write a Java program to get the months remaining in the year. Go to the editor
24. Write a Java program to display the dates in the following formats. Go to the editor
Sample format :
Default format of LocalDate=2016-09-16 16::Sep::2016 Default format of LocalDateTime=2016-09-16T11:46:01.455 16::Sep::2016 11::46::01 Default format of Instant=2016-09-16T06:16:01.456Z Default format after parsing = 2014-04-27T21:39:48
25. Write a Java program to get the information of current/given year. Go to the editor
Sample format :
Sample Output : Current Year: 2001 Is current year leap year? false Length of the year: 365 days
26. Write a Java program to get the information of current/given month. Go to the editor
Sample format :
Sample Output : Integer value of the current month: 2 Length of the month: 28 Maximum length of the month: 29 First month of the Quarter: JANUARY
27. Write a Java program to get the information of a given time. Go to the editor
28. Write a Java program to display the date time information before some hours and minutes from current date time. Go to the editor
29. Write a Java program to convert a string to date. Go to the editor
30. Write a Java program to compute the difference between two dates (year, months, days). Go to the editor
31. Write a Java program to compute the difference between two dates (Hours, minutes, milli, seconds and nano). Go to the editor
32. Write a Java program to calculate your age. Go to the editor
33. Write a Java program to get the next and previous Friday. Go to the editor
34. Write a Java program to get today's date at midnight time. Go to the editor
35. Write a Java program to extract date, time from the date string. Go to the editor
36. Write a Java program to convert a unix timestamp to date in Java. Go to the editor
37. Write a Java program to find seconds since 1970. Go to the editor
38. Write a Java program to calculate the difference between two dates in days. Go to the editor
39. Write a java program to convert String to date and time and vice a versa. Go to the editor
40. Write a Java program to display current date without time and current time without date. Go to the editor
41. Write a Java program to display combine local date and time in a single object. Go to the editor
42. Write a Java program to define a period of time using date-based values (Period) and a duration of time using time-based values (Duration). Go to the editor
43. Write a Java program to display all the available time zones with UTC and GMT. Go to the editor
44. Write a Java program to define and extract zone offsets. Go to the editor
45. Write a Java program to print yyyy-MM-dd, HH:mm:ss, yyyy-MM-dd HH:mm:ss, E MMM yyyy HH:mm:ss.SSSZ and HH:mm:ss,Z, format pattern for date and time. Go to the editor
46. Write a Java program to count the number of days between two given years. Go to the editor
Java Code Editor
More to Come !
Do not submit any solution of the above exercises at here, if you want to contribute go to the appropriate exercise page.
Java: Tips of the Day
Why is (a*b != 0) faster than (a != 0 && b != 0) in Java?
if (a != 0 && b != 0)
will compile to 2 memory loads and two conditional branches
if (a * b != 0)
will compile to 2 memory loads, a multiply and one conditional branch.
The multiply is likely to be faster than the second conditional branch if the hardware-level branch prediction is ineffective. As you increase the ratio ... the branch prediction is becoming less effective.
The reason that conditional branches are slower is that they cause the instruction execution pipeline to stall. Branch prediction is about avoiding the stall by predicting which way the branch is going to go and speculatively choosing the next instruction based on that. If the prediction fails, there is a delay while the instruction for the other direction is loaded.
Ref: https://bit.ly/3ftdl2g
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